FAQ: Dodge 318 2-barrel Carburetor What Size Electric Fuel Pump?

How do I choose an electric fuel pump?

A good estimator of volume to power is approximately 10 hp per gallon or 2.64 hp per liter. For example if your pump flows at 50 gph it should be able to support a 500 hp engine (50 x 10 = 500). However, to actually know the gph you must also consider the fuel pressure required for your engine.

How do I choose a fuel pump?

How do I know what flow rate I need?

  1. 500 X 0.5 = 250 lbs./hr. A gallon of fuel weighs 6 lbs. To get gph divide lbs./hr. by 6.
  2. 250 lbs./hr. ÷ 6 = 41.67 gph. A liter of fuel weighs about 1.6 lbs.
  3. 250 lbs./hr. ÷ 1.6 = 156.25 lph. You need the minimum flow rate at your fuel system’s operating pressure.

Can I use a EFI fuel pump with carburetor?

Any of our in-tank pumps can feed a carbureted engine provided that a bypass regulator is used. Because an EFI fuel pump can produce a large amount of flow, a bypass regulator is necessary in order to return the excess fuel back to the fuel tank.

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How much fuel pressure does a carburetor need?

Fuel pressure should be set between 6 and 8 psi for a gasoline carburetor. An alcohol carburetor is a different animal with very different requirements. The Alky carburetor will require 4 to 5 psi at idle and 9 to 12 psi at wide open throttle. Remember, fuel pressure is not a substitute for volume!

Do electric fuel pumps run continuously?

There is no fuel return line from the engine back to the tank. The fuel pump runs continuously once the engine starts, and continues to run as long as the engine is running and the ignition key is on. The pump may run at a constant speed, or it may operate at a variable speed depending on engine load and speed.

Does an electric fuel pump need a return line?

A return, while not necessary, is certainly nice to have as it makes the fuel pump’s life much easier. It keeps the fuel pump from fighting dead head pressure and that will make the pump ultimately last longer.

What are signs that your fuel pump is going out?

Seven Signs Your Fuel Pump Is Going Out

  • Sputtering Engine. Your fuel pump is telling you something if your engine starts to sputter once you’ve hit the top speed on the highway.
  • Overheating Engine.
  • Low Fuel Pressure.
  • Power Loss.
  • Surging Engine.
  • Gas Mileage Decrease.
  • Dead Engine.

How much horsepower will a 255lph fuel pump support?

A 255lph pump delivers about 410lb of fuel per hour so that’s enough to feed about 750 crank hp with forced induction (assuming 0.55 BSFC) and 900 crank hp NA (assuming 0.45 BSFC).

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Can a fuel pump be too big?

As long as the regulator can dump enough fuel back to the tank to keep proper pressure under times of low fuel demand, you’ll be fine. No such thing as too much pump as long as you have a big enough regulator.

Can you pull fuel through an electric fuel pump?

After a few seconds of power the switch is turned off and the engine started. This of course would require an electric pump, that the mechanical one could pull fuel through. Positive displacement pumps may not allow this. Pumps as listed don ‘t specify weather fuel could be pulled through.

Does fuel pump increase horsepower?

The technical answer is yes; fuel injectors can add 10 extra horsepower at peak. However, for some car owners, that minimal difference does not offset the increased cost and complexity of switching to fuel injectors or upgrading the existing stock fuel injectors.

Do carbureted engines require a high pressure fuel pump?

A fuel pump is not necessarily required for the engine to function. The low-pressure fuel needed by a carbureted engine can be supplied simply by mounting the tank higher than the carburetor and allowing fuel to feed with gravity.

What happens if fuel pressure is too high?

Too high of pressure may result in, over fueling of the engine. As a result, this can lead to a rough running engine; poor fuel mileage, and black smoke coming from the exhaust. If your regulator is going bad, your car could display several different symptoms.

Can a mechanical fuel pump make too much pressure?

The fuel delivery system uses a mechanical fuel pump that provides the lower level of pressure that a carburetor operates on. Using the wrong fuel pump that delivers excess pressure can cause problems ranging from poor performance and lower gas mileage to flooding and carburetor damage.

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Will too much fuel pressure to CARB symptoms?

The symptom of too much fuel pressure is that the bowls over flow. The pressure is too high and it pushes the needle off the seat, pushing the float down into the fuel. You will see fuel over flowing from the carb coming out of the vents. The engine will stall or catch on fire if your luck runs out.

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