First, I'd guess you have the fuel pump in a position where it is pushing the gas, not trying to suck the gas(it needs to be were gas flows to it). Second, make sure it is well grounded. Third, there is two types of pumps, one is square and pulses to pump. The other type has a round body and actually has a rotor type pump that pumps a more constant flow. Hope that one of these points helps resolve your pump issues.