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#1 |
Registered User
Join Date: Nov 2017
Location: H, Q
Posts: 180
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Greetings
1. My friend’s 1968 GMC Sierra fuel gauge is not working, I checked the wire from sending unit to the fuse box it was good, however the wire connection to the fuel box have no electricity at all (it plugs to the top of the fuse box it indicates fuel gauge) Anyone knows why no electricity and how to check/fix/resolve it? 2. As I know, the 1968-1972 sending unit has only one fuel port that goes to the fuel pump, this truck has 2 ports, one is venting hose, however it’s inside the cab, and cab smells fuel. Do I cap it, or do I extend the hose to outside and where? Note: this truck is fully restored. Thanks
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1972 GMC Sierra C2500, V8-350 1986 GMC Sierra C2500, V8-454 1986 GMC Sierra C2500, V8-LS1 1986 GMC Sierra K2500, V8-350 1987 GMC Sierra R3500, V8-454 1997 GMC Sierra K2500, V8-454 |
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#2 |
Post Whore
![]() Join Date: Feb 2016
Location: Portland Oregon
Posts: 11,158
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Re: 68 GMC Sierra fuel gage/electric
This should get you through your fuel guage issue.
http://67-72chevytrucks.com/vboard/s...d.php?t=640615 I am not much help with the fuel port, except to encourage you to do a search using the box above. I know there are lots of threads about this. Year and whether it was a California truck make a difference too. Good luck.
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Thanks to Bob and Jeanie and everyone else at Superior Performance for all their great help. ![]() RIP Bob Parks. 1967 Burban (the WMB),1988 S10 Blazer (the Stink10 II),1969 GTO (the Goat), 1970 Javelin, 1952 F2 Ford OHC six 4X4, 29 Model A, 72 Firebird (the DBP Bird). 85 Alfa Romeo If it breaks I didn't want it in the first place The WMB repair thread http://67-72chevytrucks.com/vboard/s...d.php?t=698377 |
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#3 |
Registered User
Join Date: Nov 2017
Location: H, Q
Posts: 180
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Re: 68 GMC Sierra fuel gage/electric
HO455, thanks for your help
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1972 GMC Sierra C2500, V8-350 1986 GMC Sierra C2500, V8-454 1986 GMC Sierra C2500, V8-LS1 1986 GMC Sierra K2500, V8-350 1987 GMC Sierra R3500, V8-454 1997 GMC Sierra K2500, V8-454 |
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#4 |
Special Order
![]() ![]() Join Date: Nov 2004
Location: Mt Airy, MD
Posts: 85,858
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Re: 68 GMC Sierra fuel gage/electric
Just so you know, there was no such thing as a GMC Sierra in '68. That trim package came along later.
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"BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~ |
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#5 |
Registered User
Join Date: Oct 2008
Location: Marianna Arkansas
Posts: 7,270
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Re: 68 GMC Sierra fuel gage/electric
The sender with two ports is for a 72 if I remember correctly that extra would go the the purge canister witch you don't have . BUT if you have the right gas cap for your year it is vented and then if that indeed is the case you can plug that port with a vac cap no problem. Jim
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#6 | |
Registered User
Join Date: Nov 2017
Location: H, Q
Posts: 180
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Re: 68 GMC Sierra fuel gage/electric
Quote:
For this truck, I’m not sure about fuel cap.
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1972 GMC Sierra C2500, V8-350 1986 GMC Sierra C2500, V8-454 1986 GMC Sierra C2500, V8-LS1 1986 GMC Sierra K2500, V8-350 1987 GMC Sierra R3500, V8-454 1997 GMC Sierra K2500, V8-454 |
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#7 | |
Registered User
Join Date: Nov 2017
Location: H, Q
Posts: 180
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Re: 68 GMC Sierra fuel gage/electric
Quote:
This one has Sierra Grande on the side, and on the glove compartment,
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1972 GMC Sierra C2500, V8-350 1986 GMC Sierra C2500, V8-454 1986 GMC Sierra C2500, V8-LS1 1986 GMC Sierra K2500, V8-350 1987 GMC Sierra R3500, V8-454 1997 GMC Sierra K2500, V8-454 |
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#8 |
Senior Member
![]() Join Date: Nov 2018
Location: Waterford California
Posts: 2,534
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Re: 68 GMC Sierra fuel gage/electric
The wire to the top of the tank is a ground wire, the 12 volts comes into play behind the dash at the gauge and to the fuse panel.
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#9 |
Registered User
Join Date: Nov 2017
Location: H, Q
Posts: 180
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Re: 68 GMC Sierra fuel gage/electric
The problem is that no indication at the fuel gage, the fuse beside where the Tan wire (coming from sending unit) is not workin. My knowledge this wire your taking about (on top of sending unit) should be the 12v, sending unit is grounded by the tank.
Temp gauge is moving slightly when engine is idling
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1972 GMC Sierra C2500, V8-350 1986 GMC Sierra C2500, V8-454 1986 GMC Sierra C2500, V8-LS1 1986 GMC Sierra K2500, V8-350 1987 GMC Sierra R3500, V8-454 1997 GMC Sierra K2500, V8-454 |
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#10 | |
Senior Member
![]() Join Date: Nov 2018
Location: Waterford California
Posts: 2,534
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Re: 68 GMC Sierra fuel gage/electric
Quote:
https://auto.howstuffworks.com/fuel-gauge1.htm |
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