[Elbert]

You need to understand why you are gettting the troublecode for fuel pump relay...and fix that. There are complete trouble code diagnosis charts in the shop manauals. YOu cannot have hard code (trouble codes) set in the ECM and not expect problems.

Trouble codes have to be fixed....sure when you get into custom wiring hanresses and stuff you are going to have some wierd problems. Make sure you don't have a simple cut wire or relay that needs to be replaced. Find out what that code says to check, and work your way through that.

I mean if you have a code that speaks to fuel, ign, spark, or timing....you will have to get that fixed before it's going to run right or run at all. The ECM is the brain of the vehicle...the sensors tell the ECM what's going on... if one of the sensors fail or wires get cut...the ECM cannot operate correctly.

I would simply replace the fuel pump relay, and clear the codes and see what happened then...if I did not have a shop manaual, I'm sure you can get the relay at NAPA or some other store. Then of course if that does not work...you've got to figure out what's causing the ECM to set the fuel pump relay trouble code.