Quote:
Originally Posted by scotty68
do I have to replace the whole rail?
dont want to make a new post but, do you? I've read in the past you cant just buy the fpr itself.......
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You could try that and hope it works.
I would do a regular internet search to see if anyone has had the issue before and look on YouTube to see if there is a video with troubleshooting.
Not a diesel but this gives some idea on what you think might not be cause. This is on a chevy gasser that has a high-pressure fuel pump. It was taken to a shop, and they replaced the fuel pump, but it was still throwing a low-pressure code, and they called in another person with better scanners. He verified that yes, the pressure was too low.
He removed the new fuel pump and eventually pulled out the tappet and roller that actuated the fuel pump and found out that the roller and the tappet were badly worn, and neither were allowing the tappet to move as far as it was supposed to.
When those were replaced the new fuel pump worked fine and the pressure was normal.
For low fuel pressure you would think anything from the fuel tank venting system from the tank screen, any fuel pumps in-between the high-pressure pump, restricted filters on into the high-pressure pump and that regulator you mentioned could all cause the issue or any combination of them.
If you had a manual that covered that there should be a fuel feed pressure up to the high-pressure pump and of course a reading on what the fuel pressure relief does.