I can tell you I have run the Holley red pump and the black pump mounted in front of my gas tank as they are not lower then my tank and they have worked fine like that for over 20 years. Its not a lot of places to mount the electric pump lower then a stock gas tank when running full exh system as I do on my 63. My pump is even with the top of the tank right in front of my sending unit. And I have never had a problem with the Holley pump mounted there. Ron