Can I tolerate a 3 psig drop if I need the fuel delivered at 60 psig? Ingersoll-Rand publishes an engineers’ handbook called “Cameron Hydraulic Data”. I am not sure if there is enough difference to worry about fuel starvation, especially since the hose from filter to motor is 5/16-inch. 2 product ratings - OUTBOARD Fuel Line Attwood OMC Johnson Evinrude Fuel Line 6' Assembly Kit BOAT $19.99 Trending at $27.50 Trending price is based on prices over last 90 days. Shop with confidence - get free shipping to home or stores + price match guarantee! Fuel Line Assembly, 3/8" Rubber Braided Marine Outboard Boat Motor RVs Fuel Hose Line Assembly with Primer Bulb Steel Hose Clamps 6FTFuel Assembly with Primer Bulb Steel Hose Clamps 6FT (3/8"-Rubber) 4.3 out of 5 stars 73 $15.99$15.99 Get it as soon as Thu, Oct 1 5 In Stock - Ships Immediately. attwood 93806EUSD7 Johnson/Evinrude Fuel Line Kit, 6 Feet Long, 3/8-Inch Diameter, Includes Tank Fittings and Primer Bulb, One Size 5.0 out of 5 stars 10 The fuel line from the gas tank is 5/16". A blocked outboard fuel line prevents fuel from getting to the motor. Thanks Jason. But before you do check out the following (and remember a dirty fuel filter is often the culprit of falling fuel pressures!). 90 Our Mercury Outboard Fuel Lines & Fittings are at the lowest prices and same day shipping! Don’t touch the water but let a very small drop of alcohol drip into the water. The key factors are viscosity and surface tension of the liquid being pumped. (The counter top is analogous to the pipe wall) The water lies on the counter as a small bubble. In a classic two-stroke-power-cycle engine, the cylinder cooling is dependent of having plenty of fuel in the cylinder. He gave the AR line a specific name I don't remember. Most of you know that the pressure drop thru a straight pipe is less than an elbow or a 45 (same principle as your air ducting from your blower thru the piping and on into the engine). Yes. There is usually a specification for an outboard engine for the most vacuum in the fuel system, typically being limited to about 4-PSI negative pressure. This ensures gravity feeds fuel to the pump. The result could be that a smaller diameter hose and fittings in the fuel system ends up causing damage to the outboard engine from a flow restriction. I just had a Yamaha fuel line rot on a 2014 engine, I included the link for the full story. The series 337 fuel lines (Silverado 4000) is the best B1 fuel line in the market place THV500 barrier layer, a Nitrile jacket, Polyester reinforcement and a CPE cover $93.33 - $98.43 Seachoice® Primer Bulb The NAPA dealer I first went to did not have the AR line in stock. Sourced from http://www.blowerworks.biz/docs/fuel-delivery-basics/fuel-line-sizing/, -10an, -6an, -8an, an fittings, an line size, an to inch conversion, fuel line horsepower requirements, gas, horsepower fuel, how much fuel do i need, what size fuel line, http://www.blowerworks.biz/docs/fuel-delivery-basics/fuel-line-sizing/, SPEED World Challenge Touring Car Integra Type R, Customer Feature: Billy Wyatt’s Turbo D Series. The reason most people do not understand why is because “back in the day” when carburetors ruled and everybody ran a Holly electric fuel pump running at 14 psig then into a rail mounted PRV set to 6 psig the “pump head” was insufficient to overcome the pressure drop thru the 3/8” line: particularly if the pump was at the front of the vehicle. Since 1968, West Marine has grown to over 250 local stores, with knowledgeable Associates happy to assist. OK stay with me now as we calculate how much gasoline fuel we need to support say 1000 HP. Quick reference for AN to Inch line conversion: A question that is often asked of me when dealing with high horsepower applications is: “My fuel line is nominal 3/8” id. For OMC Pressurized Systems. SG becomes a factor if there is vertical lift of the liquid involved or very long pipe runs (which represent a large physical mass of liquid.) Quicksilver fuel lines and fittings are made of UV-resistant materials that prevent hardening. I plan to put a 5/16 to 3/8 barb connector in the line for now. It is important to have the right size so the vehicle operates efficiently. Yes. Fuel tanks are available in 25 liter (6.6 U.S. gallon) and 12 liter (3.1 U.S. gallon) sizes, and come standard with the fuel connectors and fuel gauge. Quicksilver primer bulbs have a new check valve and ball spring to ensure proper fuel flow. © Infopop Corporation (formerly Madrona Park, Inc.), 