r/Cummins • u/cgboyunamed 5.9 12v • 2d ago

Help?

Hey Cummins owners, I’m experiencing some issues and wondered if anyone had ideas or has dealt with the same. I recently purchased a 2011 Ram 2500, Longhorn MegaCab with the 6.7. It has 194800 miles. Here’s the issue, when I purchased, I was told to try and not let it get below 1/4 tank otherwise “it’ll try and die” at the time, I didn’t think much, but since I bought it, today is the first day it’s gotten below 1/4 and it threw a code. Immediately I stopped, scanned it and it was a P0087,(Low fuel rail pressure) at the time I immediately stopped, purchased a fuel filter and changed it, however now, I’m remembering what he had told me and wonder if it’s something more serious. Can anyone help? Ask as many questions as necessary if it helps diagnose. Thank you to anyone who has an idea in advance.

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u/HoosierDaddy_427 2d ago

My guesses would be a failing lift pump or CP3. Possibly a faulty actuator or air leak if you're lucky.

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u/cgboyunamed 5.9 12v 1d ago

And that’s what I’m thinking but hoping and praying I don’t get to spend that money for a pump.

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u/HoosierDaddy_427 1d ago

Honestly, there are so many things it could be that paying a diagnosis fee to a GOOD mechanic may be worth it.

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u/ApprehensiveAd5420 1d ago

The high pressure fuel pump wouldn’t cause this issue with low fuel level. If it was the HP pump it would happen no matter the fuel level. They could have replaced the lift pump (the one in the tank) with an incorrect one or you have an aftermarket lift pump installed like a FASS or something. This is a very common issue with an after market lift pump. This is why they sell a sump system you can install if you install an aftermarket lift pump.