gas gauge problem - The 1947 - Present Chevrolet & GMC Truck Message Board Network

wlf89 · 03-20-2006, 03:19 PM

i have a 69 chevy truck and im having gas gauge problems but its got gas in it if you turn the switch off the gauge will go up a little but when you crank it the gauge goes down to empty what are some of the problems it could be

truknut · 03-20-2006, 10:00 PM

Take the wire off the sender and watch the hand , when the switch is on. If it goes to full your gauge is probably bad... Something else you can try take the wire off the sender and stick a paper clip inside the wire connector and stick it to something that will ground it, if it goes back to where it was before you take the wire off, it's the gauge. I had kinda the same problem, mine was the gauge.. Plus you might need to check the wire all the way up to the fuse box.

jsbgump · 03-21-2006, 12:42 AM

Most likely the resistor on the back of the gauge

vtblazer · 03-21-2006, 07:52 AM

I just messed with the one in my blazer and I just took a wire off of the fuse block. (way easier to get to)

Open ground/bad resistor, it will go way past full.
Grounded out, it will stay down on empty.
Assuming all your connections/wiring is good.

That's what I got from mine, I had a busted resistor wire on the sending unit.

wlf89 · 03-26-2006, 11:34 AM

i replaced the wire from the fuse box to the fuel tank and that didnt help the problem it is still going past full when i take the wire off with the switch on, then when i put the wire back on it goes down to empty, then i can cut the switch off and the hand will move up a little after a while. what do you think this would be?

70c10 · 03-26-2006, 11:46 AM

Check your printed circuit on the back of the cluster for breaks.

byrd · 03-26-2006, 12:01 PM

You have a busted resistor, going way past full= infinite resistance=broken/incomplete circuit. Go to www.fix-a-gauge.com and get the fuel gauge replacement resistor and that should clear the issue up. If you have a multi meter you can check the resistor to see if it is the problem and iirc the reading should e around 68 ohms.You should also check the PCB(printed circuit board) on the back of the gauge cluster to assure you don't have a broken or burnt connection. My .02...Randy

Olden Days · 03-26-2006, 12:36 PM

Quote:

Originally Posted by wlf89

i replaced the wire from the fuse box to the fuel tank and that didnt help the problem it is still going past full when i take the wire off with the switch on, then when i put the wire back on it goes down to empty, then i can cut the switch off and the hand will move up a little after a while. what do you think this would be?

With the wire pulled OFF the sending unit it is normal for the gauge to read past full. I think there is a good chance there is nothing wrong with either your gauge or sender but instead your float has a hole in it and became full of gas, causing it to stay down at the bottom.

wlf89 · 03-26-2006, 04:12 PM

i guess my guage or resistor is bad in my other truck too because i can take the wire off and the hand goes past full.

olden days you were right, the float was cracked and full of gas.
THANKS

03-20-2006, 03:19 PM	#1
wlf89 69 c/10 lwb fleetside Join Date: Jul 2004 Location: saint joseph TN Posts: 195	gas gauge problem i have a 69 chevy truck and im having gas gauge problems but its got gas in it if you turn the switch off the gauge will go up a little but when you crank it the gauge goes down to empty what are some of the problems it could be __________________ 69 lwb fleetside 67 swb fleetside (2) 72 lwb fleetside 50 swb no bed 65 impala ss 65 1 ton flatbed

03-20-2006, 10:00 PM	#2
truknut Registered User Join Date: Oct 2005 Location: Florence, AL (NW Alabama) Posts: 309	Re: gas gauge problem Take the wire off the sender and watch the hand , when the switch is on. If it goes to full your gauge is probably bad... Something else you can try take the wire off the sender and stick a paper clip inside the wire connector and stick it to something that will ground it, if it goes back to where it was before you take the wire off, it's the gauge. I had kinda the same problem, mine was the gauge.. Plus you might need to check the wire all the way up to the fuse box.

03-21-2006, 12:42 AM	#3
jsbgump Gone Fishing Join Date: Aug 2005 Location: Fort Worth, Texas 76135 Posts: 12,361	Re: gas gauge problem Most likely the resistor on the back of the gauge __________________ 68 Chevy Short Fleetside LSX Swap Under Way 3.73 posi 2.5/4 drop Frame of resto has been started 2022 Hyundai Tucson Limited 2019 Chevy Traverse Redline Edition Wifes Ride Build Thread http://67-72chevytrucks.com/vboard/s...=1#post3483616

03-21-2006, 07:52 AM	#4
vtblazer Registered User Join Date: Oct 2003 Location: Central Vermont Posts: 8,538	Re: gas gauge problem I just messed with the one in my blazer and I just took a wire off of the fuse block. (way easier to get to) Open ground/bad resistor, it will go way past full. Grounded out, it will stay down on empty. Assuming all your connections/wiring is good. That's what I got from mine, I had a busted resistor wire on the sending unit.

03-26-2006, 11:34 AM	#5
wlf89 69 c/10 lwb fleetside Join Date: Jul 2004 Location: saint joseph TN Posts: 195	Re: gas gauge problem i replaced the wire from the fuse box to the fuel tank and that didnt help the problem it is still going past full when i take the wire off with the switch on, then when i put the wire back on it goes down to empty, then i can cut the switch off and the hand will move up a little after a while. what do you think this would be? __________________ 69 lwb fleetside 67 swb fleetside (2) 72 lwb fleetside 50 swb no bed 65 impala ss 65 1 ton flatbed

03-26-2006, 11:46 AM	#6
70c10 67-72 Addict! Join Date: Feb 2002 Location: The TAX State! Posts: 7,857	Re: gas gauge problem Check your printed circuit on the back of the cluster for breaks. __________________ Jim 1970 C/10 Fleetside w/Ghost Flames Lowered 4.5" front and 4" rear (Raked) 355/350 Turbo w/shift kit 10" Redneck Performance Verter w/2500 stall Hooker Super Comps part#2808-1 Performer RPM Air-Gap 12 Bolt w/3:73 gears- Eaton Posi Comp Cams XE262 with 1.6 Crane Energizers, Road Demon 625 and Brodix IK 180 heads

03-26-2006, 04:12 PM	#9
wlf89 69 c/10 lwb fleetside Join Date: Jul 2004 Location: saint joseph TN Posts: 195	Re: gas gauge problem i guess my guage or resistor is bad in my other truck too because i can take the wire off and the hand goes past full. olden days you were right, the float was cracked and full of gas. THANKS __________________ 69 lwb fleetside 67 swb fleetside (2) 72 lwb fleetside 50 swb no bed 65 impala ss 65 1 ton flatbed



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