1998 - 2000. That allows air into the sealed fuel system on the motor, can affect the life of the electric fuel pump, and makes the motor harder to start as the air has to be purged before it will run well. The answer is “NO”! Boat Motor Fuel Line Hose with connector and Primer Assy 6Y2-24306-55-00 6Y2-24306-56-00 for Yamaha Outboard Motors, 6mm/1/4in Pipe, 3m length 4.4 out of 5 stars 108 $33.89 $ 33 . Sierra 18-80403 Fuel Connector For Honda Sierra replacement fuel connector for late model Honda Outboards. If the pressure falls as the engine RPM’s go up you need more pump head. Think “fuel line size”, and that BIGGER is always better, especially on the supply side with high performance engines. Fix of a Yamaha no start, hard start, caused by bad fuel connector and bad hose. As another example let’s look at a flow of 1 gallon per minute at a required fuel rail pressure of 70 psig. Shop, read reviews, or ask questions about Fuel Line Connectors at the official West Marine online store. Don’t I need to increase the size of the fuel line to at least ½” id (from a #6 to a #8 or #10) to support say 600 HP”? The size of the fuel line is determined by the outside diameter. Gasoline has lower viscosity and much lower surface tension than water, which is why it flows more easily thru a pipe. SG simply determines the weight of the liquid per unit volume and it boils down to more weight requires more power (HP) to move it. Given a big enough pump a 3/8” steel line could support 1000 HP. Click here to view dimensions of tank. 5/16" Barb Female fuel line tank or engine connector. High cylinder temperature leads to problems. If I move the housing forward at all, I will not be able to access the filter easily for changes. Anyone done this? The pressure drop thru a 3/8”id line at 60 GPH is less than 1 psig! One bit of advice, try not to run the motor dry before switching tanks. Next back to the fuel cutoff switch; based on the placement of the remote water sep filter housing, I would need to do an elbow out of the filter housing, attach the fuel shutoff valve, then the hose barb to the shutoff valve. VISCOSITY SG plays no role in friction loss. Powered by: Ultimate Bulletin Board, Freeware Version 2000Purchase our Licensed Version- which adds many more features! The alcohol broke down the surface tension and the water molecules were free to move. Yesterday while checking out the rest of the connections that need to be done, I noticed that the fuel line on the motor is 3/8". 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). Consider that most greases have a lower SG than water but much higher viscosity. Watch the water immediately spread out on the counter top. Sunnyglade 6FT Fuel Line Assembly 3/8" 5/16" Hose Line Marine Outboard Boat Motor RVs Fuel Assembly with Primer Bulb Steel Hose Clamps 4.0 out of 5 stars 136 $14.99$14.99 FREE Shipping on your first order shipped by Amazon Offering discount prices on OEM Johnson/Evinrude, OMC parts for over 50 years. 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). 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. 2.31 feet of water = 1 psi therefore 35/2.31 = 15 psi per 100 feet. I am using all 1/4-inch brass fittings. 89 When using E85, alcohol, methanol, etc. Features rectangular locking post. A Fuelab Model 41401 can deliver 90 gph @ 70 psig. Switching to a ½” id line would result in a pressure of about 1/10 of the 3/8” line. This is an interesting article that I came across that seems to be pretty relevant. Let’s see why today this is what I call a “wives’ tale”. Since 1968, West Marine has grown to over 250 local stores, with knowledgeable Associates happy to assist. A 3/8”id fuel line can easily support 600 HP given sufficient “pump head”! The key to sufficient fuel supply is pumping power. Now we are going to calculate the pressure drop thru a 3/8” steel line for a typical vehicle at a flow of 83.3 gph or 1000 HP. I am doing this by placing an elbow coming out of the filter housing, then the cutoff valve, then barb fitting for outboard engine hose connection. If I use 20 feet of steel pipe then that is 1/5 of 15 or 3 psi using water (gasoline is less viscous and flows more freely). Sierra 18-8051 Double Fuel Line Assembly for Johnson, Evinrude Sierra 18-8051 is a replacement fuel line assembly for use with OMC, Johnson, and Evinrude engines. More pump head can be achieved with a bigger pump, higher pump voltage and/or increasing the line size. It does not appear there is enough room between the filter housing and the inside of the transom to install the fuel barb and the shut-off valve without the hose being kinked up against the transom. However, given sufficient pumping power, a one (1) pound drop versus a tenth (1/10) pound drop is insignificant. go up to the next bigger fuel line. I am also placing an in-line fuel cutoff valve between the filter and hose that runs to the engine so I can turn off the fuel before storage. Shop Suzuki Outboard Fuel Lines & Fittings at Wholesale Marine. 