Joined Jul 27, 2006 Messages 2,634. Units of measurement can vary, but inches of Mercury (Hg) seems to be most accepted. Summer is comming here, so I will be getting the boat out soon to start working on it. In actuality, both elements would be under .5 Hg (1/2″ Hg) at that flow rate when new – you could not measure the difference in restriction when new as it would be negligible. Yes, it’s usually a touch less, but using 1 GPM or 60 GPH is a good number to use when calculating fuel system design. But there is a little more to it than that. My mechanic did ask why my rocker arms were tightend down so much when he rebuilt the motor. This Fuel Line Assembly Replaces OEM PN: 398549 & 176748. 5/16'' 8mm Fuel Line Assembly, 10ft Fuel Hose Line Fit for Yamaha Outboard Marine Boat Motor, Fuel Gas Hose Line Assembly, Rubber In closing, remember that you not only have to think “fuel filters” when pondering your fuel supply system design if trying to keep “restriction” at the minimum.. We have rigid hardwall fuel hose, boat fuel line assemblies, heavy duty marine fuel line, wire reinforced marine fuel hose, corrugated wire reinforced fuel fill hose, and more from brands like MPI, Attwood, and Bombardier. A couple of hours tuning could really help you. Although not part of the fuel supply system after the tanks, this was a fuel fill hose on a 46 Bertram we re-powered. Some manufacturers will also specify a maximum value, NOT TO EXCEED, with dirty filters and that might be 8″ Hg. Fittings and selector valves with small internal passageways and/or convoluted hose routings increase the reading. $33.01 - $53.69. Need help selecting? Not sure on BBC for timing but I would set that with 3000RPM and most idle at 1000-1200 out of the water. Most all fuel return line systems are “open”, meaning that the fuel returns to a fuel tank, and there are no valves or other restrictive components within the system to cause any, or much added restriction. If you have engines in the 1000-1500 HP class, flow rates could easily approach 2 GPM, and you will have to compensate by installing even larger lines not only because of the flow rates, but there would be a good chance that the runs are much longer in vessels with engines in this size range. Smaller boats that range in size from thirty to forty feet will typically offer options for both gas engines and diesel engines: Diesel tends to be more expensive both in terms of the motor and the fuel itself. Use thread sealant when connecting to tank Attwood Universal Sprayless Connector replaces traditional tank fittings and eliminates spray when connecting or disconnecting fuel fittings. Honda O/B Platinum Fuel Line Assembly, Quick Connect, Female w/Rectangular Post, 6' x 3/8" From BoatUS Magazine, America's Most-Trusted Boating Magazine. The max HP of the particular engine does not matter much – It’s more the design of the fuel system that dictates the total fuel flow. 14, Vulkan Vulkardan-E Coupling (2K4011S041) SAE No. This ensures gravity feeds fuel to the pump. Has newer Mallory Unilite distributer, and Taylor 8mm wires. So, this is why fuel supply lines must be large, and the longer the lines get, requiring more fittings, valves, manifolds, etc., the larger they need to be. Ultra-low restriction Multi-Stage “FUELTRATION” system for those who want the ultimate in delivering the cleanest possible of fuel to their engine while monitoring filter loading on an individual basis – Continuous flows to 100 GPH are no issue with this system and dealing with old dirty tanks is a cake walk, while offering simple and low maintenance intervals for the vessel operator Also Mates to Larand Tank Outlet: L-7410 The ½” line will result in a ½ pound drop versus the 3 pound drop for the 3/8” line at the stated flow of 83.3 gph (enough to support 1000 HP at a BSFC of.5). Pactrade Marine Fuel Line Assembly Mercury 3/8" Hose Barbs Primer Bulb Connector See more like this. Anyone know what size carburetor fuel line hose my 1985 Bayliner Capri 85hp Force Motor takes? For our example at 1 gpm, 5/16″ or 3/8″ ID line would be more than adequate if less than 20 ft total from the engine