Haunted Fuel Gauge!!! - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Pumkin Truck · 08-06-2002, 05:31 PM

What is the deal with my fuel gauge? I turn the key to the on position and the pointer goes half a tank past full. Then I turned the truck on and the pointer went back to empty where it was (and always is). Whats with that?

Jmac05 · 08-06-2002, 05:38 PM

Maybe the radiation from your glowing pumpkin whacked it out.
You may have a bad sending unit. I had a nissan that was fin until you got to half a tank, then it just fell to E. That's what the problem with my old nissan.

palallin · 08-06-2002, 05:58 PM

Check the wiring to the sending unit, and check the ground. A friend of mine gives the foloowing four step process for trouble shooting electrical problems:

1) Check the ground.
2) Check the ground.
3) Check all the other wires for unwanted ground.
4) Check the ground.

PrimeredThunder · 08-06-2002, 06:14 PM

I found tis problem in the fuel cell in my 72' when I bought the truck. It turned out to be a bad sending unit. So after I replaced the unit, the gauge was stil jumpy when the fuel would slosh around in the tank. The easy fix to a jumpy needle was a good ground. Hope this helps.

Kenny

Pumkin Truck · 08-06-2002, 07:17 PM

Hmm...2/3 say the problem lies with the ground...Nah I'm thinkin the radiation from my glowing pumpkin is makin it jumpy!

thanks all

SWINGSAX68 · 08-06-2002, 08:31 PM

where would the ground be for the fuel gauge?????

AK70SWB · 08-06-2002, 09:51 PM

what if your fuel gage never moves what is that?
andy

**68SWB4x4** · 08-06-2002, 10:15 PM

a very efficent engine

JHickson6 · 08-06-2002, 10:27 PM

I'm not sure if anyone has mentioned this yet but what about the "ground" ???

AK70SWB · 08-06-2002, 10:33 PM

kick a$$ so i never need to fill my truck up with gas-- this board rules!!!

SWINGSAX68 · 08-06-2002, 10:49 PM

Quote:

Originally posted by JHickson6
I'm not sure if anyone has mentioned this yet but what about the "ground" ???

I mentioned this above these guys are too busy talking about their needles........geeeeeeeeeez

JHickson6,
Maybe this will get there attention....

WHERE IS THE GROUND FOR THE FUEL GAUGE?!??!?!??!

Pumkin Truck · 08-07-2002, 02:48 PM

THATS WHAT I'M TRYING TO FIGURE OUT TOO!!!

Patrick Sullivan · 08-07-2002, 02:59 PM

I assume we're talking about the tank behind the seat.

It doesn't have a ground wire (at least mine doesn't), it grounds through the tank itself, probably through the bolts that hold the tank to the cab. I'm not exactly sure how you'd go about grounding it any better..

**MikeB** · 08-07-2002, 10:19 PM

Don't forget the brass float in the tank. Mine was leaking and did weird stuff depending on the gas tank level and temperature. Turned out it had a little gas in it. You can buy the float or entire sending unit from any of the 67-72 parts vendors.

palallin · 08-07-2002, 11:03 PM

Quote:

Originally posted by Patrick Sullivan
I assume we're talking about the tank behind the seat.

It doesn't have a ground wire (at least mine doesn't), it grounds through the tank itself, probably through the bolts that hold the tank to the cab. I'm not exactly sure how you'd go about grounding it any better..

You ground it better by pulling the bolts out, cleaning the rust out of the threads and from around the holes, and putting the clean bolts back in.

Of course, the ground could also be iffy around the sending unit.

Then again, as I said before, it could be the sending wire, too.

08-06-2002, 05:31 PM	#1
Pumkin Truck Thats just prime! Join Date: Mar 2002 Location: TEXAS Posts: 720	Haunted Fuel Gauge!!! What is the deal with my fuel gauge? I turn the key to the on position and the pointer goes half a tank past full. Then I turned the truck on and the pointer went back to empty where it was (and always is). Whats with that? __________________ 69 GMC short bed stepside with a wimpy six that can barely pull itself. 99 Chevrolet Camaro Z-28 1 Bad 5.7ltr LS1

08-06-2002, 05:38 PM	#2
Jmac05 L.E.D. Tail lights, Baby! Join Date: Jan 2002 Location: Corona, Ca Posts: 290	Maybe the radiation from your glowing pumpkin whacked it out. You may have a bad sending unit. I had a nissan that was fin until you got to half a tank, then it just fell to E. That's what the problem with my old nissan. __________________ *Prov 3:5-8* "Hook 'em" L.E.D. Taillights for sale NOW!!! If interested, visit: www.earlyclassic.com or our website: www.jmcled.com All 67-72 GM Taillights are on sale untill 5 p.m. on Dec 15th, with Guaranteed Christmas delivery! joel.mcwaters@jmcled.com

08-06-2002, 05:58 PM	#3
palallin Registered User Join Date: Jul 2002 Location: St. James, MO Posts: 1,238	Check the wiring to the sending unit, and check the ground. A friend of mine gives the foloowing four step process for trouble shooting electrical problems: 1) Check the ground. 2) Check the ground. 3) Check all the other wires for unwanted ground. 4) Check the ground. __________________ '69 Longstep K-10: 327/SM465/T-221/Closed Knuckle Dana44/12-bolt.

