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Author
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Topic: fuel guage problem
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mtucker
Journeyman Posts: 93
From: Wichita, KS
Registered: Oct 2002
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posted 12-20-2002 02:53 PM
   
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
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posted 12-20-2002 04:35 PM
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.------------------
'68 coupe
302 stroked to 347
Edelbrock performer rpm aluminum heads ported and polished
edelbrock rpm airgap intake
Holley HP 750
Hooker super comp headers
.355 posi rear
Mcleod clutch
Tremec 3550
MSD ignition
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mtucker
Journeyman Posts: 93
From: Wichita, KS
Registered: Oct 2002
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posted 12-20-2002 05:15 PM
thanks ski, I'll give it a shot.
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69 Sportsroof
Gearhead Posts: 1226
From: Valley, Alabama, USA
Registered: Mar 2002
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posted 12-20-2002 06:06 PM
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
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posted 12-20-2002 08:15 PM
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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