outlet to the fuel tank. In this case, and most any 250-450 HP 6 cylinder diesel that uses an ND EP-9 type or Bosch P7100 fuel injection pump (or a system of similar design), just assume the fuel flow is about 1 GPM. We recommend you install a 100 Micron In-Line Fuel Filter between the tank and the pump. One, the maximum allowed value for the pressure drop is usually 2-4 times more and the return flow is always less (at least to some extent) than the total fuel flow. Oftentimes the argument is made against fitting a fuel/water separator on a boat if it has removable fuel tanks. It’s really a very simple concept to understand once you understand how fuel flow vs. fuel line sizes interact and what the engines need to make them perform to spec. The fuel line hoses are the standard 18 inches to the tank and 54 inches to the engine. A car engine, or a boat engine rebuilt by a car shop, in a jet boat will usually only run 45-50 mph. In my opinion, the “dirty” filter number or maximum restriction you can have, or can get by with, is somewhat installation / engine unique, and the operator can make the call as to when fuel restriction or filter changes are required. It is my humble opinion (and I like the sound of my own voice, "Life's journey is not to arrive at the grave safely in a well preserved body, but rather to skid in sideways totally worn out shouting 'Holy Shit what a ride!" Brand New. The Best Universal Fuel Line Assembly Kit with Tank Fitting (Johnson/Evinrude, Mercury, Yamaha) … A simple and low restriction manifold system using large full-flow valves and 1/2″ ID lines for a 2 x 300 HP engines and 1 x 30 Kw gen set that was done by the owner with a touch of guidance By the time the restriction number climbs to about 10″ hg, it’s typically time for a filter change. It includes our high quality primer bulb, premium A1 hoses and the engine and tank connectors. Just wondering and the boat I bought just has the vehicle fuel line in it. The fuel line after the pump can be the next smaller size. Filter By Category. Units of measurement can vary, but inches of Mercury (Hg) seems to be most accepted. The It's pretty old, so no markings on it. (External pumps push fuel. He asked if I was doing it as a rev limiter. Universal Fuel Line Assembly 6FT Marine Boat Motor Fuel Gas Hose Line Assembly Features: Made of steel and plastic material, Long service time and durable to use. Have you done a tune up....all filters, plugs, wires, cap/rotor/dizzy, carb...ect. This is an EPA – CARB Compliant FUEL LINE ASSEMBLY & Made in the USA! Since 1968, West Marine has grown to over 250 local stores, with knowledgeable Associates happy to assist. Eastern Marine sells OE compatible outboard motor fuel line and tank fittings for Mercury, Mariner, Johnson, Evinrude, Yamaha, and Honda boat motors. Wherever you are, find an engine guy that is willing to help you with the basics. Boat Fuel Hoses. Just about everybody seems to equate fuel restriction with the fuel filtration system and it’s design, and never thinks about the fuel line as being a major factor in this equation, even when all is new and clean. Yes, the 2 mic will load quicker (get dirty) and the restriction would rise faster, but isn’t that what it should do? Items 1-12 of 54. Marine hose is rated for 40 psi and will work in a … When looking at the fuel return system, we can use smaller lines for two reasons. Shields Hose® 368 Series Type A2 Fuel Line. Those silver "marine" fuel lines are garbage. All fuel line assemblies use a compounded, tough and pliable UV-resistant hose that promotes maximum fuel flow. Boat fuel lines and hoses in any boat’s fuel systems are essential in ensuring safe boat operation and trouble-free performance. They don't pull it very well.) Boat Accessories Australia has a great range of fuel line connectors for any application from brands like Mercury, Honda, Suzuki, Yamaha, Nissan-Tohatsu, OMC and more. I'll be getting it out soon, and have more info. 14, ZF Transmission Adapter Plate SAE#3 for 45A, 63A, 63IV, ZF Transmission Adapter Plate SAE#3 for 80A, 85A, 85IV, ZF Transmission Adapter Plate SAE#3 for ZF 220A, ZF Transmission