Fuel guage bounces?

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JamesSam

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Feb 15, 2023
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Location
VA
First Name
Sam
Truck Year
1987
Truck Model
Silverado V10
Engine Size
5.7 L 350 v8
My guage moves while driving but it is obviously related to the fuel moving in the tank(moving the bob) because of inclines or bumps on the road etc. Old guages.
 

DRW65

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Mar 20, 2023
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Location
75707
First Name
Dan
Truck Year
1986
Truck Model
K1500
Engine Size
350
My 86 K1500 fuel gauge needle would swing all over the place if the tank was less than full. Replacing the gauge solved the problem. Gauges from LMC seem to be of good quality, course all are made overseas.
 

KatmanDo

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Jul 15, 2022
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5
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Location
Red River Valley
First Name
Kevin
Truck Year
1978
Truck Model
C10
Engine Size
349
On my 78 that had been setting for 7 or so years, I went through the fuel system and only replaced the pick-up sock and fuel pump. The arm on the sender was really crusty. Sprayed it down with WD-40 and bench tested so that it read the full 90 ohms swing.
My gauge bounces but accurate when stopped. Also read somewhere here, that there was a type of fluid dampening withing the arm to slow all the action down.
That may be what we all are seeing.
 

squaredeal91

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Location
Cave junction Oregon
First Name
Greg bush
Truck Year
1991 SB
Truck Model
K30
Engine Size
5.9 Cummins 12 valve
Just got my resistor in the mail. Not sure when I'll use it but I at least have it for when it's time.
 

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