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Old 05-26-2014, 04:55 PM   #1
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Unhappy Cummins fuel pump problems---------

I bought a 2001 HR Ambassador with a 300 cummins diesel pusher year before last. The Motorhome only had 35,000 mi on it & that was a big selling point for me. Anyway, after putting approximately 2000 miles on my unit the fuel pump went bad. I had it replaced at Cummins Crosspoint in Knoxville, Tn. Everything was fine for about 4,000 miles & now the fuel pump has failed again. My question is has anyone else experienced this with their Cummins? I heard of fuel pump problems before I purchased but I thought it was on the 330 cummins.
I guess my question is if anyone else has experienced this kind of problem with their Cummins. At $5,000 a pop to replace, I'll trade & go to a gas unit. I can't afford this kind failure just for the ride & power of a diesel.

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Old 05-26-2014, 05:17 PM   #2
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At a 5K replacement cost, it was probably the injection pump that failed. Some of Cummins replacement parts are remanufactured and the injection pump I'm sure is one that would fall into that category. ALL Cummins replacement parts, either new or remanufactured come with a 12 month or 12000 mile replacement warrantee. If your new pump failed within that time frame it should be replaced free of charge. If you are out of that warantee period, a phone call to Corporate Customer Service may prove beneficial. While they probably will not cover the entire cost of replacement that may cover some of it. Nothing ventured nothing gained, and the call will probably be free with a 1-800 number. Have all your information at hand when you call.


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Old 05-26-2014, 05:43 PM   #3
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Dan, I had it towed back to Cummins & they said the warranty was up as it had been 18 mos. The kick in the teeth is that they said they don't work with extended service contract companies anymore & that they would repair it but I wouLd be billed & it was up to me to work with the ESC company. I said no thanks & had it towed to Freightliner of Knoxville as they work on Cummins.
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Old 05-26-2014, 06:05 PM   #4
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I have an ISB275. It has a lift pump that delivers fuel to the injection pump. As the lift pump ages the lift pressure decreases and when it reaches 5 PSI your in danger of losing the injection pump because it requires over 5-6 psi.

The lift pump runs a little over 200 new so if the pressure drops you should replace it. A lot cheaper than an injection pump.

Another thing that will wipe out an injection pump is air in the fuel. The injection pump delivers pressures of about 15000 psi so any air acts like bullets both in the pump and injector. On my unit it is easy to get the air out.

Quite a while ago I modified my lift pump fuel line to include a 0-15 guage sensor so I could readout the pressure at the dash. When the pressure got down to 6 while under load, I replaced the pump. 200 is cheaper than 5K.

The info is just for an ISB.
98 Endeavor DP, ISB275
RX300, Falcon II hitch, BB Vantage Select
VMSpc, 2002 Grey Ford Powerstroke
TST 507 w/ 10 Sensors
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cummins, fuel

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