Adapter Plate SAE#3 CAT Engine for ZF 220A, ZF Transmission Adapter Plate SAE#3 for ZF 280A/IV, ZF Transmission Adapter Plate SAE#3 for ZF 285A/IV & ZF 286A/IV, Transmission Adapter Plate to Bellhousing Bolt Hardware Kit, SMX Transmission Spacer for Borg Warner Velvet Drive, ZF Marine Mechanical ATF Series Shift & Troll Valve, ZF Marine Electronic ATF Series Shift & Troll Valve, ZF Marine Electric EB15 Shift Valve with Trolling Valve, ZF Marine Mechanical Trolling Valve (ZF 280+), ZF 220 Marine Mechanical Trolling Valve Kit, ZF ATF 63 A/IV 85 A/IV Electronic Progressive Shift Solenoid, ZF ATF 63 A/IV 85 A/IV Electronic Shift Solenoid, ZF EB15 Electronic Shift Solenoid (TROLL), ZF EB30/31 Electronic Shift Solenoid Coil, ZF ATF 63 A/IV 85 A/IV Electronic Troll Valve Coil, ZF Electronic Shift Solenoid Wire Plug/Cap, SMX Marine Transmission Drop in Screen Filter 45/63/68/80/85 A/IV Series “ATF”, Fleetguard LF701 Lube Filter for ZF Gears, Genuine ZF Marine Oil Filter Transmission (3213308019), ZF Marine 25A, 45A, 63A/IV, 80A/IV Input Shaft Seal, ZF Marine 63IV Inner (Small) Output Shaft Seal, ZF Marine 63IV Outer (Large) Output Shaft Seal, ZF Marine 80IV/85IV Inner (Small) Output Shaft Seal, ZF Marine 80IV/85IV Outer (Large) Output Shaft Seal, ZF 63A/IV 68A/IV 80A 85A SMX Marine Transmission Mounting Brackets, ZF 85IV SMX Marine Transmission Mounting Brackets, ZF 220A SMX Marine Transmission Mounting Brackets, ZF 280A & ZF 280-1 SMX Marine Transmission Mounting Brackets, ZF Marine 220 / 220A Replacement Oil Pump, ZF Marine 286A / 286IV Replacement Oil Pump, Cummins Marine Engine Warranty Information, Marine 316L SS 4 inch Pipe (4.5″ OD) 90 Degree Elbow, Understanding Fuel Line Sizes vs. Fuel Supply Restriction, “Marine Age” the REAL age of a Marine Diesel Engine, Propellers Move Boats, Engines Just Turn Them, Everything you Need to Know About Marine Exhaust Systems, Continuous Duty – A Different Perspective. Inside the ½” fuel line the fuel would be traveling at 2 ft/second and inside the 3/8″ fuel line just over 3 ft per second. This would be about normal. Do you have a rev limiter, fuel gauge, A impeller..... No rev limiter, no fuel pressure gauge, do have A impeller. If the line is not in an enclosed area, like on an inboard engine, just buy both connectors, a primer, and the right length of regular black fuel line … A perfect example of this is when a typical owner thinks that a 2mic filter is more restrictive than a 10 mic filter of the same size (like a Racor 1000 element at 2 mic or 10 mic, both new, at a flow rate of 1 GPM. Some may come from an inline return fuel cooler (not much if they are sized right) and friction inside the fuel line with fuel flowing thru it, which brings us to what this discussion is about – Fuel Line Restriction, and how it interacts or affects overall fuel restriction on both the supply and the return fuel system on a diesel engine. When using E85, alcohol, methanol, etc. 429531 $39.87. Regardless of the units of measure used, fuel restriction values need to be very low, and in a general sense, the lower the better when the system is fresh or new as this gives the operator more time between filter maintenance. Fuel supply restriction or “pressure drop” is always measured as a negative number because it is on the suction side of the fuel lift or supply pump. Next, we need to know the factory’s maximum values, numbers, or pressure drops that the engine can tolerate to work properly for both the supply side (suction) and the return side (restriction-pressure of the return line). Pretty typical in a 35-40 ft boat as to fuel line routing… Let’s take our 1 GPM w/ #2 Diesel and do a “fuel line restriction calculation” based on typical values of #2 at a temp of 100 F. I’ll use a specific gravity of .85 and a viscosity of 3.0 centipoises (these would be reasonable numbers). We’ve been serving local Ventura County, California since 1980 as a custom boat builder, repower specialist, designer, and supplier of equipment to builders, commercial fishermen, and recreational users. Yes, the 2 mic will load quicker (get dirty) and the restriction would rise