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  #1  
Old 04-25-2011, 12:26 PM
K. Meharg K. Meharg is offline
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Default '03 Fuel problems?

I have a '03 Ram 3500 quad cab, with a 5.9 Cummins and a 4:10 gear. The truck is a pulling nut, moving gross weights of over 20,000# on many trips. I started having what I thought was a fuel problem last December, but to date we have not been able to track it down. The truck will run perfectly for 100 or more miles, sometimes up to 500, and then it will seem to begin starving for fuel on big grades, going way down on power. It seems that when it starts this, the longer you run it the worst the problem becomes, sometimes slowing to an absolute craw going uphill. You can pull over, shut it off for a few minutes and the problem will go away for a period of time, or in some cases, will disappear altogether for the duration of the trip.

I have had the truck in the shop on two different occasions, with the computer showing no codes whatsoever. I have been told that it could be the fuel transfer pump, or the computer. Any ideas?
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Old 04-28-2011, 11:07 PM
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Pull Ya Pull Ya is offline
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Install a fuel pressure gauge. Check your fuel filter. The lift pump may be going out, but usually they just crap out--now it works, now it doesn't.
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Old 04-29-2011, 03:14 PM
K. Meharg K. Meharg is offline
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Thanks for the reply Pull Ya! I have changed the fuel and air filters a number of time with no result. Fuel pump? Maybe, but I feel the same as you, it should either work or not work, not heal itself during a brief stop. The fuel pressure gauge is an idea, may go ahead and do just that. Someone else suggested that it could be a bad fuel line that is partially collapsing during high fuel usage periods

This problem is about to make me start pulling out my hair!!!!!!!!
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Old 04-29-2011, 03:41 PM
jgshannon jgshannon is offline
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Yeah, I would think it would be the fuel pump going out. I would assume the fuels moving around on those large grades and making it work harder, not that I'm a mechanic by any means lol.
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