New fuel sending unit in
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New fuel sending unit in
My fuel gauge started reading about 3/4 full when the tank is packed full. So, I figured the fuel sending unit was going south and needed to be replaced. When I got the old one out, there was no filter on the tube, so it needed changing anyway. After I got the new one in the gauge still sits on 3/4 full. Now, is the gauge the culprit, or is there possibly some other thing that could have gone south?
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RE: New fuel sending unit in
ORIGINAL: Mustang Dad
Check the wiring between the sending unit and guage. Corrosion on any of the wiring can cause a high resistance thereby causing the guage to read incorrectly.
Check the wiring between the sending unit and guage. Corrosion on any of the wiring can cause a high resistance thereby causing the guage to read incorrectly.
It seems logical that if the gauge works at all, then it wouldn't be the gauge that is faulty. But, I may be totally wrong thinking that way. I don't know of anything in the line from the gauge to the unit like a balast resistor or anything. This one has me stumped. Any other ideas?
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Joined: Jul 2005
Posts: 566
From: Sugar Land, Texas
RE: New fuel sending unit in
Glen...I know when my boy's sending unit was replaced, we had to adjust the float arm on the new unit. That is, IIRC there is a screw at the base to loosen and adjust the float so the level will read correctly. Then tighten the screw and hope you get a correct reading. Luckily, the 1st adjust we made did the trick and gives a relatively accurate reading on the gauge.
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RE: New fuel sending unit in
ORIGINAL: Cogtx
Glen...I know when my boy's sending unit was replaced, we had to adjust the float arm on the new unit. That is, IIRC there is a screw at the base to loosen and adjust the float so the level will read correctly. Then tighten the screw and hope you get a correct reading. Luckily, the 1st adjust we made did the trick and gives a relatively accurate reading on the gauge.
Glen...I know when my boy's sending unit was replaced, we had to adjust the float arm on the new unit. That is, IIRC there is a screw at the base to loosen and adjust the float so the level will read correctly. Then tighten the screw and hope you get a correct reading. Luckily, the 1st adjust we made did the trick and gives a relatively accurate reading on the gauge.
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RE: New fuel sending unit in
ORIGINAL: ponyx2
Take the feed wire off of the sending unit, ground it and see if the gauge goes to full. If it does, the sending unit is bad
Take the feed wire off of the sending unit, ground it and see if the gauge goes to full. If it does, the sending unit is bad
2nd Gear Member
Joined: Jul 2006
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RE: New fuel sending unit in
You could try grounding it right at the gauge. This should eliminate the wiring, which doesn't seem to be a likely culprit anyway. You could try cleaning the connections at the back of the gauge; that could create a high resistance as well. Before springing for a new gauge, I would check every other possibility first. I've even taken some gauges apart and resoldered connections. Besides the original gauge construction has a certain beauty to it that you don't get with modern circuit boards, IMO.
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RE: New fuel sending unit in
ORIGINAL: Lumbergh
You could try grounding it right at the gauge. This should eliminate the wiring, which doesn't seem to be a likely culprit anyway. You could try cleaning the connections at the back of the gauge; that could create a high resistance as well. Before springing for a new gauge, I would check every other possibility first. I've even taken some gauges apart and resoldered connections. Besides the original gauge construction has a certain beauty to it that you don't get with modern circuit boards, IMO.
You could try grounding it right at the gauge. This should eliminate the wiring, which doesn't seem to be a likely culprit anyway. You could try cleaning the connections at the back of the gauge; that could create a high resistance as well. Before springing for a new gauge, I would check every other possibility first. I've even taken some gauges apart and resoldered connections. Besides the original gauge construction has a certain beauty to it that you don't get with modern circuit boards, IMO.
If mine doesn't clean up and give me a good reading, I'll see what the replacement one does.
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