fuel pump issues - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 9 (permalink) Old 02-17-2014, 01:22 AM Thread Starter
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fuel pump issues

I know an older gentleman with a 98 Dodge with the 24 valve Cummins. He drove it over 100,000 miles on the original fuel pump. It went bad and was rebuilt?/replaced? This pump lasted only a couple thousand miles. Repaired again. Only lasted another couple thousand miles. He has been told that he no longer drives it much therefore the pump will not last very long. I find that hard to believe. Any help would be greatly appreciated. I know about big diesels but I do not have a clue about a 5.9 Cummins. Thanks
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post #2 of 9 (permalink) Old 02-17-2014, 01:46 PM
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The replacement VP44 only lasted a couple thousand miles? Odd. There are questionable suppliers/rebuilders out there.

First question you need to get a good answer to: Does the lift pump work? First cause of a 44 death is usually a bad lift pump. Crack the feed going into the VP44 while turning it over. Next area to inspect is the filter and filter housing. Dirty fuel will kill a 44 quickly. Check the lines and see if there is a leak. Who did the work when it was replaced?

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post #3 of 9 (permalink) Old 02-17-2014, 04:49 PM Thread Starter
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As I said I don't know jack about this engine. Does it have a lift (transfer) pump in addition to an injection pump? I will stop by his house tonight and get some answers for you.
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post #4 of 9 (permalink) Old 02-17-2014, 05:32 PM
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One of the best resources for VP44 trucks: http://articles.mopar1973man.com/2nd...25-fuel-system
Lift pump



-Josh-
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post #5 of 9 (permalink) Old 02-17-2014, 07:00 PM
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In a freightliner the lift pump only works for the first 15 seconds then shuts down and the VP44 draws the fuel.
Cummins took the best engine a 5.9 with a P7100 and made it one of the worst when they added the VP44. I have seen brand new ones fail early and often.
Whenever we use to have a problem with a VP44 we would pull the carter pump off and dismantle it, to clean the screen. The VP44 does not last when the it has excessive fuel restriction.
I use the same carter fuel pump in my loader it has a Yanmar engine and the lift pump went bad I wired the Carter in to run full time it works great in that application.
Just a thought!

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post #6 of 9 (permalink) Old 02-17-2014, 09:09 PM Thread Starter
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I cracked the banjo nut on the fuel line from the lift pump with the engine running. It seemed to have good pressure. I cracked the outlet nut and fuel came out. I did not open it very far because I did not want to get air in the system and make the engine stall. After looking at the engine I am really shaking my head. From my conversations with Roy I cannot believe a shop would charge $2000 to r & r the lift pump. Am I missing something? Roy said the shop removed the starter to change the pump. I can see where that would be necessary to change the lift pump. I thought all along he was talking about the injection pump being rebuilt. I drove the truck and it ran fine. Roy says it will be going along and slow to 30 mph. Put the pedal to the floor and nothing happens. Slam the pedal to the metal so the truck will drop down a gear and it picks up and goes balls to the wall. The problem is intermittent. I appreciate the internet diagnosis. I am sure we will figure it out with your help.
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post #7 of 9 (permalink) Old 02-17-2014, 09:21 PM Thread Starter
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Thanks for the link. Now I have a source for self education. Now I can associate a part number with a part. After looking at the link and diagram I tend to think the injection pump was rebuilt and the lift pump was swapped out as well. It goes with what I understood Roy to say. I sure hate to tell him pump failure can be common. In regard to his question: he was told the truck sitting a lot is the cause of the problem. Can this even be possible? Went 105,000 on the factory pump. Now has 121,500 miles and is going on its third replacement pump.
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Sitting is not good for anything mechanical. But I wouldn't lay that as the culprit. Add some lubricant to each tank. I use 2 cycle from wally world in mine. It's cheap and available everywhere. A pint per tank is what I use.

It's odd that they dropped the starter. Can't even imagine why they would do that. The barring tool goes on the opposite side. I would recommend taking it to a different shop.

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post #9 of 9 (permalink) Old 03-03-2014, 12:18 AM
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Just my opinion, get a better fuel system than stock, none of the pump supplier I use will warranty a VP44 unless you install a new lift pump and fuel filter, and most are requiring the new fuel pump be in the tank. The frame mounted units just fail too often.
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