Cummins won't start when hot - Diesel Bombers



24 Valve 2nd Gen Dodge Cummins 98.5-02 Discussion of 24 Valve 5.9 Liter Dodge Cummins Diesels with VP44 Injection Pumps
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Old 11-09-2009, 11:32 AM
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Default Cummins won't start when hot

The truck runs great and starts perfect when cool, but run it for a few minutes and it won't start once I shut it down.

I have replaced 2 lift pumps, 2 injector pumps, MAP sensor, and fuel tank pick up and filter, the only thing accomplished is messing up the fuel guage. Now I run out of fuel at a 1/2 tank.

A match and 20 gallons of gas are starting to sound good and cheaper.
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Old 11-09-2009, 03:08 PM
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** Please post questions in the correct forum **



1) Do you have a fuel pressure guage - absolute must on a 24V. Truck shouldnt leave your driveway without it.

2) Stock lift pumps are junk - dont waste your money on them

3) Have you scanned for codes?
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Old 11-09-2009, 03:12 PM
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No guage, but will get one.
Code machine lights like a christmas tree, but did not get them from the mech
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Old 11-09-2009, 03:13 PM
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Hard starts when warm are one of the classic signs of VP-44 failure. Notice and white smoke (when warm)??

Need codes if you are looking for advice. Good luck.
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Old 11-09-2009, 03:13 PM
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need to check fuel pressure
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Old 11-09-2009, 03:31 PM
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codes are going to be a must. it sounds like the vp has gone bad. throw the stock lift pump away and get an airdog and a pressure gauge.
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Old 11-10-2009, 04:08 AM
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Hard hot starts are the classic 2nd step of the vp44 - first step stock lift pump fails then without pressure guage - the injector pump vp44 starts hard starting then soon wont start at all. Once you put on guage get an airdog or fass and you will be a happy man. BTW if you need to change out the vp44 (you will) I have the tool to remove it and will loan it too you if you promise to return it. It is really kinda fun to do but can be stressful too. Also the screen on the fuel tank pickup bottom is really restrictive - engineer something better- I used a much larger heavier duty screen after the aftermarket lift pump install.
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Old 11-12-2009, 01:08 PM
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It was the VP44. Thanks all. I don't know why or how I got 2 bad ones in a row, but I know why I have a new mechanic.
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Old 11-12-2009, 02:23 PM
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good to hear. glad you got the beast running
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Old 11-12-2009, 02:30 PM
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Did you order a fuel pressure guage?
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