Welder Dave
Senior Member
I have a 1995 Topkick 6.0L gas with TBI. It has dual tanks and uses 2 different fuel pumps. The fuel pump doesn't come on when you turn the key. The gas was a little old so I drained it and got 2 new aftermarket fuel pumps. The passenger side pump doesn't have the electrical connector so needs to be modified slightly. Does polarity make a difference on a fuel pump? Also if one pump is bad will it affect the other one not working either in the fuel control or wiring? The drivers side tank appears to be the priority tank and wondering if the passenger tank even has to be used? Also wondering if the oil pressure switch controls the fuel pump in a Topkick? I wouldn't think so because normally the pump comes on for 2 or 3 seconds when you turn the key. Just trying to figure this stupid thing out. Put a distributor in last year and it was running great. Now no fuel. Very frustrating. Any help would be appreciated.