Lift pump?

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(01-27-2019 )Konstantin Wrote:  

(01-27-2019 )Evotrucker Wrote:  We have the same Volvo! so my issue started just like yours.... turned out the gear pump was going out. After replacing the gear pump i noticed that i wasn't priming the system enough to get all the air out when i was changing out the fuel filters.... so now i do 5 or 6 primes just to make sure all air is out and then i check if their are big bubbles coming out of the IFSM with a compucheck.

what port on a pump you use to check for bubbles? i see there is 3 of them. could i buy this fitting in any store or it is from cummins only? thank you

There is good video on Youtube part1 and part2 to understand 871 fuel system.
Compucheck connector with clear tube you can buy from cummins or online. If fuel line is empty after night it definitely not air tight. Could be filter housing cracked, fuel line connections not tight, pickup tube cracked(if it's not Volvo), water separator.
Refer to quickserve how to diagnose fuel system.
https://www.youtube.com/watch?v=HvvFElrc5ak