02 5.9l injection pump issues - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 2 (permalink) Old 12-05-2014, 03:19 AM Thread Starter
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02 5.9l injection pump issues

My uncle has a 2002 2500 5.9l Cummins. He has about 170000 miles on the truck. Up until now he has not had any issues with the engine at all. He has always gotten around 22 MPG. Recently his mileage has dropped to around 11 not towing or hauling. My question is where should I start looking for issues. I have heard about the issues with these injection pump and also would like to know if there is a way I can diagnose a bad pump, or will the truck even run if the pump is bad. Any help here would be great. Thank you in advance.

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post #2 of 2 (permalink) Old 07-18-2015, 05:46 PM
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I have gone thru 2 injection pumps in about 275K, but I have never seen the mileage drop that low not towing or hauling. Check the air cleaner and turbo. If the turbo is getting worn, you will not get enough air causing, smoke, and poor mileage.
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