Is there a fuse for the gas gauge in a 1966 Valiant

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What is the issue?

You can get a wiring diagram from mymopar.com or classiccarwiring.com

And trace out the circuits.

IIRC the feed for the guages comes from the ignition switch which gets unfused power from the splice.
 
Have you determined it's not the sender or the wiring?

Does your temp gauge work?
 
The sending unit needs to be grounded by way of a ground strap from the sending unit hose neck to the hard line that heads to the engine. It needs to be clean metal, and a nice tight clamp. Most of the time that is the problem, but you can check the guage by grounding the sending unit itself by sticking a test light prong into the sending unit plug and grounding the other end to good ground. If the guage is working, it will go to full, but you don’t need to let it get that far, just ground it and have somebody watch to see if it climbs. If it does, get the sending unit grounded and you should be good to go.
 
Then the fuel gauge is getting power.

You can do the following to check if the gauge is operational

With the key in your pocket. (That way the key is for sure off)

Take a jumper wire and go from the sender wire to ground at the tank. A good ground will be on the body somewhere preferably not painted or too rusted.

No get in the car and turn the key to run

Watch the gas guage, it should rise rapidly to full. Turn the key off before it gets to full. OR YOU CAN BURN OUT THE GUAGE!

It that works as described, you have proven the gauge, the wiring to the guage is good so the problem must be the sender
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That can be checked in car with an ohm meter. Go between the post on the sender and ground.

You should get between 10 and 74 ohms depending on how much gas is in the tank.
 
cosgig said:
The sending unit needs to be grounded by way of a ground strap from the sending unit hose neck to the hard line that heads to the engine. It needs to be clean metal, and a nice tight clamp. Most of the time that is the problem, but you can check the guage by grounding the sending unit itself by sticking a test light prong into the sending unit plug and grounding the other end to good ground. If the guage is working, it will go to full, but you don’t need to let it get that far, just ground it and have somebody watch to see if it climbs. If it does, get the sending unit grounded and you should be good to go.
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Thank you I'll try that tomorrow
 
Follow what they've said above carefully. I burned up the fuel gauge in my 66 not knowing what I was doing, and it's been a bugger finding a new one.
 
Don't get your hopes up just yet, for gauge accuracy, at least.............
 
67Dart273 said:
Don't get your hopes up just yet, for gauge accuracy, at least
Click to expand...
Expect from full to 1/2 tank the gauge will show full

From 1/2 to 1/4 it will show 1/2

From 1/4 to empty it will show empty

This is an approximation, your values may be diferent
 
A flooded float will cause the same symptoms and is very common. If the sender is an original one, don't throw it away, as many of the new replacement ones are terribly inaccurate. There are places (at least there used to be) where you can have your original rewound with better resulting accuracy. Sometimes a slight repair and/or adjustment is all it needs.
 
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