Posted: Sat Nov 18, 2017 5:31 pm Post subject: Fuel gauge stepper motor or sending unit?
2003 Impala 3.4L base
Fuel gauge is erratic. When I check it with a Tech 2 it sweeps smoothly from one end to the other. Does this indicate that the stepper motor is ok and that it's likely the sending unit on the pump is bad? Thank you.
Thanks, leaning that way too. If the sending unit, would you know if the back of the back seats fold down? I don't see how they possibly could in my car. I've got the trunk access to the fuel pump but a lot easier with the seatbacks out of the way.
Thank you. A little more research and I've discovered how to remove the seatback. I suppose, at this point - and we've had this erratic gauge for years - that no additives, such as the GM Fuel System Treatment Plus, would help? And I wonder if that's similar to other fuel treatments out there such as the Techron?
The only GM product I've had luck with is the Engine Oil Supplement to quiet down noise lifters. I think I read somewhere that the sending units just wear out. If you do remove it, you may be able to see if there is any crap on it.
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GM started omitting the fuel pump access panel at some point during production to save money and I'm not sure when. If you don't have it, you'll have to drop the whole tank to replace the level sender which is a pain; I have replaced the level sender in my car two or three times now.
If you're there, you might as well replace the pump as well. I have been fortunate to never have a fuel pump die on me because I always replace it when I replace the level sender. Give Morad Parts a call or look at their eBay store.
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