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  #1  
Old 07-12-2010, 09:02 PM
pokeyjoe pokeyjoe is offline
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Join Date: Aug 2009
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Default NEED HELP!!! 5.9 Cummins

I have an 03 3500 5.9. It runs great and when I stop at a light it shuts off. Sometimes it will shut off riding down the road. If it sit for a few minutes it will start up again. Seems to do it around a 1/2 tank and under. I've been told the pickup tube may be bad and needs to be replaced. COME ON GUYS I know someone out there has the answer.
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Old 07-13-2010, 09:32 PM
Dwtrk Dwtrk is offline
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Do you have any idea what the fuel pressure is doing? That would help you in your or someone elses diagnosis.
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Old 07-15-2010, 05:41 PM
pokeyjoe pokeyjoe is offline
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How do you check that?
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Old 08-29-2010, 03:01 PM
BenShelton BenShelton is offline
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Default 5.9 lift pump / fuel problems

Your problem sounds a lot like mine, one day at a light it just stooped and never started again. My 2500 had the external fuel lift pump and it died. Had to replace it but after that nothing stops it. I chose to go with an external FASS sysem over the factory in tank replacement pump. Now if you have already check your fuel pump and presure then just ignore my post. Hope this helps and good luck
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  #5  
Old 08-29-2010, 07:01 PM
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PorkChop PorkChop is offline
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my 2 gueses are fule pump and or filter. if it origional filter start there, it much cheaper part. if you have to pull the tank to get at bout (sorry not familiar as to where they are placed on the dieseles) then i would replace both at the same time for peice of mind...your there anyway
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Old 05-06-2015, 08:44 PM
dtrmmr dtrmmr is offline
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The high pressure fuel injector pump doesn't suck fuel from the tank ... it needs a "lift pump" to move fuel from the tank to the high pressure pump. The high pressure pump uses fuel for self lubrication. If the high pressure pump is starved for fuel, it will quickly self destruct and it is expensive. Therefore, it is a really good idea to install a fuel pressure gauge near the inlet to the high pressure pump. Both the original block mounted and replacement in tank fuel pumps from Dodge are relatively unreliable.

I had a problem very similar to what you are describing and it was caused by the lift pump beginning to fail and not providing enough fuel to the high pressure pump. You will need to install a fuel pressure gauge and/or get a mechanic to check the pressure to confirm whether this is the problem.

A clogged fuel filter and a problem with the in tank fuel pickup are also potential problems.

I replaced my in tank lift pump with an external fuel pump and filter system from FASS (950 GPH). I now have 15-17 PSI at the inlet of the high pressure pump. With the Dodge supplied in tank pump, I had a maximum pressure of 7 PSI and when the lift pump began to fail, the pressure would drop to 0-4 PSI as soon as I opened the throttle.
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