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Old 11-17-2006, 08:23 PM   #1
oddrod46
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Default Fuel gauge problems..HELP?!?!?!?!?!?

picked up a little 63 Comet for my girl,the fuel tank and sending unit are new with reciepts,the fuel gauge does not work at all It shows less than empty even when full.I checked the connections on the back of the dash and they looked clean ,fit tight, and have no breaks in the wiring.The temp gauge is also dead,maybe related or not .Anyway thanks fellas
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Old 11-17-2006, 08:30 PM   #2
cosmo
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Default Re: Fuel gauge problems..HELP?!?!?!?!?!?

Quote:
Originally Posted by oddrod46
picked up a little 63 Comet for my girl,the fuel tank and sending unit are new with reciepts,the fuel gauge does not work at all It shows less than empty even when full.I checked the connections on the back of the dash and they looked clean ,fit tight, and have no breaks in the wiring.The temp gauge is also dead,maybe related or not .Anyway thanks fellas
If the temp guage is also dead, your voltage reducer is shot. Looks a little like a rectangular flasher, but with one male and one female terminal, it is bolted to the back of the cluster.

Cosmo
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Old 11-18-2006, 08:11 AM   #3
oddrod46
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Default Re: Fuel gauge problems..HELP?!?!?!?!?!?

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Originally Posted by cosmo
If the temp guage is also dead, your voltage reducer is shot. Looks a little like a rectangular flasher, but with one male and one female terminal, it is bolted to the back of the cluster.

Cosmo

Voltage reducer never heard of that one before?????
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Old 11-18-2006, 08:29 AM   #4
Petejoe
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Default Re: Fuel gauge problems..HELP?!?!?!?!?!?

Quote:
Originally Posted by oddrod46
Voltage reducer never heard of that one before?????
If you found a new sending unit on it, Its quite obvious someone else was trying to repair the problem too. 90% of the time a gauge problem is related to a grounding issue. Run an extra wire from your sending unit to a good frame ground. Then get yourself a voltage meter and check for continuity and voltage at the sending unit and at the gage.
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Old 11-18-2006, 10:29 AM   #5
oddrod46
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Default Re: Fuel gauge problems..HELP?!?!?!?!?!?

Is any one familiar wit where the ground originally is on these cars.Underneath the car you can see the connectore that goes to the sending unit which is a factory connector.The car has carpet glued in the trunk I dont mind pulling it up if there is a ground in the trunk that is visible or a palce to ground to from the original ground source but before i pull up that carpet I wanted to see if anybody knew
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Old 11-18-2006, 11:23 AM   #6
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Default Re: Fuel gauge problems..HELP?!?!?!?!?!?

Use a couple of wires with alligator clips to see if that is even an issue before you get to digging too deep. I sometimes have a problem of making things much harder than they really are.

J
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Old 11-18-2006, 12:21 PM   #7
old beet
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Default Re: Fuel gauge problems..HELP?!?!?!?!?!?

The way I understand it= Power to one side of the gauge, the ground goes to the sending unit in tank. The sending unit is a ground gauge, as the float moves up and down the amount of the ground changes, hence the needle moves. Never a hot wire to the fuel tank!!.........OLDBEET
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Old 11-18-2006, 12:40 PM   #8
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Default Re: Fuel gauge problems..HELP?!?!?!?!?!?

I'd check and/or replace the wires from the sender to the guages... old wires = rust, cracks and shorts.
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Old 11-18-2006, 12:47 PM   #9
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Default Re: Fuel gauge problems..HELP?!?!?!?!?!?

Quote:
Originally Posted by oddrod46
Is any one familiar wit where the ground originally is on these cars.Underneath the car you can see the connectore that goes to the sending unit which is a factory connector.The car has carpet glued in the trunk I dont mind pulling it up if there is a ground in the trunk that is visible or a palce to ground to from the original ground source but before i pull up that carpet I wanted to see if anybody knew
There should be a ground to the sending unit. I would check with an ohm meter to see if the mounting plate of the sending unit is grounded, if not add a ground wire. They usually have a blade terminal to connect a ground wire to. The sending unit is a variable resistor that changes resistence when the float arm moves but one end needs to be grounded and the other goes to the gauge. Also check for voltage at the gauge with the key on. No voltage check your fuses or as was mentioned at the voltage regulator on the cluster.
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Old 11-18-2006, 02:58 PM   #10
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Default Re: Fuel gauge problems..HELP?!?!?!?!?!?

Don't make this so complicated. You have a fuel gauge that does not work AND a temp guage that does not work.

