WOW! You're trying to fix the problem I just discovered today! I have a '94 Chassis Cab (With a big tool body behind the cab). It has the 5.8L V8 and of course, dual tanks. I've dropped the rear tank to replace it. I wanted to move the truck using the front tank, and sprayed fuel all over from the disconnected rear fuel lines (not sure which one).

Subford, you seem to have a good handle on this problem! How should the OP and I go about trouble-shooting this problem? Left to my own devices, I'll start by seeing which line is spraying fuel, but I haven't yet figured out what I would do with that information!

Thanks in advance!