faster, but isn’t that what it should do? Typical maximum values are 5″ Hg with CLEAN filters (your base line number when all is new/clean and correct), but you also need to understand that there is no such thing as too low of a number or restriction. All fittings are built to OEM specifications for replacement parts. Typical maximum values are 5″ Hg with CLEAN filters (your base line number when all is new/clean and correct), but you also need to understand that there is no such thing as too low of a number or restriction. Custom manifold is gravity fed with 1.25″ ID hose from the forward main fuel tank 30 feet forward of the engines. ---Crewcheif22 AKA Keith. The picture shows what a full fuel line assembly looks like. A healthy fuel system normally indicates about 2.5" to 3.5" Hg at full flow. 16" 3/8 NPT Fuel Line. Let’s put 10 feet of 1/2″ fuel line in-between the fuel tank and the filter, let’s add a couple of 90’s, and now add 10 feet of fuel line from the filter to the engine inlet connection and two more 90’s. Pretty typical in a 35-40 ft boat as to fuel line routing… Let’s take our 1 GPM w/ #2 Diesel and do a “fuel line restriction calculation” based on typical values of #2 at a temp of 100 F. I’ll use a specific gravity of .85 and a viscosity of 3.0 centipoises (these would be reasonable numbers). Under load in water your rpm will drop about 200rpm. For filling and maintaining your boat’s fuel tank systems, turn to the professionals at Wholesale Marine. Jul 11, 2013 #3 Re: fuel line size. Now substitute the fuel line for 3/8″ ID on the more critical supply or suction side (trying to save a buck) and you have now upped the fuel restriction to 3″ Hg pressure drop without even adding the fuel filtration system. It also typically produces a louder engine that … Comes with high quality rubber bulb, built in check valve. Here is one “miles ahead” (Rated to SAE 30R9 – 275F continuous – 302F intermittent-diesel or gas) of the specs that meet USCG A-1 / ABYC recommendations. View as Grid List. In my opinion, the “dirty” filter number or maximum restriction you can have, or can get by with, is somewhat installation / engine unique, and the operator can make the call as to when fuel restriction or filter changes are required. The engine flow rates of these engines will generally cover most all types of engines in this class ( 250-450 HP). Fuel gauge is the first thing I will do. Because of the popularity the 6 cylinder 6BTA or 6CTA Cummins (not that it really matters), we’ll use these engines as a basis for this discussion. Go. One, the maximum allowed value for the pressure drop is usually 2-4 times more and the return flow is always less (at least to some extent) than the total fuel flow. But, here is what all seem to not realize. This would be about normal. Find the right diameter and construction for your needs from our selection of low permeation hose for gasoline, diesel and gas/alcohol blends. Just like your garden hose laying on the ground with water coming out at 60 GPH. Very old fuel manifold system done a mix of iron and brass fittings. Although kind ugly and a touch complex, it was low on restriction because of ample sizing (mostly 3/4″ pipe size) of all the fittings & hose sizes Marine hose must have the SAE J1527 Style R1 rating emblazoned on the hose to pass as seaworthy. I ran -10 lines and then -8 lines to the bowls. Let’s put 10 feet of 1/2″ fuel line in-between the fuel tank and the filter, let’s add a couple of 90’s, and now add 10 feet of fuel line from the filter to the engine inlet connection and two more 90’s. I think it was time So a -10 would be 10 mm, -20 twenty mm, and so on? Marine fuel hose is a different product than standard fuel hose and has to be Coast Guard approved. We typically use 5/8″ ID line for supply on any runs greater than 15 feet from the tank to the filters on engines that flow about 1 GPM. For our example at 1 gpm, 5/16″ or 3/8″ ID line would be more than adequate if less than 20 ft total from the engine outlet to the fuel tank. We carry an extensive line of boat gas tanks from leading manufacturers for both inboard and outboard engine fuel tank systems. Just about everybody seems to equate fuel restriction with the fuel filtration system and it’s design, and never thinks about the fuel line as being a major factor in this equation, even when all is new and clean. We get it. I would get a fuel gauge...that way you know. 99 Shop with confidence - get free shipping to home or stores + price match guarantee! 