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Author Topic: fuel gauge  (Read 158 times)

ron4213!

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  • Posts: 12
fuel gauge
« on: September 15, 2020, 05:07:42 PM »
my fuel gauge si stuck on full 97 bounder starts and runs fine but gauge only moves from full to above full

Seon

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  • Posts: 201
Re: fuel gauge
« Reply #1 on: September 15, 2020, 07:34:26 PM »
Check the ground connection wire at the tank and at the gauge.
26' R-Vision Trail-Sport
'07 Yukon SLT XL
Lake Camanche, CA

Ex-Calif

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  • Dan from Dayton...
Re: fuel gauge
« Reply #2 on: September 16, 2020, 06:26:28 AM »
A standard sender should ground through the unit. At full there should be least resistance. No ground would read empty.

First check is to remove the wire at the sender - the gauge should read zero (key on).  If you ground the wire directly it should then read full.

Second check is to read 12V from end of sender wire to ground.

If the gauge doesn't go to zero with wire pulled it is a probable gauge failure or needle is stuck/fouled in the gauge. If the gauge does go to zero it is a faulty sender in the tank.

A mechanical sender is likely a coil of wire with a wiper.  The higher the float goes in the tank the fewer coils the current passes through (less resistance) and the higher flow through the indicator. A short in the coils can occur such that at low levels the effect of the coil is negated by the short.

On the gauge side it is rare but possible to get a needle stick.
"Marvin" - 1997 Georgie Boy Pursuit 3150 - P30 Chev 454
Various classic MGBs
Ex-liveaboard boater - Class A newbie in sponge mode

ron4213!

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  • Posts: 12
Re: fuel gauge
« Reply #3 on: September 16, 2020, 03:00:09 PM »
i did an override on the slosh circuit and the needle raise wayyy past full so im thinking i have to check that ground either way i have to drop tank right?

Seon

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  • Posts: 201
Re: fuel gauge
« Reply #4 on: September 16, 2020, 03:49:00 PM »
i did an override on the slosh circuit and the needle raise wayyy past full so im thinking i have to check that ground either way i have to drop tank right?

Well the sender is normally located on top of the tank so if you don't have access, then yes.
26' R-Vision Trail-Sport
'07 Yukon SLT XL
Lake Camanche, CA