I know this might seem simple minded to you pros, but I have a fuel pump question about a 88 ¾ ton Suburban with 5.7, TH400 and TBI. Where is the fuel pump? I only see two wires going into the top of the tank… a purple/white and grey. I assume that since there are only two going in, it’s for the fuel sender. Wouldn’t there be 4 wires if there was also a pump in there? Thanks, Alex