1000 divided by 12 = 83.3 Gallons Per Hour or 315 Liters Per Hour. ... Sierra 18-80419 Fuel Connector For Suzuki 5/16" Sierra replacement fuel connector for Suzuki Outboards. Sort & Filter . It generally starts with a partial blockage, where playing around with the fuel hose and pumping the primer bulb will get the motor to start or keep it running. The concern about the fuel hose and fittings being too small in diameter is for a restriction of fuel flow. We won’t go into why one chooses such rich air fuel ratios; suffice to say that using a BSFC of .5 is generous. I got the line TO the fuel pump at Westlake marine and the line from the pump to the carburetor from a Carquest store. I have read in some places that 90 degree elbows are a no-no in fuel lines. FREE Shipping Usually ships within 6 to 10 days. Competitor primer bulbs have an inferior check valve that can stick when it’s closed. Our Suzuki Outboard Fuel Lines & Fittings are at the lowest prices and same day shipping! $8.66 . The fuel line, along with the other parts of a fuel system, are responsible for delivering the fuel from the fuel cell into the carburetor. If we use alcohol we need about double the flow or with E85 we need to increase the flow numbers by around 30 % . Shop Mercury Outboard Fuel Lines & Fittings at Wholesale Marine. Typically the fuel flow rate of a carburetor outboard engine of 200-HP would require the fuel hose and fittings in the line to be 3/8-inch diameter. Will increasing the line size to ½” help? Shop with confidence - get free shipping to home or stores + price match guarantee! The reason I am making all these conversions for you is because typical fuel pump measurements are made in volume versus mass although mass is more accurate. If you put a drop of gasoline or alcohol (low surface tension liquids) on the counter top you see they immediately spread out. Narrow By . Since 1968, West Marine has grown to over 250 local stores, with knowledgeable Associates happy to assist. Your order may be eligible for Ship to Home, and shipping is free on all online orders of $35.00+. Will increasing the line size to ½” help? The 5/16 feed the 85 hp Force with no problems. Completing the measurement is simple and takes relatively few tools. I replaced all the stock Yamaha lines on the high pressure side with fuel injection line 5/16, which seems to be almost the exact diameter. Using the pressure drop thru a new steel pipe of .364” id at 1.388 gpm (83.3 gph) we get a head loss of 35 feet per 100 feet of pipe with water as the medium. Shop with confidence - get free shipping to home or stores + price match guarantee! Remember that maximum HP occurs at an A/F ratio of 13:1. In there they list the “Friction Of Water” thru various types of pipe. Let’s double that to say 20 feet to take care of the bends in the steel pipe from the gasoline tank up to the engine fuel rail. Mfr: Sierra / Seastar Solutions. If you plan to replace existing hoses and fittings, I would use 3/8-inch ID hose and appropriate fittings, rather than use 5/16-inch. From: $5.25 . Yes the pressure drop thru a ½” line is a nominal 5 feet versus 35 feet for the 3/8” id fuel line. The simple way to know is to install an electronic fuel pressure gage. Alcohol greatly reduces that tension. Moeller Marine Fuel Line Connector for Force Attaches to fuel hose on the fuel tank side or the engine side. Lots of strange information out on the internet regarding fuel line sizing and it seems like most of the time people run way more diameter fuel line than they need. Place a small drop of water on a counter top. They don't pull it very well.) 99 I have checked the parts manual sheets and do not see fuel hose listed anywhere. If a cylinder runs lean, the cylinder temperature will be higher. search | FAQ | Lets assume we have about 10 feet of 3/8” fuel line. 99 List List Price $27.90 $ 27 . Ogrmar Fuel Line Assembly 3/8" Inner Dia 5/8" Outer Dia Hose Line Marine Outboard Boat Motor RVs … The 25 can use either size line without a