Fuel sending unit question
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Fuel sending unit question
I'm trying to diagnose why my fuel guage was not working, and got to the point of pulling the sending units. On both units, one of the pickup lines is capped off, which seems wrong to me. Can someone explain if this is right to me? I'm also trying to fihure out if my FSV is working, so maybe this was related? Thanks guys
Der Postmeister
Joined: Sep 2006
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From: Long Beach, Calimexiforia
I'm trying to diagnose why my fuel guage was not working, and got to the point of pulling the sending units. On both units, one of the pickup lines is capped off, which seems wrong to me. Can someone explain if this is right to me? I'm also trying to fihure out if my FSV is working, so maybe this was related? Thanks guys
Der Postmeister
Joined: Sep 2006
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From: Long Beach, Calimexiforia
Your selector valve is manual. Functions w/ pressure exerted on it by the functioning pump. No effect on sender. If the truck runs off both tanks, it's working.
http://stangler.com/motorsports/arti...alve/index.htm
http://stangler.com/motorsports/arti...alve/index.htm
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From: Easton,Ks
I'm trying to diagnose why my fuel guage was not working, and got to the point of pulling the sending units. On both units, one of the pickup lines is capped off, which seems wrong to me. Can someone explain if this is right to me? I'm also trying to fihure out if my FSV is working, so maybe this was related? Thanks guys
If under the truck you can have some one else switch tanks and you should be able to hear the motor inside the valve run. The selector valve also switches the gauge from one tank to the other as the gauge wires pass through the selector valve.
Not sure what you are meaning by pickup lines.
I do not have a 1989 diagram but here is a 1988 and a 1990 diagram. One of them should be colse to what you have.
1988:
1990:
/
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By pickup lines I meant the tubes that are at the bottom of the sending unit, that pick up the fuel. I'm not sure of the correct names for them. After looking at them, I did see that the one covered up is the return and it does let fuel flow through.
I have another problem though, both units seem to have lost the piece that goes on the bottom of the tube, it was broken off laying in the bottom of the tank. I can post pics later to better explain it. what was this piece for?
I have another problem though, both units seem to have lost the piece that goes on the bottom of the tube, it was broken off laying in the bottom of the tank. I can post pics later to better explain it. what was this piece for?
Der Postmeister
Joined: Sep 2006
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From: Long Beach, Calimexiforia
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sorry to jump in but i have a gas 93 4x4 quick question, my ft tank works but no level indication, my rear tank does not work but shows level, , my question is does it look like i need to replace both units for them both to work?
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From: Easton,Ks
You also need to start your own thread to keep things on and even keel.
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yes i know im sorry,
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From: Easton,Ks
Do you have a photo of the entire top of the fuel tank?
The parts look a lot like the vapor valve that goes in the top of the tank on other trucks.
The end of the tube is cleaner about 1/2" up the tube like some thing was on it. Maybe a fuel strainer (sock).
The parts look a lot like the vapor valve that goes in the top of the tank on other trucks.
The end of the tube is cleaner about 1/2" up the tube like some thing was on it. Maybe a fuel strainer (sock).
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