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#1 |
Registered User
Join Date: Jul 2009
Location: washington
Posts: 4,178
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My gas gauge isn't reading anything and the needle limp. I have two good verified gas gauges my printed circuit board is good and my switch was working fine last week. All I did was change my mechanical oil press and water temp gauges to sunpro and drive it for a week with no gauges. I don't know what the hell is going on but with the way this thing eats gas I NEED my fuel gauge working
Posted via Mobile Device It's an 86 with duel tanks if that helps
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#2 |
Registered User
Join Date: Feb 2012
Location: Lakeway, TX
Posts: 335
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Re: Gas gauge issues
bad ground?
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#3 |
Registered User
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Location: sparta tennessee
Posts: 345
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Re: Gas gauge issues
remove sender wire at tank Guage should go past full Ground sender wire guage should go past empty If not guage or wire to guage bad
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#4 |
Registered User
Join Date: Oct 2011
Location: fortwayne, indiana
Posts: 209
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Re: Gas gauge issues
anyone have the wire diagram for the dual tanks my 88 was efi but the guy i got it from changed it over to carb it would be nice to get both tanks working and the gauge reading
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88 gmc v3500 bonus cab classy chassy conversion, 454, nv4500, np205, dana 60 front with spool, 14 bolt ff cac rear with locker. |
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#5 | |
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Location: Wentworth, NH
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Re: Gas gauge issues
Quote:
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1959 M35A2 LDT465-1D SOLD 1967 Dodge W200 B383, NP420/NP201 SOLD 1969 Dodge Polara 500 B383, A833 SOLD 1972 Ford F250 FE390, NP435/NP205 SOLD 1976 Chevy K20, 6.5L, NV4500/NP208 SOLD 1986 M1008 CUCV SOLD 2000 GMC C2500, TD6.5L, NV4500 2005 Chevy Silverado LS 2500HD 6.0L 4L80E/NP263 2009 Impala SS LS4 V8 RTFM... GM Parts Books, GM Schematics, GM service manuals, and GM training materials...
And please let us know if and how your repairs were successful. |
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#6 |
Registered User
Join Date: Jul 2009
Location: washington
Posts: 4,178
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Re: Gas gauge issues
I pulled the gauge and have two other good gas gauges that I jumped directly to the harnes plug and still no gauge movement or anything and I doubt that both sending units in both tanks went completely bad at the same time. I can flip the switch and hear the diverter valve working so the switch still has to be good idk what else it can possibly be
Posted via Mobile Device
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#7 | |
Moderator
![]() Join Date: Oct 2008
Location: Wentworth, NH
Posts: 4,950
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Re: Gas gauge issues
Quote:
In 86 the valve picked which sender feeds the gauge. At the valve plug the solid pink wire is the gauge feed and the pink wires with stripes are the senders. Unplug the valve and switch the ignition on. If this nails the gauge at 3:00 then the pink wire is OK. Bypass the valve sender switch as a test. Jumper the Right Hand sender wire, Pink with Black stripe, to the Solid Pink wire using a jumper wire and the proper mating gender weatherpack pins. Check the gauge with the ignition on. Repeat for the Left Hand Sender wire. If this works the switch inside the valve has gone bad. If not you narrowed it down to one or both sender wires.
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1959 M35A2 LDT465-1D SOLD 1967 Dodge W200 B383, NP420/NP201 SOLD 1969 Dodge Polara 500 B383, A833 SOLD 1972 Ford F250 FE390, NP435/NP205 SOLD 1976 Chevy K20, 6.5L, NV4500/NP208 SOLD 1986 M1008 CUCV SOLD 2000 GMC C2500, TD6.5L, NV4500 2005 Chevy Silverado LS 2500HD 6.0L 4L80E/NP263 2009 Impala SS LS4 V8 RTFM... GM Parts Books, GM Schematics, GM service manuals, and GM training materials...
And please let us know if and how your repairs were successful. |
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#8 |
Registered User
Join Date: Jan 2011
Location: Port Coquitlam, BC
Posts: 202
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Re: Gas gauge issues
When you say you jumped them directly to the harness plug, do you mean the harness into the instrument cluster or the harness on the diverter valve? If you mean the instrument cluster, you might have a break in the wire between the fuel tank and instrument cluster. Trace the wire from the fuel tank to Tue selector valve and jump it there, and work your way forward.
Posted via Mobile Device
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#9 |
Registered User
Join Date: Oct 2003
Location: houston, texas
Posts: 1,974
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Re: Gas gauge issues
when you painted the skull on it you killed it lol
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2008 Silverado Z71 RCSB 1991 GMC Jimmy 4x4 1976 GMC Sierra C15 SWB |
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#10 |
Registered User
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Location: sparta tennessee
Posts: 345
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Re: Gas gauge issues
If wire was broken between guage and tank it would read past full Remove the dash guage and with a test light and key on 1 terminal should check hot Then clip the test light to a hot termimal and touch the other 2 terminals 1 should light the light bright It will be the ground Touch the third and it will probally light dimmer or slight pulsate where sender is reading ground resistance It sounds like you have either no 12v or no ground at the guage
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#11 |
78K & 79C Jimmys
Join Date: Nov 2009
Location: Ottawa Ont CANADA
Posts: 7,901
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Re: Gas gauge issues
Yes,
sender off should be over full grounded would be E if no movement,I'd confirm the power and ground to gauge are good sounds like a good time to bypass it and have a manual choice of which tank to read good for those Earnhardt pit stops lol
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#12 |
Registered User
Join Date: Oct 2003
Location: houston, texas
Posts: 1,974
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Re: Gas gauge issues
did it work before you took apart and painted on it?
