My 93 Silverado will not run after starting. I don't hear the fuel pump running, but I have power coming out of the fuel pump relay (grey wire). New fuel pump was installed about 10,000 miles ago. I understand that there is a oil pressure switch in the circuit that cuts off the fuel pump if it thinks that there is no oil pressure. Where is that oil pressure switch located? The Haynes book says near the oil filter, but I see no switch in that area (it is the usual place for it on most vehicles).

 

You need to see if you have power and ground at the pump. New does not always mean good. If you are missing a signal then look into the oil pressure switch. Always start at the end of the line first.

 

Yes, I understand, I am just trying to understand the whole situation before I get under the truck and start working on Saturday (raining hard here). I replaced the tank, fuel pump and all lines, filter, etc. myself about 10,000 miles ago, so I know what to look for there.

 

Assuming that it is 4wd and a 5.7 it is on the back of the engine kind of behind the distributor.