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

10

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.

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.

10

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.

1 people found this helpful.

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

Your Answer:

2500

Looking for a Used 2500 in your area?

CarGurus has 2,192 nationwide 2500 listings starting at $14,962.

Postal Code:

CarGurus Experts

  • #1
    Rmj1126
    Reputation
    1,470
  • #2
    ARR1281
    Reputation
    510
  • #3
    terrelldspaulding
    Reputation
    440
View All

Find great deals from top-rated dealers

Search

Related Models For Sale

Used Ford F-250 Super Duty
24 Great Deals out of 1,201 listings starting at $8,995
Used Chevrolet Silverado 2500HD
18 Great Deals out of 1,279 listings starting at $9,990
Used RAM 3500
43 Great Deals out of 2,387 listings starting at $6,777
Used RAM 1500
457 Great Deals out of 15,784 listings starting at $5,000
Used GMC Sierra 2500HD
13 Great Deals out of 1,617 listings starting at $10,800
Used Dodge RAM 2500
24 listings starting at $9,975
Used Ford F-150
321 Great Deals out of 15,103 listings starting at $1,712
Used Chevrolet Silverado 1500
195 Great Deals out of 5,967 listings starting at $2,975
Used Ford F-350 Super Duty
35 Great Deals out of 2,591 listings starting at $8,888
Used GMC Sierra 1500
143 Great Deals out of 7,206 listings starting at $3,950
Used Toyota Tundra
34 Great Deals out of 1,190 listings starting at $8,500
Used Dodge RAM 3500
28 listings starting at $11,500
Used Chevrolet Silverado 3500HD
10 Great Deals out of 891 listings starting at $19,495
Used Toyota Tacoma
57 Great Deals out of 1,080 listings starting at $8,708

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use. Content will be removed if CarGurus becomes aware that it violates our policies.