What are things to check when my 98 Cummins 12v starts using a lot of fuel?
10

Asked by rdowdasat Nov 12, 2017 at 06:22 PM about the 2011 RAM 2500 SLT 4WD

Question type: Maintenance & Repair

I have a great running 98 Ram Cummins 12v but it started using almost twice the fuel.  I have been getting 20 mpg but now can't get 200miles on a half tank.  What are things I should check that would have failed?

5 Answers
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rdowdasat answered 6 years ago

Oil looks good smells good. Oil level staying the same. No signs of leaks visibly following and touching all the fuel lines. Cannot smell any diesel. No black smoke out the tail pipe. Engine still have lots of power. No knocking from engine.

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F_O_R answered 6 years ago

Carefully check the fuel economy by filling the tank and noting the miles. Do the same thing every time you fill up and calculate the fuel economy. I don't know the tank size but 200 miles on a half tank might be around 20 mpg.

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10

rdowdasat answered 6 years ago

This is a 32 gal tank. I was getting 19mi in town and 22mi on the highway. Now I'm getting 12mi in town and not much better than 12mi on the highway.

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F_O_R answered 6 years ago

I don't know but I found this trouble shooting guide that might help you. ------------------ http://dodgeram.org/tech/dsl/troubleshooting/12v_trouble.htm

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