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  '64 1/2 to '73 -- The Classic Mustang
  fuel guage problem

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Author Topic:   fuel guage problem
mtucker
Journeyman

Posts: 93
From: Wichita, KS
Registered: Oct 2002

posted 12-20-2002 02:53 PM     Click Here to See the Profile for mtucker   Click Here to Email mtucker     Edit/Delete Message   Reply w/Quote
My fuel guage quit working. Is there any way to diagnose whether it's the fuel sender or an open circuit? If it's the sender, how do I replace that?

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skiwater
Journeyman

Posts: 19
From: Utah
Registered: Nov 2002

posted 12-20-2002 04:35 PM     Click Here to See the Profile for skiwater   Click Here to Email skiwater     Edit/Delete Message   Reply w/Quote
You can use an ohm meter to test the resistance on your sender. If I remember correctly it is set for 10 ohms empty and 73 ohms full. (I may have these reversed, but I'm fairly confident those are the limits). If it does need to be changed it is an easy fix. New senders are inexpensive (I got mine from NPD for somewhere around $24.00. Just remove the retaining ring pull the old sender out and slide the new one in. One wire, one fuel line to hook up. Easy peasy. I would reccomend getting a new reataining rind when you order the new sending unit.

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mtucker
Journeyman

Posts: 93
From: Wichita, KS
Registered: Oct 2002

posted 12-20-2002 05:15 PM     Click Here to See the Profile for mtucker   Click Here to Email mtucker     Edit/Delete Message   Reply w/Quote
thanks ski, I'll give it a shot.

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69 Sportsroof
Gearhead

Posts: 1226
From: Valley, Alabama, USA
Registered: Mar 2002

posted 12-20-2002 06:06 PM     Click Here to See the Profile for 69 Sportsroof   Click Here to Email 69 Sportsroof     Edit/Delete Message   Reply w/Quote
Another thing you can do is to have someone sit in the driver's seat with the key on while you ground out the wire to the sending unit. The guage should go over to full if its the sending unit.

Before removing the old unit, I would recommend making sure the tank was close to empty.

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mtucker
Journeyman

Posts: 93
From: Wichita, KS
Registered: Oct 2002

posted 12-20-2002 08:15 PM     Click Here to See the Profile for mtucker   Click Here to Email mtucker     Edit/Delete Message   Reply w/Quote
quote:
Before removing the old unit, I would recommend making sure the tank was close to empty.

That's the catch 22. Since the guage doesn't work, I can't tell if it's close to empty.

I ohmed out the sender. It was 80 ohms. I grounded out the sender wire through a 10 ohm resister and the guage went to full. Looks a new sender for me.

I think I got a bunch of cr*p in the tank so I'll probably do a new tank and fuel line.

Thanks for all the help guys. I've been needing to troubleshoot for a while now.

[This message has been edited by mtucker (edited 12-20-2002).]

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