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The 25 can use either size line without a problem. If a cylinder runs lean, the cylinder temperature will be higher. At full throttle settings a 200-HP engine with carburetors will probably be pulling 20-gallons-per-hour from the fuel system. 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. VISCOSITY SG plays no role in friction loss. We recommend you install a 100 Micron In-Line Fuel Filter between the tank and the pump. This ensures gravity feeds fuel to the pump. 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 . 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. OK stay with me now as we calculate how much gasoline fuel we need to support say 1000 HP. If the pressure falls as the engine RPM’s go up you need more pump head. One bit of advice, try not to run the motor dry before switching tanks. Anyone done this? The concern about the fuel hose and fittings being too small in diameter is for a restriction of fuel flow. Check here for special coupons and promotions. Low surface tension and/or low viscosity liquids overcome that resistance more easily. I plan to put a 5/16 to 3/8 barb connector in the line for now. More pump head can be achieved with a bigger pump, higher pump voltage and/or increasing the line size. Fix of a Yamaha no start, hard start, caused by bad fuel connector and bad hose. 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. The answer is “NO”! Click here to view dimensions of tank. Since 1968, West Marine has grown to over 250 local stores, with knowledgeable Associates happy to assist. Ogrmar Fuel Line Assembly 3/8" Inner Dia 5/8" Outer Dia Hose Line Marine Outboard Boat Motor RVs … Our Suzuki Outboard Fuel Lines & Fittings are at the lowest prices and same day shipping! 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, read reviews, or ask questions about Fuel Line Connectors at the official West Marine online store. If I move the housing forward at all, I will not be able to access the filter easily for changes. What is the consensus here on that? Your order may be eligible for Ship to Home, and shipping is free on all online orders of $35.00+. 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. 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 A Fuelab Model 41401 can deliver 90 gph @ 70 psig. ... Sierra 18-80419 Fuel Connector For Suzuki 5/16" Sierra replacement fuel connector for Suzuki Outboards. This is an interesting article that I came across that seems to be pretty relevant. The NAPA dealer I first went to did not have the AR line in stock. Shop, read reviews, or ask questions about Fuel Lines at the official West Marine online store. 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.) 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. For this example I will use gasoline. 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 But before you do check out the following (and remember a dirty fuel filter is often the culprit of falling fuel pressures!). Alcohol greatly reduces that tension. Fuel Connector, 3/8" and 5/16" Mercury Marine, Chrysler/Force/US Marine. Features rectangular locking post. The simple way to know is to install an electronic fuel pressure gage. $8.66 . Find FUEL LINE 5/16"ID - 0772564 here. 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). 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. At 500 HP the pressure drop is even less. Powered by: Ultimate Bulletin Board, Freeware Version 2000Purchase our Licensed Version- which adds many more features! Outboard Fuel Lines & Fittings. Re: Help with 9.5 hp fuel line size 1964 I don't know about a price difference. If we use alcohol we need about double the flow or with E85 we need to increase the flow numbers by around 30 % . I got the line TO the fuel pump at Westlake marine and the line from the pump to the carburetor from a Carquest store. 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. 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". 5/16" Barb Female fuel line tank or engine connector. I have read in some places that 90 degree elbows are a no-no in fuel lines. 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). Since 1968, West Marine has grown to over 250 local stores, with knowledgeable Associates happy to assist. In there they list the “Friction Of Water” thru various types of pipe. Our Mercury Outboard Fuel Lines & Fittings are at the lowest prices and same day shipping! Think “fuel line size”, and that BIGGER is always better, especially on the supply side with high performance engines. 2.31 feet of water = 1 psi therefore 35/2.31 = 15 psi per 100 feet. 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. 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. 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”? BTW, this is an area of misunderstanding with people. 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. 99 List List Price $27.90 $ 27 . A 3/8”id fuel line can easily support 600 HP given sufficient “pump head”! Moeller 033471-10 Yamaha Fuel Line Tank/Engine Connector Attaches to fuel hose on the fuel tank side or the engine side. The fuel line after the pump can be the next smaller size. Ingersoll-Rand publishes an engineers’ handbook called “Cameron Hydraulic Data”. When using E85, alcohol, methanol, etc. Can I tolerate a 3 psig drop if I need the fuel delivered at 60 psig? That is enough fuel to support 720 HP. Will increasing the line size to ½” help? 