I didn't ask what they did. I assume they opened up the filter head, saw that the check ball and spring were missing, put them back, test drove it and observed no problem, then said it's done.so what kind of testing did they do? return rate? does the truck have any smoke, or a miss when it drops rail pressure? could indicate a sticking injector
ive never seen this on a duramax however I have had similar things happen on 5.2 Isuzu's
And the real problem is?I'm interested to see what happens in the following weeks. I'm glad that your truck is not messing up at the moment, but I hate to tell ya that I think a lift pump is a band aid for your real problem. The pump is keeping extra fuel pressure and not letting your truck fail as it was before.
Injectors have never been touched.I think the lift pump is also a partial band aid to a larger problem
I bet your CP3 is worn out
What about the injector tubes or cups? Injectors ever been removed from the truck?
ironmangq:32672186 said:Stock filter is 4micron with a coalescing water separator built in. Cat filter is also a good filter but has no water separator so you need the dual kit to get that function. IMHO the stock duramax filter setup is better than many