fuel line size for 1000 hp

Full Answer

How much HP can a fuel line support?

Understanding then how to size the supply and return line will be good information to know. Sizing Supply and Return Lines Properly For most applications the factory fuel lines have been able to support around 500 whp. There are variations to this based on each vehicle and the fuel being used.

Do fuel lines need to be large?

Yes, not just the feed line, but the return line must be large enough to not only flow the required amount to feed the engine, but the return line is important for allowing a fuel pressure regulator to effectively do its job. Can I oversize a fuel line?

How much fuel do I need to support 1000 hp?

OK stay with me now as we calculate how much gasoline fuel we need to support say 1000 HP. 1000 divided by 12 = 83.3 Gallons Per Hour or 315 Liters Per Hour. 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.

What size fuel line after the fuel pump?

The fuel line after the pump can be the next smaller size. When using E85, alcohol, methanol, etc. go up to the next bigger fuel line. Was this answer helpful?

What size fuel line do I need for 1000hp?

There are many factors that can dictate fuel line size and it is not just horsepower goals. For instance, an 8AN feed line and 6AN return line on a 1000 horsepower gasoline or race gas powered LS with 30psi is sufficient.

How much horsepower will a 3/8 fuel line support?

A 3/8”id fuel line can easily support 600 HP given sufficient “pump head”! Given a big enough pump a 3/8” steel line could support 1000 HP. The simple way to know is to install an electronic fuel pressure gauge.

How much horsepower will a 5/16 fuel line support?

If you're just cruising around with a carbed SBC, you'll probably be fine with a 5/16" line up to about 500 HP because you'll never tax the system enough to starve the motor of fuel.

Does fuel line size affect pressure?

Shows the relationship between measured pressure drop as a function of flow rate, for four different fuel lines (two different sizes at two different lengths). Every fuel line experiences pressure loss depending on fuel line length, and fuel flow rate.

How much HP will a Holley black support?

The Holley Red pump flows 97 gph and supports 425 hp, while the Blue pump flows 110 gph and supports 550 hp. Stepping up to the Black pump yields 140 gph and 750 hp.

What size fuel return line should I use?

The Fuel Return Line should be at least the same size, or one size larger than the supply. Make sure there are no sharp bends or kinks. The return line should direct fuel close to the bottom of the tank and away from the pickup.

Does a Holley Blue fuel pump need a return line?

Fuel pressure is pre-set at 15 PSI and both a pressure regulator and 3/8" return line to the tank are required.

How is fuel line measured?

0:573:13How To Measure the Diameter Of Any Hose - YouTubeYouTubeStart of suggested clipEnd of suggested clipSo it's 6 over 16 so 6 6 / 16 very very simplest and all that you do is you're taking 6 sixteenthsMoreSo it's 6 over 16 so 6 6 / 16 very very simplest and all that you do is you're taking 6 sixteenths of an inch and divide it by 2 if you can so 6 16 divided by 2 is 3/8.

What size is fuel hose?

Fuel Hose SizesAN SizeTube or Hose ODTube or Hose ID-63/8”.297”-81/2”.391”-105/8”.484”-123/4”.609”Mar 6, 2019

Is bigger fuel line better?

Fuel line diameter matters A LOT! A larger diameter is generally better, but the correct diameter is the best choice. If the diameter is too small: you won't be able to support your horsepower goal. If the diameter is too big: the lines will take longer to pressurize.

What happens if fuel pressure is too high?

If fuel pressure is too high, your vehicle's engine could be over fueled, leading to many of the symptoms listed below. Some of these symptoms include your engine running rough, poor fuel economy and black smoke from the exhaust.

How many Lph do you need for 500hp?

190 lphMaking the ChoiceFuel Pump Free FlowCarbureted EngineFuel Injected Engine40 gph/155 lph450 hp400 hp50 gph/190 lph600 hp500 hp67 gph/255 lph750 hp650 hp90 gph/340 lph1000 hp850 hp2 more rows•Nov 26, 2019

What is the minimum feed line for an E85?