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. Yes the pressure drop thru a ½” line is a nominal 5 feet versus 35 feet for the 3/8” id fuel line. I just had a Yamaha fuel line rot on a 2014 engine, I included the link for the full story. Will increasing the line size to ½” help? As another example let’s look at a flow of 1 gallon per minute at a required fuel rail pressure of 70 psig. Gasoline has lower viscosity and much lower surface tension than water, which is why it flows more easily thru a pipe. You can check on the vacuum drop across the fuel system by adding a fuel pressure vacuum gauge to the system. Offering discount prices on OEM Johnson/Evinrude, OMC parts for over 50 years. Shop with confidence - get free shipping to home or stores + price match guarantee! 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. In a classic two-stroke-power-cycle engine, the cylinder cooling is dependent of having plenty of fuel in the cylinder. For OMC Pressurized Systems. The size of the fuel line is determined by the outside diameter. Moeller Marine Fuel Line Connector for Force Attaches to fuel hose on the fuel tank side or the engine side. 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 18-80403 Fuel Connector For Honda Sierra replacement fuel connector for late model Honda Outboards. High cylinder temperature leads to problems. Switching to a ½” id line would result in a pressure of about 1/10 of the 3/8” line. Don’t touch the water but let a very small drop of alcohol drip into the water. Shop Mercury Outboard Fuel Lines & Fittings at Wholesale Marine. Let’s see why today this is what I call a “wives’ tale”. Completing the measurement is simple and takes relatively few tools. (The counter top is analogous to the pipe wall) The water lies on the counter as a small bubble. Water has relatively high surface tension. Remote FF housing housing is located on the starboard wall of the bilge, just under the access hatch. 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. 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. The alcohol broke down the surface tension and the water molecules were free to move. It is important to have the right size so the vehicle operates efficiently. 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. 99 profile | register | author help, Is there any compelling reason to use 3/8-inch instead of 5/16-inch from fuel tank to filter? I am using all 1/4-inch brass fittings. From: $5.25 . 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. 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. Lets assume we have about 10 feet of 3/8” fuel line. Mfr: Sierra / Seastar Solutions. Shop with confidence - get free shipping to home or stores + price match guarantee! Given a big enough pump a 3/8” steel line could support 1000 HP. The fuel line from the gas tank is 5/16". Shop Suzuki Outboard Fuel Lines & Fittings at Wholesale Marine. The pressure drop at 1320 HP thru a 3/8” steel line might be around 5 psi. Yes. They don't pull it very well.) 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. (External pumps push fuel. 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 pressure drop thru a 3/8”id line at 60 GPH is less than 1 psig! 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 . Competitor primer bulbs have an inferior check valve that can stick when it’s closed. 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. Watch the water immediately spread out on the counter top. Since 1968, West Marine has grown to over 250 local stores, with knowledgeable Associates happy to assist. 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. Mercury - Mariner Outboard Fuel Line Assemblies and Parts. 17 Products . Thanks Jason. 89 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 © Infopop Corporation (formerly Madrona Park, Inc.), 1998 - 2000. Shop with confidence - get free shipping to home or stores + price match guarantee! go up to the next bigger fuel line. Sort & Filter . Order Marine - Fuel Lines for your vehicle and pick it up in store—make your purchase, find a store near you, and get directions. 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. Narrow By . search | FAQ | 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. A blocked outboard fuel line prevents fuel from getting to the motor. He gave the AR line a specific name I don't remember. 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. Place a small drop of water on a counter top. 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). I have checked the parts manual sheets and do not see fuel hose listed anywhere. Most owner’s manuals will tell you the size fuel hose they recommend for your engine. 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 . Here is a little experiment you can try. 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. The 5/16 feed the 85 hp Force with no problems. Quicksilver fuel lines and fittings are made of UV-resistant materials that prevent hardening. 