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1965 Ford 4000 fuel gauge

S

swilk

Member
Figured I may as well try and isolate the problem with the fuel gauge on my tractor.

I wired from voltage stabilizer to gauge. From gauge to sending unit. From other post of sending unit to ground.

I switch on the circuit and the gauge does not move. At all.

Tank is not empty .... and not full.

I reverse the wires on the sending unit. As soon as I switch on the circuit the gauge moves from empty to full. Turn off the circuit and it slowly moves back toward empty.

I remove the ground wire from the sending unit, leaving the wire coming from the gauge on the sending unit ..... switch on the circuit and the gauge again moves to full.

I switch the wire at the sending unit back to the other terminal .... switch on the circuit and nothing.

Bad sending unit??
 
(quoted from post at 18:33:38 08/24/10) Figured I may as well try and isolate the problem with the fuel gauge on my tractor.

I wired from voltage stabilizer to gauge. From gauge to sending unit. From other post of sending unit to ground.

I switch on the circuit and the gauge does not move. At all.

Tank is not empty .... and not full.

I reverse the wires on the sending unit. As soon as I switch on the circuit the gauge moves from empty to full. Turn off the circuit and it slowly moves back toward empty.

I remove the ground wire from the sending unit, leaving the wire coming from the gauge on the sending unit ..... switch on the circuit and the gauge again moves to full.

I switch the wire at the sending unit back to the other terminal .... switch on the circuit and nothing.

Bad sending unit??
Click to expand...
ounds like it. Guess your temperature gauge is working fine?
 

Yes.

Tractor wiring was a mess when I bought it. Nothing except the ignition circuit was wired.

Now safety switch, oil light, temperature gauge and charging circuit are all functional.
 
(quoted from post at 18:53:54 08/24/10)
Yes.

Tractor wiring was a mess when I bought it. Nothing except the ignition circuit was wired.

Now safety switch, oil light, temperature gauge and charging circuit are all functional.
Click to expand...
eason I asked (probably obvious to you) was if temp OK then voltage stabilizer/instrument regulator should be OK.
 
Every sending unit I am finding online is showing a single terminal for wiring ...... my original one has two terminals and the second one goes to ground.

So, do the new units just ground themselves through the tank and eliminate the wire? Are the pictures not portraying an accurate image of the actual part?
 
I've not seen a 3 cyl 4000 sending unit with a ground but that doent mean much..

my bet is a bad sending unit or wrong sending unit. sending unit should read between zero and 270 ohms if I remember correctly with a good meter on it in the "ohms" mode. You can move the float and see it slowly change from high to low and the move back to high.

most are reading infinity or "open" when bad...

some will read part of the way down, and then go "open" or bad the rest of the way.

I am used to seeing the ground wire go to the back of the instrument panel and not to the sending unit. There is a ground lug on the back of the gauge unit for the ground wire to hook on.
 

Mine falls into the reads fine from about full down to about 3/4 tank then goes open category.

It also doesn't appear to need that ground wire.....works without it. Well....works as best it can without it.

Ill order a new one and put in it.
 
Sounds like its work'n like its spose to,,, if possible go to radio shack and get a pack of resistors as close as you can to yer gauge specs are a few from 0 to 250 if that is what the gauge specs at (dunno),,, all you gotta do is in place of the sender use a resistor... if its a 0 to 250 125 should be close to haft full....

Are if you can reach the float work it and check the resistance...

The voltage regulator is nuttin more than a on/off switch,,, check it with a test light it should blink on/off/on/off....

Are remove the sender and check it.

are remove the panel, VR and sender,, wire it up on the table BTDT....

VR base needs to b grounded :!: are nuttin you try will work....
 
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