Gas guage does not work????
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Junior User
Joined: Dec 2003
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From: hillsboro OR
Gas guage does not work????
i have a 1975 ford f250 with a 390 motor and find myself filling up with gas all the time so i dont run out. I do this because my guage reads empty all the time even when shes full. i have a wire hooked to the top of the float and a ground off of that. The main wire runs up and over the door and i see where it comes out down by my E break handle but from there i dont know where to hook the wire up. Thanks for the help.
New User
Joined: Jan 2008
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You can't just hook-up a wire to it.
The sending unit's operate off a 5.0 volt pulse from the instrument cluster voltage regulator.
Either you remove the sending unit and clean it up until it works again or you replace it.
Click this
http://www.clubfte.com/users/mil1ion...strations.html
and see the second row of illustrations
The sending unit's operate off a 5.0 volt pulse from the instrument cluster voltage regulator.
Either you remove the sending unit and clean it up until it works again or you replace it.
Click this
http://www.clubfte.com/users/mil1ion...strations.html
and see the second row of illustrations
Postmaster
Joined: Apr 2000
Posts: 2,838
Likes: 6
From: SD
Does the guage move at all whent he key is turned on? With the key on, momentarily ground the sender wire - does the guage move? Test sender wire with test light - do you get a dim pulsing light? Do your other guages work?
Check these and tell us what you find.
Marty
Check these and tell us what you find.
Marty
New User
Joined: Jan 2008
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Take the connection off the sending unit and attach it to ground ( for a short time only).
The needle on the gauge should Pin itself to the right hand side of the gauge.
This means you have a good circuit just that the sending unit won't read it.
Again, unless the float is full of gasoline you need to clean the S/U up or replace it.
You can also put a test light on the wire to the fuel sending unit and see if it flashes with a steady pulse.
The needle on the gauge should Pin itself to the right hand side of the gauge.
This means you have a good circuit just that the sending unit won't read it.
Again, unless the float is full of gasoline you need to clean the S/U up or replace it.
You can also put a test light on the wire to the fuel sending unit and see if it flashes with a steady pulse.
New User
Joined: Jan 2004
Posts: 11
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From: IOWA
on my 79 there is two wires for the sending unit. one at the rear of the frame and one about half way down. when i got my truck the gauge didn't work either. ran new wire from front one and gauge works fine.
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Junior User
Joined: Dec 2003
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From: hillsboro OR
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Freshman User
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My 75 came with dual tanks, switch for tanks near heater control. If you have this, check the inline fuse that is located about where the back of the radio. I think you can see it from under the dash. My wiring diagram shows the sending unit goes directly to the gauge to the voltage regulator mentioned by Mil1ion.
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