Originally Posted by 87monte385
Im running a holley electri fuel pump on my motor, and my $25 summit regulator is reading all over the place and i cant get it to adjust. also gas is going into my carb if i just run the pump without the motor running, bad regulator?
Probably a bad regulator. But, the best solution with an electric pump is a by-passing regulator. Electric pumps put out the same amount of fuel whether the engine is idling or at WOT; unlike a mechanical pump whose out put is proportional to engine speed thus fuel consumption. It is not good to dead head an electric pump which will happen almost at idle and certainly if this thing runs with the engine off, which is incorrect wiring, it needs to be off when the engine doesn't run for safety's sake. However, if it's dead heading it beats the fuel to froth and overheats the fuel and the motor reducing pump life. Back in the good ole days of the Bendix diaphragm pump, these things shut themselves off when the line pressure reached about 4 PSI, these more modern hi capacity turbo impeller pumps do not, thus the need for a bypassing regulator if that's the type pump you're using. The big thing you need to do is to wire this pump so it doesn't run if the ignition isn't on, there should be directions with the pump on how to do this.