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04-13-2004, 01:19 PM
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#1 |
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Senior Moment
 
Join Date: Mar 2002
Location: Pittsburg Ca
Posts: 4,111
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Fuel Gage ?
My fuel gauge reads 1/4 all the time. The sending unit is good. When I remove the wire on the sender the gauge goes to full, when I put it back on it goes to 1/4.
HELP Any Ideas???? 
__________________
1970 CST LS 1 6 speed Ford 9 inch Detroit Tru Track, Dakota Didgital, Vintage Air, QA1 Coil Overs Front & Rear Lots of FUN 2013 GMC PU, Oldest Son 71 GMC LWB. QA1 Suspension, Angry SB. Youngest Son 2019 GMC Diesil Dually. Youngest Son 2017 Toyota SUV Daughters car 2018 Traverse , Wife’s Ride Pittsburg Ca 94565 |
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04-13-2004, 01:53 PM
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#2 |
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Senior Member
Join Date: Jan 2000
Location: Cincinnati, Ohio
Posts: 1,492
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I'm fighting with mine right now and it had the same symptoms. My sending unit was bad though. I hooked another sending unit up outside the tank and grounded it. It worked perfect so I determined that my old one was toast. I removed the old one from the tank and saw why (rust). I put the other one in the tank and the gage works perfect. I now have a fuel line issue....I think someone dropped a six cylinder unit in my tank at one time.
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04-13-2004, 02:01 PM
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#3 |
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Senior Member
Join Date: Jul 2001
Location: Muskegon,MI,USA
Posts: 6,026
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It sounds like you still have a problem with your sending unit. The sending unit should read 0 to 90 ohms, (0 = empty, 90 = full).
Not knowing how much gas you have, a leak in the float can cause low readings when your tank is 1/4 or more full. Jim |
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04-13-2004, 02:22 PM
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#4 |
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Senior Moment
Join Date: Mar 2002
Location: Pittsburg Ca
Posts: 4,111
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ohms are OK. Are there any grounds on the tank of gauge I should be looking for ?
__________________
1970 CST LS 1 6 speed Ford 9 inch Detroit Tru Track, Dakota Didgital, Vintage Air, QA1 Coil Overs Front & Rear Lots of FUN 2013 GMC PU, Oldest Son 71 GMC LWB. QA1 Suspension, Angry SB. Youngest Son 2019 GMC Diesil Dually. Youngest Son 2017 Toyota SUV Daughters car 2018 Traverse , Wife’s Ride Pittsburg Ca 94565 |
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04-13-2004, 02:38 PM
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#5 |
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Senior Member
Join Date: Jul 2001
Location: Muskegon,MI,USA
Posts: 6,026
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If the tank or sending unit were not grounded, the gauge would read full at all times.
Are you saying that you checked the tank unit, moved it through its range and it reads 0 ohms when the float is all the way down and 90 ohms when the float is all the way up? What happens if you ground the sending unit wire? Gauge should read empty. Jim |
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04-13-2004, 02:44 PM
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#6 |
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Senior Moment
Join Date: Mar 2002
Location: Pittsburg Ca
Posts: 4,111
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I have not tried that(grounding the sender wire). If it doesnt read empty???? Guess I'll retest my sender. Last I had it out the ohms read fine.
__________________
1970 CST LS 1 6 speed Ford 9 inch Detroit Tru Track, Dakota Didgital, Vintage Air, QA1 Coil Overs Front & Rear Lots of FUN 2013 GMC PU, Oldest Son 71 GMC LWB. QA1 Suspension, Angry SB. Youngest Son 2019 GMC Diesil Dually. Youngest Son 2017 Toyota SUV Daughters car 2018 Traverse , Wife’s Ride Pittsburg Ca 94565 |
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04-13-2004, 05:31 PM
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#7 |
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Senior Moment
Join Date: Mar 2002
Location: Pittsburg Ca
Posts: 4,111
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ttt
__________________
1970 CST LS 1 6 speed Ford 9 inch Detroit Tru Track, Dakota Didgital, Vintage Air, QA1 Coil Overs Front & Rear Lots of FUN 2013 GMC PU, Oldest Son 71 GMC LWB. QA1 Suspension, Angry SB. Youngest Son 2019 GMC Diesil Dually. Youngest Son 2017 Toyota SUV Daughters car 2018 Traverse , Wife’s Ride Pittsburg Ca 94565 |
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04-13-2004, 06:09 PM
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#8 |
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Registered User
Join Date: Apr 2004
Location: N.E. MO
Posts: 1,749
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I'd check out the wire. I had a problem with a fuel guage quite a few years back and it was the wire itself. It had been spliced but not soldered.
__________________
72 C20 4X4 454 4 speed 89 Trans Am (was) 305 TPI 700r4 93 C1500 2wd Extended cab 350 700r4 98 Sonoma (TPI outa the Trans Am) 03 Yamaha 660 Raptor 03/04 660 Raptor 07 700 Raptor 85 Honda Odyssey |
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04-13-2004, 11:23 PM
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#9 |
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its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,693
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If the needle stays on one spot on the guage, then there is a strong chance that your guage is not getting power to it. (not the ground side...12 volts)
Pull the insterment panel, and look at the circuit card on the back. Follow the lines from the posts on the back of the fuel guage to where they go to the plug. You are looking for an open or break in the line. |
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04-14-2004, 01:55 PM
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#10 |
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Registered User
Join Date: Jun 2002
Location: Knoxville Tenn.
Posts: 3,058
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Be willing to bet it is the resistor on back of your gauge. Remove it from gauge and check it with your ohm meter-no reading =bad. Just fixed one in a 72 a couple of weeks ago that reading just like yours-1/4 no matter how full it was.
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56 Chevy Bel-Air 2dr. HT (purchased new) 71 Chevy Cheyenne SWB PU (502HO) 65 GMC short bed step--work in progress and my gofer |
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04-14-2004, 02:16 PM
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#11 |
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Registered User
Join Date: Jun 2002
Location: Knoxville Tenn.
Posts: 3,058
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http://67-72chevytrucks.com/vboard/s...ght=fuel+gauge
Check this thread under my username (jhow66)-it will explain it better.
__________________
56 Chevy Bel-Air 2dr. HT (purchased new) 71 Chevy Cheyenne SWB PU (502HO) 65 GMC short bed step--work in progress and my gofer |
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04-14-2004, 02:50 PM
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#12 |
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Senior Moment
Join Date: Mar 2002
Location: Pittsburg Ca
Posts: 4,111
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I have a resitor on order just in case. Thanks ALL for the info
__________________
1970 CST LS 1 6 speed Ford 9 inch Detroit Tru Track, Dakota Didgital, Vintage Air, QA1 Coil Overs Front & Rear Lots of FUN 2013 GMC PU, Oldest Son 71 GMC LWB. QA1 Suspension, Angry SB. Youngest Son 2019 GMC Diesil Dually. Youngest Son 2017 Toyota SUV Daughters car 2018 Traverse , Wife’s Ride Pittsburg Ca 94565 |
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