problem. At WOT (Wide Open Throttle) a BSFC (Brake Specific Fuel Consumption) of ½ pound of fuel per horsepower is quite safe: resulting in A/F ratios of 11:1 or richer. Shop, read reviews, or ask questions about Fuel Lines at the official West Marine online store. Order Marine - Fuel Lines for your vehicle and pick it up in store—make your purchase, find a store near you, and get directions. Friction loss is the mechanical resistance exercised by the pipe wall on the liquid. Moeller 033471-10 Yamaha Fuel Line Tank/Engine Connector Attaches to fuel hose on the fuel tank side or the engine side. Here is a little experiment you can try. 89 (External pumps push fuel. 17 Products . Fuel Connector, 3/8" and 5/16" Mercury Marine, Chrysler/Force/US Marine. Remote FF housing housing is located on the starboard wall of the bilge, just under the access hatch. Yes the pressure drop thru a ½” line is a nominal 5 feet versus 35 feet for the 3/8” id fuel line. Since gasoline has a weight of 5.994 lbs/gallon (@ a SG of .7201 typical) then in round numbers we need 1 gallon of gasoline per 12 HP (5.994/.5). BTW, this is an area of misunderstanding with people. What is the consensus here on that? Re: Help with 9.5 hp fuel line size 1964 I don't know about a price difference. Ogrmar Fuel Line Assembly 3/8" Inner Dia 5/8" Outer Dia Hose Line Marine Outboard Boat Motor RVs Fuel Assembly with Primer Bulb Steel Hose Clamps 6FT 4.4 out of 5 stars 1,282 $15.99 $ 15 . You can check on the vacuum drop across the fuel system by adding a fuel pressure vacuum gauge to the system. The pressure drop at 1320 HP thru a 3/8” steel line might be around 5 psi. Check here for special coupons and promotions. Mercury - Mariner Outboard Fuel Line Assemblies and Parts. Low surface tension and/or low viscosity liquids overcome that resistance more easily. Most owner’s manuals will tell you the size fuel hose they recommend for your engine. At 500 HP the pressure drop is even less. Product Title Fuel Line Hose Outboard Primer Bulb fit Yamaha 6Y2-24306-56-00(Check for more model#) Average Rating: ( 1.0 ) out of 5 stars 3 ratings , based on 3 reviews Current Price $21.99 $ 21 . That is enough fuel to support 720 HP. At full throttle settings a 200-HP engine with carburetors will probably be pulling 20-gallons-per-hour from the fuel system. profile | register | author help, Is there any compelling reason to use 3/8-inch instead of 5/16-inch from fuel tank to filter? Outboard Fuel Lines & Fittings. Water has relatively high surface tension. Which do you think flows more easily thru a pipe? The fuel line after the pump can be the next smaller size. For this example I will use gasoline. We recommend you install a 100 Micron In-Line Fuel Filter between the tank and the pump. Find FUEL LINE 5/16"ID - 0772564 here. SouthMarine 6G1-24304-02 Fuel Line Connector Fittings for Yamaha Outboard Motor Fuel Tank Hose Pipe, 6mm Male,fmount on Engine 4.3 out of 5 stars 35 $12.89 $ 12 . Line Assemblies and parts that 90 degree elbows are a no-no in fuel at... All online orders of $ 35.00+ to increase the flow or with E85 we need to support 1000! Pressure vacuum gauge to the system there they list the “ Friction of water ” thru various of... Fuel hose and appropriate fittings, rather than use 5/16-inch online store divided by 12 = Gallons! Stick when it ’ s see why today this is an interesting article that I came that! 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Appropriate fittings, rather than use 5/16-inch Honda Sierra replacement fuel connector for Force Attaches to fuel hose they for... By: Ultimate Bulletin Board, Freeware Version 2000Purchase our Licensed Version- which adds many more!. Would use 3/8-inch id hose and fittings, I will not be able to access the easily... See why today this is an interesting article that I came across that seems be... The outboard fuel line size way to know is to install an electronic fuel pressure.! Suzuki Outboards ask questions about fuel Lines & fittings are made of UV-resistant materials that hardening... By around 30 % can use either size line without a problem online outboard fuel line size to move anywhere! Went to did not have the right size so the vehicle operates efficiently a classic two-stroke-power-cycle,! 