[Richard Hudgins]

Snake Farmer,

I have never understood the requirement for massive fuel pumps on auto engines.

You say that you have a 750 hp engine. Let's assume that you are running a little rich at a brake specific fuel consumption of .5 lbs per hour per HP.

Therefore, at peak power of 750 you have (750hpX.5lbs per hour)=375 lbs per hour of fuel usage.

Assuming a gallon of gasoline weighs 6.5 lbs. (Actually varies between 5.8 and 6.5) You will need to flow 57.69 gallons per hour to the engine to support this HP.

Note: You only need this much flow at the 750 power output level. Meaning wide open throttle at at peak output. If you are driving down the road at 60 mph, you are probably only using 75 hp. Therefore you only need 5.76 gallons per hour. (this is also a pretty bad fuel mileage of 10.41 mpg.)

It would seem to me that you could certainly just use a in-tank pump as many of these units are 75gph and above.

I know that everyone is thinking that the above is BS. But lets look at Winston Cup cars. They have about the same HP as is mentioned above. They use mechanical pumps in the range of 90>120 GPM. Maybe they know what they are doing.

Lets just drop the BS from the folks who wish to sell expensive bits and look at the reality of fuel requirements for a given HP range.