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marpel

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marpel Enthusiast

marpel

Posted
Posted

I have a 2012 Sierra (with about 20 thousand kilometres) which I park in the driveway that has a mild slope. I have recently noticed that when I have parked facing uphill and start the vehicle, the needle will show about a quarter tank more than is actually in the tank and if facing downhill, will show about a quarter tank less. I can drive the truck for some distance (like miles) before the needle corrects itself. Or if I stop immediately on the level road once out of the driveway and turn off then start it again, the needle shows a correct amount. Doesn't seem to matter how full the tank is, although have only noticed it when tank at or below half a tank. Does not occur when parked on level ground.

 

I don't recall this happening with my previous GMC and am wondering if anyone else has this same issue and may know if this suggests a faulty piece of equipment. I have also only noticed it this winter so not sure if it may be temperature related.

 

Marv

Chris Senior Enthusiast

Chris

Posted
Posted

Mine does this too. Nose dawn it shows low. the float or sending unit for the fuel level must be in the rear of the tank

aflesch Enthusiast

aflesch

Posted
Posted

Mine does the same thing. There is a delay built into the gauge circuit so that the needle isn't bouncing up and down as the fuel sloshes around in the tank. It is normal. I also noticed on a recent road trip that after I fill up it will read full for about 75 miles and then suddenly drop to about 3/4 tank.

 

My Ford Exploder that I used to have did the same thing except that if I was below 1/4 tank the needle would drop all the way down and it wouldn't start. The fuel all ran to the front of the tank and couldn't be picked up by the pump. I actually had it do it while driving going down a steep hill. It actually stalled out while I was driving.

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