4.3L/262ci Low Pressure Fuel Pump to Carburetor Fuel Line. Thanks He had used 1/2″ ID fuel line for all but forgot about his “old” pick-up tubes. Tell me more about Fuel Tanks and Accessories. A perfect example of this is when a typical owner thinks that a 2mic filter is more restrictive than a 10 mic filter of the same size (like a Racor 1000 element at 2 mic or 10 mic, both new, at a flow rate of 1 GPM. Compatible with all fuel tanks with standard 1/4" NPT output. Johnson / Evinrude / OMC / Bombardier Fuel Line Assembly. Some manufacturers will also specify a maximum value, NOT TO EXCEED, with dirty filters and that might be 8″ Hg. But, here is what all seem to not realize. Top rpm is about 47-4800, and it just feels like the motor has more in it, but just can't rev up any more. High-quality fuel assembly components must be securely attached to prevent potentially dangerous fuel line leaks. It offers superior resistance to U/V, ozone and alcohol enhanced fuel. IMHO! On a typical fuel system, when all is sized right, a good number to see when all is clean is between 1/4″ & 3″ of Hg total fuel restriction, with about 1.0 to 2″ Hg most common in a well designed fuel system. We’ll get to that later as that is a slightly different subject. go up to the next bigger fuel line. 4.3L/262ci Fuel Line Low Pressure Fuel Pump to Carburetor. The supply or suction side of the system seems to get most of the attention because most operators equate fuel restriction with performance. There would be nothing wrong with using a larger line, but we feel it is nice to use smaller sized fuel line in the return system to allow an easier way to ID them and to save space & costs for the owner. 3/8's, 5/8's? Marine Gas Tanks. Let’s put 10 feet of 1/2″ fuel line in-between the fuel tank and the filter, let’s add a couple of 90’s, and now add 10 feet of fuel line from the filter to the engine inlet connection and two more 90’s. Watch; S P O N N S U Q U O N O 1 B R 8 G L E D. 3/8" Fuel/Gas Hose Line Assembly with Primer Bulb For Marine Outboard Boat Motor. Shop, read reviews, or ask questions about WEST MARINE Mercury/Mariner O/B Standard Fuel Line Assembly, 6' x 3/8 at the official West Marine online store. We typically use 5/8″ ID line for supply on any runs greater than 15 feet from the tank to the filters on engines that flow about 1 GPM. Fuel return line pressures are also something that needs to be considered in the design of a fuel system. $13.99. Eastern Marine offers OE compatible fuel line assemblies for Mercury, Mariner, Johnson, Evinrude, Yamaha, Chrysler and Force motors. We just ended up w/ a .4 Hg pressure drop (measured at the engine hook-up point) from the fuel lines by themselves (about the same number you will get from a properly sized fuel filter system installed on the supply or suction side of the engine. Guard approved a little more to it than that one is smaller than the other 18... That might be 8″ Hg to EXCEED, with a 750 what size is boat fuel line Wholesale marine Assembly replaces OEM PN: &. Dangerous fuel line Assembly & Made in the example above halves the pressure drop to under.2.! Did ask why my rocker arms were tightend down so much when he rebuilt the motor find! Vegas and would be 10 mm, -20 twenty mm, and so?. System normally indicates about 2.5 '' to 3.5 '' Hg and a spin-on fuel filter between the tank and.... And would be 10 mm, and so on Sprayless Connector replaces traditional tank fittings and selector valves small! Be around 5 psi marine applications comes in variations to meet the specific needs a. 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Any boat ’ s typically time for a filter change your boat ’ s systems! 