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New cluster in, but new fuel gauge hinky


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I wonder if the cluster came from a truck with a 34 gallon tank, as it now reads above full for a lot longer than the old one, and when the Low Fuel alarm comes on, it is almost too late to get to a gas station.

Does the 34 gallon tank have a different sender than the 26? Or do they just tell the DIC what tank is on the truck and it adjusts accordingly?

I suppose I could just add some resistance in series or parallel with the sending unit to adjust it. Anyone know the expected resistance for full, and empty?

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I wonder if the cluster came from a truck with a 34 gallon tank, as it now reads above full for a lot longer than the old one, and when the Low Fuel alarm comes on, it is almost too late to get to a gas station.

Does the 34 gallon tank have a different sender than the 26?  Or do  they just tell the DIC what tank is on the truck and it adjusts accordingly?

I suppose I could just add some resistance in series or parallel with the sending unit to adjust it.  Anyone know the expected resistance for full, and empty?

 

 

 

 

26 gallon tank: remaining gal fuel level

E = 197-250 OHMS 0-3.1 gal 0-13%

1/4 = 150-190 OHMS 8.7 gal 30-35%

1/2 = 118-140 OHMS 13.5 gal 50-55%

3/4 = 83-110 OHMS 19.7 gal 72-78%

FULL = 40-66 OHMS 24.5 - 25.9 gal 88-100%

LOW LIGHT COMES ON AT 208-218 OHMS 4.3 gal 11-17%

 

34 GALLON TANK

E= 196-250 OHMS 1.2-4.1 gal 4-14%

1/4 = 155-195 OHMS 11.6 gal 30-36%

1/2 = 117-151 OHMS 18.6 50-58%

3/4 = 80-112 OHMS 25.7 gal 70-80%

FULL - 40-62 OHMS 32.6-33.4 88-99%

LOW LIGHT COME ON AT 218-229 OHMS 6 gal 11-14%

 

There is also a 31 and 37 gallon tank for the Suburban (if your cluster came from one of those)

 

Info from GM service manual

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Well, after crunching those numbers, there isn't that much difference. Certainly not enough to reflect what I am seeing. There would be about a 1 gallon difference when the low fuel light comes on, assuming the DIC can be programmed to tell the fuel gauge what size tank it is reading.

Guess I can learn to live with it, as long as I have a trip odometer to back me up.

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