Fuel systems for drag cars

pittsburghracer said

A lot of people run a return but Dont know how to run a return. To properly run a return to the tank the fuel has to enter above the fuel level and be expelled under the fuel level so you don’t put air into the fuel. Fuel systems don’t like bubbles. Most guys just dump the fuel on top of the fuel in the tank or cell.

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Not true. I tested that. In a 3 gallon cell.

Every railbird that saw it told me how stupid I was.

So I spent an assload of money to put the fuel in below fuel level. It did zero.

Unless the tank is almost out of fuel it won’t make any difference.

And that was with MFI, which sends more fuel to the tank as rpm goes up. With an electric pump it returns less fuel as rpm (and power) goes up.