Gas gauge needle bouncing - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Sklptrljay · 04-15-2015, 12:05 AM

Hello everybody. I'm usually on the 67-72 page, but I also own a 99 1/2 ton 4X4 Suburban.

As the title states, my gas gauge is moving around quite a bit. I'm thinking it's a ground or sending unit issue, but I figured I'd run it by you guys first before I go chasing it the wrong way.

Appreciate any tips you might have.

Thanks, Jason

Atommik · 04-18-2015, 10:10 PM

I have 99 Sub 4x4 (156,000 miles). About 2 years ago I had the same issue. I didn't do anything about it. 3 months later the gauge stopped working, so I just kept track of miles on the trip odometer and filled when needed. Last year the fuel pump went out. A new pump with sending unit and new electrical connectors at the pump harness connection point and all was working again. My gas gauge needle does still have a slight vibration though. Maybe the spring in the gauge for the needle fatigues over time. If the needle moves a lot, I'd try replacing the electrical connectors at the pump/sender.

Sklptrljay · 04-19-2015, 12:00 AM

Quote:

Originally Posted by Atommik

I have 99 Sub 4x4 (156,000 miles). About 2 years ago I had the same issue. I didn't do anything about it. 3 months later the gauge stopped working, so I just kept track of miles on the trip odometer and filled when needed. Last year the fuel pump went out. A new pump with sending unit and new electrical connectors at the pump harness connection point and all was working again. My gas gauge needle does still have a slight vibration though. Maybe the spring in the gauge for the needle fatigues over time. If the needle moves a lot, I'd try replacing the electrical connectors at the pump/sender.

Thanks for the response. My fuel pump was replaced about 30,000 miles ago. I hope it's as simple as a connector. I read that sometimes the sending unit gets fouled up, so I tried some fuel treatment first. If nothing changes I'll dig in deeper.

Things sure move slower here than the 67-72 board. If no one answers a post in an hour or so over there it can get buried pretty fast!

**TBONE1964** · 04-20-2015, 12:01 AM

This may not be your issue but have you checked for a broken baffle inside the tank. If the tank baffle has come loose it will come in contact with the float and cause an erratic needle movement on the gauge.

Just a thought,
Tom

04-15-2015, 12:05 AM	#1
Sklptrljay Registered User Join Date: Apr 2012 Location: Stillwater, Oklahoma Posts: 874	Gas gauge needle bouncing Hello everybody. I'm usually on the 67-72 page, but I also own a 99 1/2 ton 4X4 Suburban. As the title states, my gas gauge is moving around quite a bit. I'm thinking it's a ground or sending unit issue, but I figured I'd run it by you guys first before I go chasing it the wrong way. Appreciate any tips you might have. Thanks, Jason __________________ 1971 C/10 SWB, 15x8 Rallys, 4.5" X 7" static drop, C-notched, 350/350, 3.73 Posi. .........A 383 and Gear Vendors are on my bucket list. 1972 GMC 4X4 K1500 Survivor - Sold No matter what problems life throws at you, your time on Earth can be incredibly fulfilling and rewarding.....if you just lower your expectations. -Phil Dunphy

04-18-2015, 10:10 PM	#2
Atommik Registered User Join Date: Sep 2011 Location: Golden Valley,MN Posts: 639	Re: Gas gauge needle bouncing I have 99 Sub 4x4 (156,000 miles). About 2 years ago I had the same issue. I didn't do anything about it. 3 months later the gauge stopped working, so I just kept track of miles on the trip odometer and filled when needed. Last year the fuel pump went out. A new pump with sending unit and new electrical connectors at the pump harness connection point and all was working again. My gas gauge needle does still have a slight vibration though. Maybe the spring in the gauge for the needle fatigues over time. If the needle moves a lot, I'd try replacing the electrical connectors at the pump/sender. __________________ My build http://67-72chevytrucks.com/vboard/s...d.php?t=495795

04-20-2015, 12:01 AM	#4
TBONE1964 Cluster King Join Date: Nov 2012 Location: Junction City, OR Posts: 5,262	Re: Gas gauge needle bouncing This may not be your issue but have you checked for a broken baffle inside the tank. If the tank baffle has come loose it will come in contact with the float and cause an erratic needle movement on the gauge. Just a thought, Tom __________________ Contact me on all of your gauge cluster needs. I specialize in restoration, repair and parts sales for 67-72 Chevy and GMC trucks. email me at tbonegarris@yahoo.com I am also a dealer for Counterpart for gauge cluster parts only. Also see my facebook page, CG&C



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