For instance, an 8AN feed line and 6AN return line on a 1000 horsepower gasoline or race gas powered LS with 30psi is sufficient. However, on an E85 combo, we recommend a 10AN feed and an 8AN return minimum for the same setup minus the fuel change. We also like to take into account your future goals, and whether you order these lines and components from us, we suggest you do as well!

How much methanol does a gasoline engine use?

Methanol fuels use approximately double the amount of fuel of gasoline to reach a target power level. In the event that you are using Methanol in replacement of an intercooler (commonly referred to as running the engine "wet") you may use even more Methanol.

Can I undersize fuel lines?

Can I undersize fuel lines? Yes, not just the feed line, but the return line must be large enough to not only flow the required amount to feed the engine, but the return line is important for allowing a fuel pressure regulator to effectively do its job.

How much gasoline is needed to make 1 hp?

These figures are for gasoline engines and figured assuming a .05 BSFC ( . 5 lbs. of gasoline is needed make 1 hp for 1 hour). If you're in doubt, it's better to have more fuel flow then too little.

How much fuel do you need to make 400 horsepower?

In order to know what size injectors you need, you'll need to know how much fuel it takes to make the desired horsepower you want. The BSFC is simply how many pounds of fuel it takes to make 1 hp for 1 hour. BSFC will be about 0.45 for most street injection set ups. This means that if you have a 400 hp engine with a BSFC of 0.45 you'll need 180 lbs of fuel per hour to maintain 400 hp. The formula for pounds of fuel per hour is:

How much duty cycle does an 8 cylinder injector need?

Now if it is an 8 cylinder engine you can figure out that each injector must supply 22.5 lbs/hr. Injectors will work best if they don't exceed more than 85 duty cycle. An injector that flows 26.5 lbs/hr will be at an 85% duty cycle when flowing 22.5 lbs/hr, but you may not find an injector that flows exactly what you need. It is best to step up to the next size, for our example, we might need to step up to 30 lb/hr injectors. The formula for injector sizing is:

How much fuel pressure should I use for fuel injectors?

Most injectors are rated at 43.5 psi (which is about 3 bar ). By changing the pressure, you change the flow rate. If you need 25 lbs/hr, and there is an injector that will flow 24 lbs/hr at 85% duty cycle, it is possible to use more fuel pressure to make the injectors flow more. It is better to do this when the injectors are just a little too small, than to go to larger injectors. The chart below will show what can be done by adjusting fuel pressure. You can see from the chart that there are quite a few options to get very close to what you'll need.

What is a mon engine?

The motor octane rating, referred to as MON (motor octane number), is the best rating to use when selecting fuel for your race or high compression engine . When testing MON, the fuel is heated to 300° F and the intake air is heated to 100° F. The test engine is a single cylinder 4 cycle engine that is run at 900 rpm. Ignition timing is varied with compression ratio. Engine load is varied during test.

Is VP fuel good for high compression?

Notice how close all the VP racing fuels are, this makes VP an excellent choice for a high rpm, high compression racing engine.

How is fuel line size determined?

Fuel line size is determined by the horsepower of the engine.

How to calculate pump size in liters per hour?

Multiply horsepower by .314 to determine pump size in liters per hour.

How to calculate gallons per hour for a pump?

Multiply horsepower by .083 to determine pump size in gallons per hour.

How many whp can a fuel line hold?

For most applications the factory fuel lines have been able to support around 500 wh p. There are variations to this based on each vehicle and the fuel being used. For example if using E85, which requires 30% more fuel to reach stoic conditions, you would need to size the fuel lines even larger. If unfamiliar with ethanol based fuel, be sure to check out our article here on ethanol-based fuels.

How many whp is a stock fuel line?

Up to 500-550 whp: Stock Fuel Lines

Why is the return fuel line smaller than the supply line?

The reason for this is that the return line will always flow less fuel being that the motor is using a portion of the supplied fuel to burn and run the motor. Things look for when buying fuel line .

Is methanol good for fuel lines?

Many users today are discovering the benefits of using ethanol based fuels or methanol. While these fuels are great, not all fuel lines are rated to withstand their corrosive properties. Therefore it is important when purchasing fuel lines that you are realistic with the fuels you MAY end up running in your vehicle.