08-06-2002, 06:14 PM	#4
PrimeredThunder Back from the Dead Join Date: Dec 2001 Location: Salem, Oregon Posts: 522	I found tis problem in the fuel cell in my 72' when I bought the truck. It turned out to be a bad sending unit. So after I replaced the unit, the gauge was stil jumpy when the fuel would slosh around in the tank. The easy fix to a jumpy needle was a good ground. Hope this helps. Kenny __________________ The only Carb that matters to me is the one under my hood! Salem, Oregon

08-06-2002, 07:17 PM	#5
Pumkin Truck Thats just prime! Join Date: Mar 2002 Location: TEXAS Posts: 720	Hmm...2/3 say the problem lies with the ground...Nah I'm thinkin the radiation from my glowing pumpkin is makin it jumpy! thanks all __________________ 69 GMC short bed stepside with a wimpy six that can barely pull itself. 99 Chevrolet Camaro Z-28 1 Bad 5.7ltr LS1

08-06-2002, 08:31 PM	#6
SWINGSAX68 Now the others dig........ Join Date: May 2002 Location: San Antonio, TX Posts: 1,520	where would the ground be for the fuel gauge????? __________________ 68 Chevy C10 Stepside Black Primer 78 GMC Longbed White 09 Chevy Silverado Shortbed Granite Blue *LOOKING FOR A 67 4 DOOR IMPALA!!!Just like Sam and Dean Winchester!! 'Cause Mustangs are for p^#$ and you can fit a body in the trunk of a 67 Impala* MEMBER OF THE DRUM BRAKE CLUB Bachelor of Music in Jazz Studies Texas State University-San Marcos, TX Certified Music Educator I hope Mom is up there watching and being my Guardian Angel "I've got a fever.....and the only prescription.....IS MORE COW BELL" -The Legendary: Bruce Dickenson "F#$@ 'em up!!!!!!" -The Legendary: Rogelio Escobar TRUCKY LINKS** http://67-72chevytrucks.com/vboard/s...d.php?t=457750 http://67-72chevytrucks.com/vboard/s...d.php?t=461184 http://67-72chevytrucks.com/vboard/s...d.php?t=472848 http://67-72chevytrucks.com/vboard/s...d.php?t=417541 http://67-72chevytrucks.com/vboard/s...d.php?t=477788

08-06-2002, 09:51 PM	#7
AK70SWB Registered User Join Date: Jun 2002 Location: SPRINGFIELD MO. Posts: 126	what if your fuel gage never moves what is that? andy __________________ the sun even shines on a dogs a$$ some days!!!

08-06-2002, 10:15 PM	#8
68SWB4x4 Strongman Garage Join Date: Apr 2000 Location: Salinas, CA Posts: 10,241	a very efficent engine __________________ Kalle 68 GMC Suburban 1500 4x4 SOLD 69 Pontiac Lemans 99 Silverado 4.8 5 speed ECSB [ Facebook Instagram Subscribe on YOUTUBE

08-06-2002, 10:27 PM	#9
JHickson6 I Love This Stuff! Join Date: May 2002 Location: Winnipeg, Manitoba, Canada Posts: 739	I'm not sure if anyone has mentioned this yet but what about the "ground" ??? __________________ My Rides 1967 C10 In Pieces for now 1985 Ford B700 SourPuss Bus - BIG BLUE 2003 Silverado CITY WORKER YELLOW!!

08-06-2002, 10:33 PM	#10
AK70SWB Registered User Join Date: Jun 2002 Location: SPRINGFIELD MO. Posts: 126	kick a$$ so i never need to fill my truck up with gas-- this board rules!!! __________________ the sun even shines on a dogs a$$ some days!!!

08-07-2002, 02:48 PM	#12
Pumkin Truck Thats just prime! Join Date: Mar 2002 Location: TEXAS Posts: 720	THATS WHAT I'M TRYING TO FIGURE OUT TOO!!! __________________ 69 GMC short bed stepside with a wimpy six that can barely pull itself. 99 Chevrolet Camaro Z-28 1 Bad 5.7ltr LS1

08-07-2002, 02:59 PM	#13
Patrick Sullivan Transcendental Trucker Join Date: Dec 2001 Location: Rockaway Beach, OR Posts: 374	I assume we're talking about the tank behind the seat. It doesn't have a ground wire (at least mine doesn't), it grounds through the tank itself, probably through the bolts that hold the tank to the cab. I'm not exactly sure how you'd go about grounding it any better.. __________________ Patrick Sullivan \| sullivan@oregoncoast.com Rockaway Beach, Oregon 1972 Chevy Cheyenne C-20 1998 Dodge Dakota 4x4 So, fill to me the parting glass And drink a health whate'er befalls... Then gently rise and softly call Goodnight and joy be to you all!

08-07-2002, 10:19 PM	#14
MikeB Senior Member Join Date: Jul 2000 Location: North Texas Posts: 3,635	Don't forget the brass float in the tank. Mine was leaking and did weird stuff depending on the gas tank level and temperature. Turned out it had a little gas in it. You can buy the float or entire sending unit from any of the 67-72 parts vendors. __________________ Mike 1969 C10 LWB -- owned for 36 years. 350/TH350, 3.08 posi, 1st Gen Vintage Air, recent AAW wiring harness, 5-lug conversion, 1985 spindles and brakes. 1982 C10 SWB -- sold 1981 C10 Silverado LWB -- sold, but wish I still had it! 1969 C10 (not the current one) that I bought in the early 1980s. Paid $1200; sold for $1500 a few years later. Just a hint at the appreciation that was coming. Retired as a factory automation products salesman. Worked part-time over the years for an engine builder and a classic car repair shop. Member here for 24 years! This is the very first car/truck Internet forum I joined. I still used a dial-up modem back then!

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