Bad ground

Asked by Mike Jul 11, 2019 at 02:59 PM about the 2002 Chevrolet Avalanche 2500 4WD

Question type: Maintenance & Repair

Fuel gauge stop working they can it's a bad ground.
Where would the ground for the fuel pump be

2 Answers


Note the diagram for fuel gage, it shows more than one sending unit, so pick yours. As you can see, 250 ohms is full and 40 ohms is empty. At least that's the way I read it. You can get a couple resistors representing those values or close to it. You can splice resistor between proper wire colors, turn on the key, If the gage reads properly with each resistor, the problem is the sending unit in gas tank. If the gage still doesn't read properly, I believe either the instrument cluster or wiring circuit is faulty. The fuel gage sending unit sends info to pcm, the pcm sends serial data to instrument cluster, tells cluster what to do with fuel gage. Some makes and models, the instrument cluster may do a self test when you first turn on the key, the gage needles sweeps a little. They will sweep w/o input from sending units. So if all gages sweep except fuel gage, I think the instrument cluster is faulty. Just my opinion. Have I ever been wrong, yes. good luck


Just to add, if vehicle starts and runs, I don't believe pump/sending unit has a ground problem?

Your Answer:

Chevrolet Avalanche Experts

  • #1
  • #2
  • #3
View All

Find great deals from top-rated dealers


Related Models For Sale

Used Chevrolet Silverado 1500
116 Great Deals out of 10,436 listings starting at $4,330
Used Chevrolet Tahoe
27 Great Deals out of 773 listings starting at $6,871
Used Ford F-150
286 Great Deals out of 12,438 listings starting at $3,695
Used Cadillac Escalade EXT
11 listings starting at $9,995
Used GMC Sierra 1500
103 Great Deals out of 9,754 listings starting at $2,500
Used Dodge RAM 1500
9 Great Deals out of 318 listings starting at $2,500
Used Cadillac Escalade
18 Great Deals out of 631 listings starting at $7,890
Used Chevrolet Suburban
17 Great Deals out of 418 listings starting at $6,000
Used GMC Yukon
19 Great Deals out of 913 listings starting at $4,395
Used Toyota Tundra
23 Great Deals out of 1,335 listings starting at $7,995
Used Chevrolet Silverado 2500HD
21 Great Deals out of 1,441 listings starting at $6,750
Used Toyota Tacoma
55 Great Deals out of 2,086 listings starting at $6,500
Used Chevrolet Camaro
37 Great Deals out of 933 listings starting at $9,870

Used Cars for Sale

2013 Chevrolet Avalanche For Sale
13 listings starting at $14,643
2012 Chevrolet Avalanche For Sale
18 listings starting at $12,792
2011 Chevrolet Avalanche For Sale
3 Great Deals out of 18 listings starting at $11,995
2010 Chevrolet Avalanche For Sale
10 listings starting at $8,499
2009 Chevrolet Avalanche For Sale
9 listings starting at $7,950

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.