How many HP can a 3/8 fuel line support?

Now to answer your question, I've seen many cases where 3/8 fuel line supports 500+hp with an carter mech pump.

What factors are factored into the design of a fuel system?

Pump volume and desired pressure, line diameter and length/flow resistance, actual max fuel requirementmust all be factored into the design of the fuel system.

What is suction line?

The line induces pressure drop, or resistance to flow. on a suction systems, ie, mechanical pump, the fluid from the tank is not pressurized, so it is harder to move than say an electrical pump back at the tank that is sending it to the front of the car under pressure.

How much does a gallon of gas weigh?

A gallon of gasoline weighs approximately 6 lbs. (29 gallons) of fuel every hour. The bigger your line is, the easier it is to push the fluid without building pressure, so it really does depend more on the pump's ability to provide a specific flow rate at a specific pressure.

How to get more liquid through a quarter inch hole?

The only way to get more liquid thru in an hour is increase the pressure, or increase the hole diameter, not the size of the ocean.

Is 1/4 inch hole in battle ship line good?

as the volume that the line can flow is equal to or greater than the volume of all needles and seats that you are feeding, then your line is OK. If you put a 1/4 inch hole in the side of a battle ship it will only leak a certain volume of water thru it even though the entire ocean is on the other side. So, the way I see it the only variables are ...

Does changing line pressure affect bowl level?

Remember that changing the line pressure also affects bowl level so if the bowl level were correct at WOT/max-hp @ 4psi, then if the system held 8psi at idle/low throttle the bowl level will be incorrectly high, and vise-versa.

What is the base pressure of a fuel injector?

Ideally, we would prefer to have these injectors rated at a lower pressure like 43 psi. That’s better because this reduces the fuel pump’s pressure requirement because the manifold will be pressurized and we must boost-match the fuel pressure at a 1:1 ratio. With a boost pressure of 24 psi that puts a base of 43 + 24 = 67 psi. Most injectors today are still rated at 43 psi (3 bar) base pressure, but many are moving to flow ratings based on 58 psi (4 bar). Make certain you know the test pressure used to determine the injector’s flow rating. If the injector is rated at 58 psi, and you set the base pressure at 43 psi, it will flow less than its advertised flow rate.

How much fuel pressure does a Coyote need?

This produced a total fuel pressure requirement of 82 psi ( 58 + 24). This puts a significant strain on the fuel pump.

Why is operating pressure important for EFI?

Operating pressure is why you will see the advertised horsepower potential for a particular pump be higher for a carbureted system and lower for EFI. Increasing fuel pressure equals reducing fuel volume. Now let’s attempt to feed a belt-driven supercharged EFI engine making big power. This is doubly challenging because now we must supply a given amount of fuel just to feed the power required to spin the supercharger. Finally, the pump is faced with boost-matching the fuel pressure 1:1 with the intake manifold boost. You can see how this all stacks up as a challenge to the fuel delivery system.

How much more fuel does E85 use?

This ethanol-based fuel has a lower BTU heat content than gasoline, which means in order to make the same power with E85, we must burn roughly 30-percent more fuel compared to gasoline.

Which is better, a smooth bore or a carbureted engine?

A smooth bore hose (right) will offer dramatically better flow rate but must be handled carefully to prevent kinking. Naturally-aspirated, carbureted engines are the easiest to feed, because they push fuel at perhaps 15 psi to a dead-head regulator that knocks that down 5 to 7 psi.

Is pressure drop over a long feed line a concern?

Pressure drop over a long feed line is also a major concern, especially with E85’s high fuel flow requirements. At extreme horsepower levels it’s a balancing act between short length and diameter to maintain decent fuel velocity as well as flow.

Is fuel delivery a system?

First and foremost , it’s important to emphasize that the fuel delivery system must be viewed as a system. Unfortunately most builders approach this as merely a pile of individual parts. That tends to work with low delivery rates and 400 horsepower. But with engines making four-digit power, you can no longer enjoy the luxury of overlooking details. The entire system—including the fuel injectors—must be considered as members of the same team.