GMC Troubleshooting Questions? Ask a Mechanic for Answers
HI there, I am Cam. Does this seem to be worse when it gets warm?Is there anything thing you can think of that makes it worse or better?
Did you relocate the Pump Mounted Driver from the side of the pump? Any wiring issues there? More hot than cold?
Does wiggling the wiring change anything?
Not a bad idea. Considering how vital the PMD is, and how often they fail, it’s a good idea.
This is not a common complaint, normally the pump failure is a stalling or no start issue.
The leaking exhaust you would hear though. Air in the fuel, Usually don't get that with a lift pump and if you are getting that pressure, its not as likely. I have heard though of lift pump failures sending debris through the system. Is there garbage in the fuel filter?
Ok, lets see what the new harness will do.
No, it should not.
Ok, reply at that time.
ok ( If you reply, I cannot proceed with other customers until I answer you). Talk to you tomorrow.