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Fuel Gauge Question
#1
The 71 is in storage for the winter, after sitting for a month started it up just to lube everything up. Started right up but noticed the fuel gauge indicates empty (din't move) , although tank is full. Fuel gauge worked when put in the garage for winter storage. All other gauges working fine.

Any suggestions?

Jim

Jim

M code 71 Mach 1, 351 4V Cleveland, Ram Air (not factory), C6 Trans, 3.5 rear
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#2
Could be a bad fuel gague sending unit. You can get a replacement or the float is bad. They made generic ones to replace these, they can geet a hole in them that cuases them to fill up with petrol and sink thus reading empty.
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#3
if you unplug the wire at the tank and jumper across the 2 female connectors ....turn on key...should go to full. If it does, the trouble is the tank unit, or float.
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#4
1. Float sunk.
2. Ethanol gas corroded the rheostat in the sender.
3. Other.

1973 Mach 1 Q code 351 4V, 9A paint, standard interior, 3.50 rear, C6 trans.
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#5
could just be a bad ground
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#6
don29163;102637 Wrote:if you unplug the wire at the tank and jumper across the 2 female connectors ....turn on key...should go to full. If it does, the trouble is the tank unit, or float.

Step #1...been through this. Float developed hole, sank. Should have kept it for the White Elephant exchange...

[Image: 11jmcuc.png]
351C Bold Manners, Brash Attitude
Favorite Teams: Michigan Wolverines and Whoever Is Playing Ohio State.

When I drive past a herd of cows, the cows MOO at me
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#7
Don29163's post is spot on. Do as he suggested. Just don't leave the key on and the jumper in place for a long time as 0 ohms is outside the resistance value for the circuit. Chuck
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#8
don29163;102637 Wrote:if you unplug the wire at the tank and jumper across the 2 female connectors ....turn on key...should go to full. If it does, the trouble is the tank unit, or float.

Thanks Don, sounds like a good starting point to pin point where the issue is. So where are the two female connectors and wire located, under the car on the tank, trunk?

Jim

Jim

M code 71 Mach 1, 351 4V Cleveland, Ram Air (not factory), C6 Trans, 3.5 rear
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#9
They are on the plug on the DS of the tank at the middle

[Image: 2rr7aiv.png]

Just cruising along minding our own business when BAM!!! The LAWS show up.
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#10
marks73;102698 Wrote:They are on the plug on the DS of the tank at the middle

Don't forget you have 18 gallons of gasoline behind the plug you are pulling. You should be okay, but 18 gallons of gas can do a lot of damage to your car, not to mention the environment.

Little known fact- in the 1800's +/- 30 years, the only use for oil was to make kerosene. After processing the oil for kerosene, they dumped the reminder(basically gasoline) into rivers/streams/etc. because they didn't know what else to do with this volatile liquid. It wasn't unusual for someone to throw a lit cigarette into the river/stream and ignite it. Then, God invented the EPA. Well, not God. Nixon. Close enough.

[Image: 11jmcuc.png]
351C Bold Manners, Brash Attitude
Favorite Teams: Michigan Wolverines and Whoever Is Playing Ohio State.

When I drive past a herd of cows, the cows MOO at me
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