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Fuel gauge stepper motor or sending unit?

 
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crawdad
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PostPosted: Sat Nov 18, 2017 5:31 pm    Post subject:  Fuel gauge stepper motor or sending unit? Reply with quote

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.
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bigdog60
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PostPosted: Sat Nov 18, 2017 9:01 pm    Post subject:   Reply with quote

Not being this smart at these things..I would say it's the sending unit. Alcohol in the fuel seems to be playing heck with them.

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crawdad
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PostPosted: Sat Nov 18, 2017 9:37 pm    Post subject:   Reply with quote

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.
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bigdog60
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PostPosted: Sun Nov 19, 2017 8:09 pm    Post subject:   Reply with quote

The back of the rear seat needs to be removed for easy access.

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crawdad
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PostPosted: Mon Nov 20, 2017 11:57 am    Post subject:   Reply with quote

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?
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bigdog60
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PostPosted: Mon Nov 20, 2017 10:24 pm    Post subject:   Reply with quote

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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crawdad
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PostPosted: Mon Nov 20, 2017 10:29 pm    Post subject:   Reply with quote

I'll likely install a new pump assembly since there's 275K on it now and we put 145K of that on it and never put a pump in.
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bigdog60
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PostPosted: Mon Nov 20, 2017 10:30 pm    Post subject:   Reply with quote

http://impalahq.naioa.com/


This mite help. In the How To Section

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crawdad
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PostPosted: Tue Nov 21, 2017 12:07 am    Post subject:   Reply with quote

Very helpful. Thank you!
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Frank
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PostPosted: Tue Nov 21, 2017 4:20 pm    Post subject:   Reply with quote

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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crawdad
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PostPosted: Tue Nov 21, 2017 5:15 pm    Post subject:   Reply with quote

Yes, thanks. I do have the access panel and, at 275K, will replace the pump as well.
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bigdog60
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PostPosted: Wed Nov 22, 2017 6:31 pm    Post subject:   Reply with quote

Frank wrote:
GM started omitting the fuel pump access panel at some point during production to save money and I'm not sure when.


That would be 2005...Don't ask me how I know...lol

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