Aluminum Fuel Tank Project / EFI Fuel Cooling

To get a feel for whether the heat comes from the pump or the exhaust & hot engine bay, calculate the electrical power into the pump: P = I x dV. Ex. if it is drawing 10 A, P = (10 A) * (12 V) = 120 W. That energy is going into the fuel. I expect your pump draws ~2 A steady-state. It is a bit hard to measure such currents. Easiest is a clamp-on DC current probe. I just bought some for work at $440 ea. For home, I bought an earlier F.W. Bell one for $15 on ebay. See why I like ebay?