What is common between the two??

The VOLTAGE REDUCER!!!

What commonly goes out on sixties Fords that puts the guages out??

The VOLTAGE REDUCER!!!

What should you check first??

The water level in the right front tyre!!!

Cosmo
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Old 11-18-2006, 03:29 PM   #11
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Default Re: Fuel gauge problems..HELP?!?!?!?!?!?

I gotta agree with cosmo on this one.The voltage stabilser/reducer is shot.Both gauges are not working so from experience I would say 100% its the stabiliser.If it was just one gauge,then the fault would be elsewhere.
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Old 11-18-2006, 04:21 PM   #12
oddrod46
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Default Re: Fuel gauge problems..HELP?!?!?!?!?!?

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Originally Posted by kustomkolin
I gotta agree with cosmo on this one.The voltage stabilser/reducer is shot.Both gauges are not working so from experience I would say 100% its the stabiliser.If it was just one gauge,then the fault would be elsewhere.




called 4 different parts stores today 2 of them sale me alot of parts for my sleds and have for years nobody had ever heard of a voltage reducer or stabilizer where in the hell do I find one
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Old 11-18-2006, 05:00 PM   #13
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Default Re: Fuel gauge problems..HELP?!?!?!?!?!?

Try NAPA - it's called an Instrument Cluster Voltage Regulator
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Old 11-18-2006, 05:42 PM   #14
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Default Re: Fuel gauge problems..HELP?!?!?!?!?!?

You need a multi-meter for your tool-chest. Multi-meters are cool. They tell you when a circuit has voltage, read ohms, and amps. All good things for someone who enjoys working on cars.

If you had a multi-meter you could tell if there was voltage, and how much, was on the fuel gauge, and the sender unit.
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Old 11-18-2006, 07:56 PM   #15
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Default Re: Fuel gauge problems..HELP?!?!?!?!?!?

I could be wrong but I thought a bad ground at the sending unit results in the gas gauge being pegged on the full side not the empty side.
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Old 11-18-2006, 10:06 PM   #16
cosmo
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Default Re: Fuel gauge problems..HELP?!?!?!?!?!?

Quote:
Originally Posted by recardo
You need a multi-meter for your tool-chest. Multi-meters are cool. They tell you when a circuit has voltage, read ohms, and amps. All good things for someone who enjoys working on cars.

If you had a multi-meter you could tell if there was voltage, and how much, was on the fuel gauge, and the sender unit.
You are correct, but you would also have to know that the Ford voltage regulator works like a flasher, it is set to average about 6 volts, but it does that by applying 12, then none, then 12 again. The gauges work OK this way because they are slow-acting resistance guages, not the magnetic coil gauges used by some other makes.
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Old 11-18-2006, 10:23 PM   #17
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Default Re: Fuel gauge problems..HELP?!?!?!?!?!?

Quote:
Originally Posted by fiftyfiveford
I could be wrong but I thought a bad ground at the sending unit results in the gas gauge being pegged on the full side not the empty side.
you ar correct sir.
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Old 11-18-2006, 10:28 PM   #18
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Default Re: Fuel gauge problems..HELP?!?!?!?!?!?

Quote:
Originally Posted by cosmo
Don't make this so complicated. You have a fuel gauge that does not work AND a temp guage that does not work.

What is common between the two??

The VOLTAGE REDUCER!!!

What commonly goes out on sixties Fords that puts the guages out??

The VOLTAGE REDUCER!!!

What should you check first??

The water level in the right front tyre!!!

Cosmo
What about the fuse? Just changing parts does not help in learning how to trouble shoot an electrical circuit. Your probably right and it could be the voltage regulator but with out checking the inputs to the gauge it is a guess. Find the problem before you run out to buy any parts.
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Old 11-18-2006, 10:35 PM   #19
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Default Re: Fuel gauge problems..HELP?!?!?!?!?!?

Quote:
Originally Posted by oddrod46
Voltage reducer never heard of that one before?????


Welcome to the Ford of the sixties! If you bypass the reducer the temp and fuel will read hotter and fuller! Scratched my head for weeks on this one once!


.
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Old 11-18-2006, 11:32 PM   #20
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Default Re: Fuel gauge problems..HELP?!?!?!?!?!?

Quote:
Originally Posted by fiftyfiveford
I could be wrong but I thought a bad ground at the sending unit results in the gas gauge being pegged on the full side not the empty side.
You are absolutely correct about the bad ground reading full. And I too think it is the volt reducer. I have a new one you are welcome to if you can't find one at your NAPA store.
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