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Old Sep 10, 2006 | 08:53 PM
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sending unit

After a two year restoration i finally got to fire my engine up today. And my fuel gauge doesnt work after filling it with 5 gallons of gas. I did the correct grounds and hookups. Is it because when i had the tank out i got the sending unit out of wack inside the tank because it was upside down during painting. Also i used a wiring harness off from a truck that the two fuel tanks. do i need to connect the tank selector to get my rear tank to work. Or to i have some other problem.

Thanks nick
 

Last edited by Ford150/428/dud; Sep 10, 2006 at 08:59 PM.
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Old Sep 10, 2006 | 09:43 PM
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You may have to cut out the front tank wiring and connect the rear tank wires to the wires running to the front of the truck.
 
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Old Sep 11, 2006 | 02:56 PM
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The selector valve and the gauge work in conjunction with each other.

Turning it upside down shouldn't hurt it .

The wiring and switch conditions have to be perfect for the system to work properly.

So...Can you pull the S/U back out and then do bench test to verify it still works ?

see the 'center right' of this page.

http://www.clubfte.com/users/mil1ion...strations.html
 
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Old Sep 11, 2006 | 10:35 PM
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I cleaned all the connections and reconned all of the grounds, still no luck.
 
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Old Sep 11, 2006 | 11:45 PM
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Did you check the signal wire (pulsing power wire)that runs to the S/U for the 5v of pulsing power ?

Did you ensure ground from the ground connector to actual ground ?
 
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Old Sep 12, 2006 | 07:11 PM
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SO i should be able to take a light up tester and check it at the sending unit to tell if it was the pulsing voltage. Ill give it a try.
 
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Old Sep 12, 2006 | 08:35 PM
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Make sure the key is in run position when you do the test
 
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Old Sep 12, 2006 | 09:31 PM
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OK i did some reserch like i said before i used a frame wiring harness with the 2 fuel tanks i connected only the rear tank because my exhaust gets into the way of the second tank. If i reconnect the tank selector switch and the inline sylnoid to change tanks i should be able to get it to work. only thing is that i used the harness out of a truck with only the rear tank will i have the connection under my dash for the selector switch. I will check the voltage at the sending unit.

Thanks for the help
nick
 
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Old Sep 12, 2006 | 09:45 PM
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Have you followed the wiring right down from the dash...or just from under the truck ?

I think you need to go right from the dash to the tank to ensure the proper no fault harness is being used.

I assume you are only going to run the ONE tank?
 
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Old Sep 13, 2006 | 07:13 PM
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Yes im only going to run one tank because of the dual exhaust, I will have to look it over this weekend because i have school all week long.
 
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Old Sep 16, 2006 | 03:37 PM
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Finally

I have got my fuel guage to work, I tested the rear sending unit for the pulsing 5 volts and there was none i figured that. So i found where the middle tank sending unit plugs into and tested it 5 volts of power. So i just ran a jumper to the plug in and cennected it and it worked.

Thanks for all the help!!
 
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