Quote:
Originally Posted by E53 4.8is
So the fuel pressure reg is under the hood? Did you troubleshoot the bad one forst or did you just replace it? Im going to have to check the pressure tomorrow when i jump the relay again. I guess the relay is bad as well. Its gotta be something todo with the electronics as i cant hear the pump click on when cer is turned to the first settinf or second but i so when its jumped.
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Everything I read suggested a bad fuel pressure regulator. It is part of the fuel filter. It worked out for me since I wanted to replace this anyway since I had no proof it was ever changed. I had nothing to lose doing since I think it is a best practice to replace the fuel filter no later than 100k miles. Every 50k is probably more ideal.
If you do this you have to go underneath.