Lost fuel pump/Lift pump

engweld22 · 2026-04-29T12:51:27-0700

I have a 2023 2500 Cummins with 71k miles. I went to start the truck up the other day and it started, i ran it around town came back and shut it down. Went to go start it up again and it cranked until i hit the start button again. I did the method for priming the fuel system after changing filters, no sound from the fuel tank. I checked the fuse, it was fine. Swapped the fuse and tested again to double check. Didnt get it running again. I then let it sit for a week and i hopped in and i could hear the fuel pump whirring again. took it for a drive and it was fine. i had alpha going and recorded my fuel rail pressure and was getting 900-1000 bar, which is good, my HPFP is working. Shut the truck down, went to start it again and the fuel pump made no whirring sound and then it cranked and cranked and i shut it down. So i think my in-tank fuel pump is bad.

Can i get a recommendation for either going to an aftermarket fuel pump system or in-tank pump?
Since i may be dropping the tank if i go with an OEM equvivalent, would it be preduent to just replace it with a higher capacity tank and get the higher capacity fuel pump?

Thoughts, arguments?

engweld22 · 2026-04-30T04:54:04-0700

So I was doing some research in the fuel pumps. Seems that there are 2 part numbers 05145571AA which is replaced by 05145571AB. Doing some research, the orignal part number AA has a GPH of 80-90 while the replacement is approx. 45. Granted this is from the Google AI and should be taken lightly, but is usually pretty accurate. Does anyone have the TDS for these systems? If not, what would be the difference if i purchased a Delphi FG1943 unit for half the price as that claims a 45 GPH as well? Has anyone had any experience with this?

BighornHDRam · 2026-04-30T07:42:12-0700

If you are dropping the tank I would be installing one of the Fleece units along with upgrading the fuel tank size as well while you are at it.

Fleece 11-24 Dodge PowerFlo In-tank Lift Pump Assembly

Enhance fuel delivery in your 2011-2024 Dodge with our PowerFlo In-tank Lift Pump Assembly. Prevents fuel starvation and supports increased horsepower.

www.fleeceperformance.com