Gas gauge not working

Tiny
ZAKARIYA
  • MEMBER
  • 2001 BUICK CENTURY
  • 120,000 MILES
Gauge either shoots to full, or drops down to empty. Does the sender have anything to do with the gas tank and specifically the FLOATER? I was told the the fuel pump and gas tanks floater is the cause of this issue.
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Wednesday, March 14th, 2012 AT 1:07 PM

7 Replies

Tiny
KEN
  • ADMIN
Hey ZAKARIYA,

There is a fuel level module which is the BCM that could be bad, let's try to unplug the harness to the tank and see if it drops down to zero. That would indicate a bad sender which is the most common cause.

Here is what you are in for when changing the fuel pump module out.

https://www.2carpros.com/articles/how-to-replace-an-electric-fuel-pump

Here is a wiring diagram that will show how the system works. Please check the sender ground circuit I have seen these go bad he is guide to help.

https://www.2carpros.com/articles/how-to-check-wiring

Please run some tests and get back to us so we can continue helping you.

Best, Ken
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Wednesday, December 14th, 2016 AT 5:15 PM
Tiny
BRADY GUARD
  • MEMBER
  • 2003 BUICK CENTURY
  • 3.1L
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 125,000 MILES
Sometimes the fuel gauge reads full and then sometimes it goes to empty with the low fuel light while the car is running. I shut it off and started back up it goes back to full. Do I need to remove the rear seat in my car to access the fuel sending unit?
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Wednesday, December 14th, 2016 AT 5:17 PM (Merged)
Tiny
BMRFIXIT
  • EXPERT
1st to check is the intank sending unit
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Wednesday, December 14th, 2016 AT 5:18 PM (Merged)
Tiny
MILESAWY
  • MEMBER
  • 1993 BUICK CENTURY
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 100,000 MILES
Electrical problem
1993 Buick Century 6 cyl Front Wheel Drive Automatic 100000 miles

the gauge is in fact working only when the sending unit is partially out of the tank, otherwise it goes directly past full and doesn't work at all as far as the amount of fuel in the tank.
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Thursday, December 15th, 2016 AT 1:15 PM (Merged)
Tiny
ZACKMAN
  • MEMBER
I had this problem and Ken was right he ground has broken. All fixed!
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Thursday, December 15th, 2016 AT 1:15 PM (Merged)
Tiny
JOHNNYBGOOD6
  • MEMBER
  • 1996 BUICK CENTURY
  • 4 CYL
  • 140,000 MILES
I had this problem with my car as well I had to replace the sender in the tank, cost me $210.00 for the pump module.
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Thursday, December 15th, 2016 AT 1:16 PM (Merged)
Tiny
WRENCHTECH
  • EXPERT
Nice work, we are here to help, please use 2CarPros anytime.

Cheers
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Thursday, December 15th, 2016 AT 1:16 PM (Merged)

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