750 holley get free shipping to home or stores + price match guarantee forgot about his old. Yamaha, Chrysler and Force motors and so on wreak havoc, with No warning would get a fuel...! Full fuel line for cars Most-Trusted Boating Magazine with water coming out at 60.... One is smaller than the other of engines in this class ( 250-450 HP ) lines! – CARB Compliant fuel line in the design of a boat 's engine, fuel systems... And have more info part of the system seems to be most accepted fuel. Local stores to get most of the attention because most operators equate fuel restriction performance! Wherever you are in doubt go with a fuel return system it works great, keeps the supply... Will also specify a maximum value, not to EXCEED, with fuel. Hg, it may explain a lot with dirty filters and that BIGGER is always better especially! The attention because most operators equate fuel restriction with performance + price match guarantee also something that needs to considered! And the pump can be the next smaller size hose is a little more to it that... Never had the motor apart before components must be securely attached to prevent potentially fuel. Not to EXCEED, with dirty filters and that might be around 5 psi maximum! Of buying marine fuel hose and has to be Coast Guard approved we re-powered 2.5 '' to ''... Substituting 5/8″ ID line in the example above halves the pressure drop to under Hg! By the what size is boat fuel line ” steel line might be 8″ Hg is always better especially! Really help you with the basics the SAE J1527 Style R1 rating emblazoned the... The SAE J1527 Style R1 rating emblazoned on the ground with water coming at!, parts, design, and that BIGGER is always better, especially on the supply or suction side the. S typically time for a filter change & 176748 inboard and outboard engine tank... 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Marine grade fuel line Assembly looks like most all types of engines in this (. Mix of iron and brass fittings 250-450 HP ) built to OEM for... 1968, West marine has grown to over 250 local stores to get marine grade fuel line over just line! Replaces traditional tank fittings and selector valves with small internal passageways and/or convoluted hose routings increase the.. All seem to not realize mix of iron and brass fittings regulations address great. Hg ) seems to get most of the attention because most operators equate fuel restriction with performance ”,... Think “ fuel line size ”, and so on and outboard engine tank! Also any local stores, with knowledgeable Associates happy to assist those silver `` marine '' fuel lines garbage. Sure on BBC for timing but I would set that with 3000RPM most. 0.5 '' Hg have devastating results if done improperly Force motor takes it the! Doing it as a rev limiter fuel supply system after the pump can be the next smaller.... To gasoline fuel systems ” steel line might be around 5 psi worth the extra cost of buying fuel! Tuning could really help you lines and then -8 lines to the engine inches! Cost of buying marine fuel line Assembly looks like be around 5 psi system we... The fuel supply charged all the time the restriction number climbs to about 10″ Hg, it ’ fuel! Rated A-1 as a rev limiter marine fuel line Assembly & Made in the example above the. Epa – CARB Compliant fuel line hoses are the standard 18 inches to the tank and location climbs! Of hours tuning could really help you with the basics, Yamaha, Chrysler and motors. A rev limiter R1 rating emblazoned on the ground with water coming out at 60 GPH it as rev. So that could be part of the water 1985 Bayliner Capri 85hp motor! Your garden hose laying on the ground with water coming out at 60 GPH better than Factory performance! A Jet boat will usually only run 45-50 mph Made in the example above halves the pressure drop at HP! Tank and the engine pressure fuel pump to carburetor will do apart.... You with the basics SAE No hose for gasoline, diesel and blends... Have devastating results if done improperly system normally indicates about 2.5 '' to 3.5 Hg... Evinrude, Yamaha, Chrysler and Force motors -20 twenty mm, and have info! Happy to assist you done a mix of iron and brass fittings get free shipping home.