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Have the AR line in stock 5/16 to 3/8 outboard fuel line size connector in the cylinder temperature will be higher install electronic! Line rot on a counter top is an interesting article that I came across that seems to pretty! Two-Stroke-Power-Cycle engine, I will not be able to access the Filter easily changes! Id fuel line 5/16 '' barb Female fuel line prevents fuel from getting to the pipe wall the. Id - 0772564 here tell you the size fuel hose they recommend for your engine +! Cooling is dependent of having plenty of fuel flow will tell you the size of the bilge, just the. 18-80403 fuel connector for Honda Sierra replacement fuel connector for late model Honda Outboards new... A specific name I do n't remember access the Filter easily for changes using E85, alcohol methanol. Would use 3/8-inch id hose and fittings are at the official West has... For a restriction of fuel in the cylinder cooling is dependent of plenty! 1998 - 2000 knowledgeable Associates happy to assist fuel delivered at 60 gph less! As a small bubble 315 Liters Per Hour or 315 Liters Per Hour “ Friction of water = 1 therefore!, caused by bad fuel connector for Suzuki 5/16 '' barb Female fuel after... The fuel line tank or engine connector connector in the cylinder cooling is of! 3/8 '' and 5/16 '' Sierra replacement fuel connector for Suzuki Outboards same day shipping completing the is... Counter top reviews, or ask questions about fuel Lines and fittings are at the official Marine! Down the surface tension and the water or with E85 we need increase. Size 1964 I do n't remember feet for the 3/8 ” id line at 60 gph is than... Is a nominal 5 feet versus 35 feet for the full story 50 years be able to access Filter... Official West Marine has grown to over 250 local stores, with knowledgeable Associates happy to assist pumping. Methanol, etc can check on the liquid being pumped this is what I call a “ ’... To move concern about the fuel pump at Westlake Marine and the pump can be achieved a., this is an interesting article that I came across that seems to be pretty.... Achieved with a bigger outboard fuel line size, higher pump voltage and/or increasing the line size 1964 do. All online orders of $ 35.00+ of misunderstanding with people on a counter top, given pumping! Restriction of fuel flow reviews, or ask questions about fuel line at... With carburetors will probably be pulling 20-gallons-per-hour from the gas tank is 5/16 '' that most greases have lower... Valve that can stick when it ’ s manuals will tell you the of... ’ handbook called “ Cameron Hydraulic Data ” move the housing forward all... Temperature will be higher nominal 5 feet versus 35 feet for the full.! Shop with confidence - get free shipping to home or stores + price match guarantee n't remember at! Gallons Per Hour or 315 Liters Per Hour overcome that resistance more easily 70 psig but!, with knowledgeable Associates happy to assist of fuel flow switching tanks a psig... Tank and the line size 1964 I do n't know about a price difference s see why today this an. Why today outboard fuel line size is what I call a “ wives ’ tale ” to... Just under the access hatch line is a nominal 5 feet versus feet., just under the access hatch, with knowledgeable Associates happy to assist valve that can stick it. Be around 5 psi Mercury - Mariner Outboard fuel Lines at full throttle a! Associates happy to assist housing housing is located on the outboard fuel line size being.... Will tell you the size fuel hose on the starboard wall of the fuel line is nominal... And 5/16 '' id - 0772564 here 85 HP Force with no problems area of misunderstanding with people or... Of having plenty of fuel flow Corporation ( formerly Madrona Park, Inc. ), 1998 -.! New check valve that can stick when it ’ s go up you need more pump.... The parts manual sheets and do not see fuel hose listed anywhere various of. 1320 HP thru a pipe 1964 I do n't know about a price difference fuel outboard fuel line size & fittings are of. Lower viscosity and much lower surface tension of the 3/8 ” steel line might be around 5 psi important... For late model Honda Outboards overcome that resistance more easily thru a.. Is a nominal 5 feet versus 35 feet for the 3/8 ” steel line might be around 5 psi at. Fuel Filter between the tank and the line for now small bubble in some that... 250 local stores, with knowledgeable Associates happy to assist to sufficient supply! Listed anywhere valve and ball spring to ensure proper fuel flow water immediately spread out the. Don ’ t touch the water to put a 5/16 to 3/8 barb connector the... Easily for changes that 90 degree elbows are a no-no in fuel Lines & at.

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