Cummins problem.........sorry - Ford Powerstroke Diesel Forum
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Old 01-15-2010, 07:55 AM
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Cummins problem.........sorry

My buddy who is not too mechanically inclined just called me and told me his 01 cummins dually is cutting out while cruising down the highway and it cuts out even worse when he tries to accelerate. Im assuming the lift pump is crap just like all the rest of them, but I wanted to get on here and make sure theres not some other possibilities that Im unaware of. Also, how do you test the lift pumps on these rigs to verify theyre bad?

p.s. Sorry about having to ask about a dodge but I figured all the good guys on here would be a better way to get info instead of trying to register on a dodge site.
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Old 01-15-2010, 08:12 AM Rookie

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Sounds like a lift pump. Not the best way to check but he could open the bleeder valve on the filter canister and check for fuel when he cycles the ignition. Only problem is the pump maybe weak and still produce a little flow but may not produce enough to build any pressure.
The other thing I ran into on my 01 was a fauly ignition key switch. Would only kill the fuel pump. Dash and everthing else would stay lit.
He'd be smart to get a psi gauge in there ASAP as it doesn't take much to wreck the VP44.

Last edited by Tonka Toy Killer; 01-15-2010 at 08:19 AM.
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Old 01-15-2010, 06:04 PM Fanatic

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key on, off, on, off, on. look at the odometer window, it will throw codes at you

I would look for a p0121,p0122. APPS issue.

Also check low side fuel pressure, no less than 10 at idle.

either of these could cause the problem. If you see a p0216 code, that is a timing issue inherent to the VP44 pump. It can be caused by low inlet pressure, so don't worry too greatly.

If you see p1688 or 1689, be prepared for a new VP pump in the near future.

Other thing is, if he's running a chip. Disconnect the chip completely, and see if the problem goes away. I have seen many problems with the VP44 trucks rectified, by simply removing a glitchy performance box.

Good luck
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