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rseibenick · 10-12-2022, 12:29 PM

Changed both filters . Both were black . Put a fuel pressure gauge on it . Took it out for a test. Cut them, open ad small black dots in the At 2000 had 28 PSI , when I got on it the pressure dropped to 15 . When I got off it cam e back up to 28. Now changing the overflow valve ,and see it that solves it. IF not, then the lift pump. Any other ideas. Thanks.

10-12-2022, 12:29 PM	#9
rseibenick Member Join Date: Dec 2002 Posts: 160 Likes: 22 Liked 20 Times in 7 Posts	Re: Cummins 5.9 12 valve mechanical expert Changed both filters . Both were black . Put a fuel pressure gauge on it . Took it out for a test. Cut them, open ad small black dots in the At 2000 had 28 PSI , when I got on it the pressure dropped to 15 . When I got off it cam e back up to 28. Now changing the overflow valve ,and see it that solves it. IF not, then the lift pump. Any other ideas. Thanks.