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#1 |
Registered User
Join Date: Jun 2014
Location: SM California
Posts: 7
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72 Blazer K5 Fuel Gage Stuck On Empty.
Recently been having a fuel gage problem. The gage was reading past full at the 3 o clock position.
Just bought a new gas tank and sending unit. Installed it Last night. Put 5 gallons of gas in the tank and now it is Stuck on E and not reading at all. Anybody have any ideas of what's going on. Thanks. |
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#2 |
Registered User
Join Date: May 2007
Location: Marion, Mi.
Posts: 2,429
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Re: 72 Blazer K5 Fuel Gage Stuck On Empty.
Recheck the ground wire.
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#3 |
Registered User
Join Date: Jun 2014
Location: SM California
Posts: 7
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Re: 72 Blazer K5 Fuel Gage Stuck On Empty.
Checked the ground and it's good. Drove it around today and the fuel gauge is Stuck at 3 o clock again. Now I'm back in the same boat I was before. Anyone know what the problem cold be?
HELP!! |
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#4 |
Registered User
Join Date: Feb 2011
Location: Idaho
Posts: 305
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Re: 72 Blazer K5 Fuel Gage Stuck On Empty.
I know you said you checked the ground, but after new SU and tank... it's likely the ground.
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#5 |
Registered User
Join Date: Dec 2012
Location: Trinity, Florida
Posts: 104
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Re: 72 Blazer K5 Fuel Gage Stuck On Empty.
If it's grounded correctly.. it might be your fuel sending unit..probably need a new one....but it's usually related to the ground almost 95% of the time.
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1972 Chevy Blazer ![]() Check out my build: http://67-72chevytrucks.com/vboard/s...d.php?t=560741 |
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#6 |
Registered User
Join Date: Jun 2014
Location: SM California
Posts: 7
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Re: 72 Blazer K5 Fuel Gage Stuck On Empty.
Can the sending unit possibly be bad if it's brand new? Will check the ground again.
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#7 | |
Cluster King
![]() Join Date: Nov 2012
Location: Junction City, OR
Posts: 5,263
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Re: 72 Blazer K5 Fuel Gage Stuck On Empty.
Quote:
How much gas to you think is in the tank now? It should read about 1/4 tank with 5 gallons. If you turn the ignition to the run position, reach up behind the cluster and wiggle the connector where it plugs in to the circuit board and watch the gauge to see if it moves around or not. You also have 2 grounds to be concerned with. The sending unit needs to have a good ground to the frame. There is also ground on the gauge that comes from the connector that plugs into the circuit board. The ground wire is black and is located in pin number 7 of the connector (if you have a full gauge cluster) On the back of the gauge there are 3 studs. One one the left (looking at the front of the gauge) is power from ignition, the one one the right is from the sender (not the ground, should be a tan wire) and the middle lower one is ground. You can use the lower middle stud and try a temporary ground there and see what happens. Keep use posted. Tom
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Contact me on all of your gauge cluster needs. I specialize in restoration, repair and parts sales for 67-72 Chevy and GMC trucks. email me at tbonegarris@yahoo.com I am also a dealer for Counterpart for gauge cluster parts only. Also see my facebook page, CG&C |
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#8 |
Back in the sticks
Join Date: Jan 2001
Location: Fordland, MO
Posts: 3,188
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Re: 72 Blazer K5 Fuel Gage Stuck On Empty.
Had the same problem when I put my new sending unit in, turned out the fuse in the fuse block had blown and it only affected the gas guage. Check the fuse.
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1971 Cheyenne C-10 w/700R4 and Tuned Port Injection 1969 K5 Blazer w/Tuned Port 2010 2SS/RS Flaming Orange Camaro 2011 K1500 Suburban 2014 K1500 Pickup 2008 Nissan Altima? The wifes' hoopty |
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#9 |
Registered User
Join Date: Jun 2014
Location: SM California
Posts: 7
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Re: 72 Blazer K5 Fuel Gage Stuck On Empty.
Drove the car around last night. And the needle went back to E. It has gas in it. Think it could be the gas gauge itself?
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#10 |
Registered User
Join Date: Dec 2012
Location: Trinity, Florida
Posts: 104
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Re: 72 Blazer K5 Fuel Gage Stuck On Empty.
at this point it sounds possesed...I think your gonna need to get a priest involved.
__________________
1972 Chevy Blazer ![]() Check out my build: http://67-72chevytrucks.com/vboard/s...d.php?t=560741 |
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#11 |
Registered User
Join Date: Nov 2013
Location: Oakland, CA
Posts: 34
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Re: 72 Blazer K5 Fuel Gage Stuck On Empty.
I am having the same issue with my 70 jimmy. the ground coming off the sending unit was iffy at best. After cleaning and a little sanding I had a good ground. The gas gauge still didn't move from the 1/4 postion. Checked the fuse box and there was no fuse but instead had 2 blade plugs. I switched the plugs then the tank read a little past full and didn't move. Had it in the shop and the shop removed the tank and told me that they ordered a new sending unit and was just waiting to get it. A week later the shop tells me they tested the sending unit and it worked so they put it back in the tank before talking to me and of course the gauge still doesn't work. Now I can check the ground off the gauge and see if that is problem. Thanks for the info.
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#12 |
Active Member
![]() Join Date: Jun 2013
Location: Cedar Crest, NM
Posts: 199
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Re: 72 Blazer K5 Fuel Gage Stuck On Empty.
Artie, all these suggestions are correct. I had the same problem. Found the test threads and did most of them. I did replace the sending unit because it wasn't quite to specs and old and the new one has the plastic float. Turns out that when I clipped on another ground, it started working right! I fixed the two factory grounds and it's done.
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72 Blazer, 70 El Camino SS, Anniversary HD FatBoy, 2020 Ram 2500, 80 Vette, 65 Chevy 3/4 Ton 4 W/D Pickup and some more. Wife: 06 GMC Duramax 3500 4WD Single Wheel Next: Rust removal on my Blazer. Thinking of putting a 50 Chevy cab on a 76 Chev 4 WD pickup. ![]() Members Met: Aldtime, DeadheadNM |
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