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2008 Silverado Z71 RCSB 1991 GMC Jimmy 4x4 1976 GMC Sierra C15 SWB |
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#13 |
Registered User
Join Date: Jul 2009
Location: washington
Posts: 4,178
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Re: Gas gauge issues
Yah it all worked fine before everything pulled apart. All I changed was the gauge face and the Equuis gauges with sunpro and then added a clock.
When everything is plugged in the needle is limp like there is no power if I hit the switch to swap tanks nothing happens but you can hear the diverter valve work and it was working last week. Hatzie I looked earlier in your sig and didnt find much for wiring stuff since my iPhone wont show it all Posted via Mobile Device
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377 sbc thumpr cam autogear m23 muncie 3:73 Detroit trutrac 3''spintech prostreet mufflers xpipe 1 3/4 headers build thread !http://67-72chevytrucks.com/vboard/s...d.php?t=577217 Iroc gauge threadhttp://67-72chevytrucks.com/vboard/s...d.php?t=554511 |
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#14 |
Registered User
![]() Join Date: Dec 2012
Location: sparta tennessee
Posts: 345
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Re: Gas gauge issues
check your printed circuit at the back of the guages at the silver snap in clips You are not getting 12v or ground also check your guage fuze
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#15 | |
Moderator
![]() Join Date: Oct 2008
Location: Wentworth, NH
Posts: 4,950
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Re: Gas gauge issues
Quote:
ST_352_86_1986_Chevrolet_GMC_Light_Truck_Wiring_Manual_CK_10_30_Only.pdf
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1959 M35A2 LDT465-1D SOLD 1967 Dodge W200 B383, NP420/NP201 SOLD 1969 Dodge Polara 500 B383, A833 SOLD 1972 Ford F250 FE390, NP435/NP205 SOLD 1976 Chevy K20, 6.5L, NV4500/NP208 SOLD 1986 M1008 CUCV SOLD 2000 GMC C2500, TD6.5L, NV4500 2005 Chevy Silverado LS 2500HD 6.0L 4L80E/NP263 2009 Impala SS LS4 V8 RTFM... GM Parts Books, GM Schematics, GM service manuals, and GM training materials...
And please let us know if and how your repairs were successful. |
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#16 |
Registered User
![]() Join Date: Dec 2012
Location: sparta tennessee
Posts: 345
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Re: Gas gauge issues
yes there is a guage fuze
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#17 |
Registered User
Join Date: Jul 2009
Location: washington
Posts: 4,178
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Re: Gas gauge issues
I'm getting gauge lights but is there a diff fuze for gauges? I checked circuit board for continuity and it checked out. But I'm not getting 12v off the fuel system wiring from the clip that goes to the gauge bezel
Posted via Mobile Device
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377 sbc thumpr cam autogear m23 muncie 3:73 Detroit trutrac 3''spintech prostreet mufflers xpipe 1 3/4 headers build thread !http://67-72chevytrucks.com/vboard/s...d.php?t=577217 Iroc gauge threadhttp://67-72chevytrucks.com/vboard/s...d.php?t=554511 |
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#18 |
Registered User
Join Date: Jul 2009
Location: washington
Posts: 4,178
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Re: Gas gauge issues
Yah the fuze keeps blowing idk why
Posted via Mobile Device
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377 sbc thumpr cam autogear m23 muncie 3:73 Detroit trutrac 3''spintech prostreet mufflers xpipe 1 3/4 headers build thread !http://67-72chevytrucks.com/vboard/s...d.php?t=577217 Iroc gauge threadhttp://67-72chevytrucks.com/vboard/s...d.php?t=554511 |
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#19 |
Registered User
![]() Join Date: Dec 2012
Location: sparta tennessee
Posts: 345
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Re: Gas gauge issues
First thing Unplug the big plug from cluster and replace fuze If it blows you have wiring problems in main harness If not short is in cluster I would check is where you installed the aftermarket guages in the panel Check and see if they are shorting against the origional printed curcuit
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#20 |
Registered User
![]() Join Date: Dec 2012
Location: sparta tennessee
Posts: 345
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Re: Gas gauge issues
I noticed you had a factory tach If you added that to your cluster without changin to matching printed curcuit you will have all kinds of problems
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#21 |
Registered User
Join Date: Jul 2009
Location: washington
Posts: 4,178
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Re: Gas gauge issues
It's fixed there was a wire rubbed raw and shorting and blowing the fuze.
Hatzie the diagram was helpfull thanks for the help guys Ile get pics up when it's all together Posted via Mobile Device
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377 sbc thumpr cam autogear m23 muncie 3:73 Detroit trutrac 3''spintech prostreet mufflers xpipe 1 3/4 headers build thread !http://67-72chevytrucks.com/vboard/s...d.php?t=577217 Iroc gauge threadhttp://67-72chevytrucks.com/vboard/s...d.php?t=554511 |
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#22 |
Registered User
Join Date: Jul 2009
Location: washington
Posts: 4,178
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Re: Gas gauge issues
Finished product
![]() Posted via Mobile Device
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377 sbc thumpr cam autogear m23 muncie 3:73 Detroit trutrac 3''spintech prostreet mufflers xpipe 1 3/4 headers build thread !http://67-72chevytrucks.com/vboard/s...d.php?t=577217 Iroc gauge threadhttp://67-72chevytrucks.com/vboard/s...d.php?t=554511 |
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