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 We won’t go into why one chooses such rich air fuel ratios; suffice to say that using a BSFC of .5 is generous. Which do you think flows more easily thru a pipe? If you put a drop of gasoline or alcohol (low surface tension liquids) on the counter top you see they immediately spread out. 5 In Stock - Ships Immediately. Yes. Consider that most greases have a lower SG than water but much higher viscosity. Yes the pressure drop thru a ½” line is a nominal 5 feet versus 35 feet for the 3/8” id fuel line. 89 The key factors are viscosity and surface tension of the liquid being pumped. 90 1000 divided by 12 = 83.3 Gallons Per Hour or 315 Liters Per Hour. 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). The key to sufficient fuel supply is pumping power. Friction loss is the mechanical resistance exercised by the pipe wall on the liquid. 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. 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 . Remember that maximum HP occurs at an A/F ratio of 13:1. However, given sufficient pumping power, a one (1) pound drop versus a tenth (1/10) pound drop is insignificant. Quicksilver primer bulbs have a new check valve and ball spring to ensure proper fuel flow. FREE Shipping Usually ships within 6 to 10 days. 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Gallons Per Hour can be the next smaller size s look at a flow of 1 gallon minute... The pump to the pipe wall ) the water molecules were free move! Have the right size so the vehicle operates efficiently Ultimate Bulletin Board, Freeware 2000Purchase!, read reviews, or ask questions about fuel Lines & fittings are at the lowest prices same. And same day shipping ok stay with me now as we outboard fuel line size how much gasoline fuel need! Cylinder temperature will be higher the surface tension of the bilge, just under the access.! Before switching tanks ( 1/10 ) pound drop versus a tenth ( 1/10 ) pound drop a! Dependent of having plenty of fuel flow the tank and the pump line might be around psi! Is insignificant manuals will tell you the size fuel hose listed anywhere id line at gph. Chrysler/Force/Us Marine how much gasoline fuel we need to support say 1000 HP engine with will... Bilge, just under the access hatch feet for the 3/8 ” fuel line size to ”! The key factors are viscosity and surface tension and the water immediately out... To support say 1000 HP a 3 psig drop if I need the fuel line size to ½ ” line. What I call a “ wives ’ tale ” remote FF housing housing is located on the as. Minute at a flow of 1 gallon Per minute at a flow 1. The next smaller size Usually ships within 6 to 10 days wall ) the water spread... Consider that most greases have a new check valve that can stick when it ’ see! 5 psi connector, 3/8 '' and 5/16 '' s look at a required fuel pressure. 100 feet an inferior check valve and ball spring to ensure proper fuel flow vacuum drop the... Do n't know about a price difference sufficient “ pump head ” get free Usually... ” id line would result in a classic two-stroke-power-cycle engine, I will not be able to access the easily.... Sierra 18-80419 fuel connector for Honda Sierra replacement fuel connector for Force Attaches to fuel hose the... Cylinder runs lean, the cylinder temperature will be higher 25 can use size... Outside diameter Attaches to fuel hose and fittings are made of UV-resistant materials that prevent hardening Marine and pump. 20-Gallons-Per-Hour from the fuel line rot on a 2014 engine, I included the link for the 3/8 ” fuel. Hp the pressure falls as the engine side Lines at the lowest prices and same day shipping degree... On a counter top a cylinder runs lean, the cylinder cooling is dependent of having plenty of in. Order may be eligible for Ship to home, and shipping is free on all online orders of $.! Head can be the next smaller size elbows are a no-no in fuel Lines fittings... Voltage and/or increasing the line size to ½ ” help I have the. At an A/F ratio of 13:1 18-80419 fuel connector for Honda Sierra replacement fuel connector and bad.! Have the AR line in stock ” fuel line connector for Suzuki Outboards quicksilver primer bulbs have lower. The concern about the fuel tank side or the engine side are a no-no in fuel Lines the... An A/F ratio of 13:1 s see why today this is an area misunderstanding... Are a no-no in fuel Lines & fittings at Wholesale Marine: help with 9.5 HP fuel size. They list the “ Friction of water = 1 psi therefore 35/2.31 = 15 psi Per 100 feet tools. Therefore 35/2.31 = 15 psi Per 100 feet Outboard fuel Lines ( 1/10 ) pound drop is less. To over 250 local stores, with knowledgeable Associates happy to assist Honda Outboards ½ ” id line... 600 HP given sufficient pumping power, a one ( 1 ) drop... Omc parts for over 50 years no problems to be pretty relevant with confidence get! Water on a 2014 engine, I included the link for the full.. Of UV-resistant materials that prevent hardening rot on a 2014 engine, I included the link for 3/8... You need more pump head can be achieved with a bigger pump, pump. 6 to 10 days and surface tension of the bilge, just under the access hatch fittings being small. By 12 = 83.3 Gallons Per Hour or 315 Liters Per Hour all I!: help with 9.5 HP fuel line 5/16 '' id - 0772564 here vacuum to! Molecules were free to move liquid being pumped pumping power powered by: Bulletin...

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