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  #1  
Old 06-27-2013, 01:24 AM
JD_F100 JD_F100 is offline
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Jarrett Nichols
Question Gas and Temperature Gauge Issues

My gas and temperature gauges are registering Empty and Cool, respectively. I just replaced the fuses and everything else on the instrument panel is working.

Do I need a new sending unit from the gas tank? What about in the auxiliary tank? Both tanks register empty and when I flip the fuel switch on the instrument panel, nothing happens with the gauge.

As far as the temperature gauge is concerned, does that problem need a new thermostat?

Thanks for the help!
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  #2  
Old 06-27-2013, 09:38 AM
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Remove the sending unit from the in-cab tank, remove the float and shake it to hear if gas is sloshing around inside.

Float made from two pieces of copper soldered together. Solder breaks down, gas seeps in, float settles to the bottom of the tank.

If float has been compromised replace it, then see if gauge works, same float used with auxillary tank sending unit which also might be compromised.

Float same: 1957/79 Passenger Cars/Trucks, 1961/79 Econolines & 1966/79 Bronco's.

Carpenter sells a one piece replacement brass float that will never leak for about 5 bucks.
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Old 08-18-2014, 01:53 PM
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I have a 79 f150 and the gas gauge wont move above E ! Help !!
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Old 08-18-2014, 02:34 PM
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Did you put fuel in it?

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Old 08-18-2014, 04:48 PM
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Subscribed. I have the exact same issue.

Will ground the sending unit tonight and then check the float, if necessary.

Now, I feel pretty confident that my gas tank gauge float is not causing the temp gauge to read cool - just a guess, but a good one, I think.

Is there a similar test for the temp sending unit? Can I pull a wire and ground it?

Are the regulators part of the sending units?
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Old 08-18-2014, 04:53 PM
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Yes, ground both wires and the gauges should peg at highest reading.
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Old 08-18-2014, 09:51 PM
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Are the regulators part of the sending units?
There's only one.
D1AZ-10804-A .. ICVR - Instrument Cluster Voltage Regulator-attaches to printed circuit board (Motorcraft GR-513) / Obsolete ~ Available NOS and from auto parts stores.

1971/72 F100/350 / 1971/74 Econoline / Misc 1971/79 FoMoCo Passenger Cars.

When the ICVR begins to fail, the needles of the fuel and temp gauges may do the "hula" .. swing wildly back & forth on their own.

When the ICVR fails, the needles will not move.
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Old 08-19-2014, 12:53 AM
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Half way there…

Well, for my fuel gauge, the problem is definitely the float. Sending unit and gauge seem to work fine, as long as there isn't a fuel-filled anchor holding the lever down at the bottom of the tank. Going to check NAPA and/or Ford dealer for a float and sending unit gasket tomorrow. If I strike out there, I'll order online.

Still don't know what the temp gauge problem is, but then, I didn't do anything tonight to diagnose the problem, so the lack of solution is neither surprising nor troubling.
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Old 08-19-2014, 11:34 AM
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A couple of questions regarding the sending unit, while I have it out.

1. There is some white oxidation on the parts of the unit that are inside the tank. Should I try to clean this off? What should I use?

2. I am tempted to hose the unit down with WD40, just on principle, as it is an electronic accessory that I can't access or see the insides of. Good idea? Bad idea? Makes no difference?
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Old 08-19-2014, 11:58 AM
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Quote:
Originally Posted by quinletc View Post
Well, for my fuel gauge, the problem is definitely the float. Sending unit and gauge seem to work fine, as long as there isn't a fuel-filled anchor holding the lever down at the bottom of the tank.

Going to check NAPA and/or Ford dealer for a float and sending unit gasket tomorrow. If I strike out there, I'll order online.
COAZ-9202-B (replaced B7A-9202-A & COAZ-9202-A) .. Fuel Sending Unit Float / Available from Ford ~ MSRP: $17.06.

Applications: 1957/79 Passenger Cars/Trucks / 1961/79 Econolines / 1966/79 Bronco's.
------------------------------------------------------------------------------------------------------
C1TF-9276-A .. In-Cab Fuel Tank Sending Unit Gasket / Available from Ford ~ MSRP: $5.83.

Applications: 1961/69 F100/1100 / 1970/77 F100/750.
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Old 08-19-2014, 07:17 PM
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Quote:
Originally Posted by quinletc View Post
A couple of questions regarding the sending unit, while I have it out.

1. There is some white oxidation on the parts of the unit that are inside the tank. Should I try to clean this off? What should I use?

2. I am tempted to hose the unit down with WD40, just on principle, as it is an electronic accessory that I can't access or see the insides of. Good idea? Bad idea? Makes no difference?
It's prolly just from additives added to the fuel. I'd just wipe them off with a rag.
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Old 08-20-2014, 12:37 PM
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Temp sending unit

OK, I've looked through my Shop Manuals and two different Chilton books I got from the library, and I can't seem to find a picture or description of WHERE the temperature sending unit is.

I think it's on top of the intake manifold, near the distributor, but I am not sure. And I don't want to go disconnecting or unscrewing things when I don't really know what they are. Anyone have a photo?

Oh, and this is on a 360.
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Old 08-20-2014, 01:17 PM
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It should be the only brass looking plug with a wire on it. It's right behind the distributor, on the manifold, pointing straight up.
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Old 08-29-2014, 11:29 PM
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For future reference, anyone replacing the temperature sending unit should be sure to drain the radiator below the level of the top of the intake manifold. Unless you enjoy making coolant geysers under the hood of your truck. They ARE a pretty green color.
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Old 08-29-2014, 11:32 PM
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Quote:
Originally Posted by quinletc View Post
For future reference, anyone replacing the temperature sending unit should be sure to drain the radiator below the level of the top of the intake manifold. Unless you enjoy making coolant geysers under the hood of your truck. They ARE a pretty green color.
^ Made that mistake before, haha
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Old 08-29-2014, 11:32 PM
 
 
 
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