1998 Cadillac Catera - no power on fuel pump fuse

cadillac
catera

#1

no power on the fuel pump fuse, relays are good


#2

I’ll admit I don’t know much about it but you need a schematic to see what’s in the circuit but isn’t it direct power to the fuse panel? At any rate when turning the switch, the computer powers up the pump for a few seconds then shuts down if there is a no start. Also the oil pressure sensor has a second set of contacts that will disable the pump if pressure is lost. Others that know more about it may disagree, but can you provide more info?


#3

Most power train computers will not power up the fuel pump unless they detect the engine is turning. A failed crank sensor could be the problem.


#4

You’re nearly correct, George

If the pcm doesn’t soon detect a signal from the ckp sensor, then the fuel pump will be de-energized

But if you just turn the key to on position, the fuel pump WILL be briefly energized


#5

Not saying it doesn’t normally occur w/ OP’s vehicle, but that doesn’t happen on my Corolla or my prior VW Rabbit.