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02-07-2007, 11:12 PM
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#1 |
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Registered User
Join Date: Nov 2006
Location: Houston Texas
Posts: 4
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Gas Gauge Trouble
I need some advice. Since I bought my '72 the gas gauge has not worked; so I just replaced the sending unit. But the gauge still doesn't read and if you unplug the wire on top of the sending unit (key on) the gauge then goes to full. As soon as I plug it back the gauge goes to empty again. What could be the problem???
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02-07-2007, 11:16 PM
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#2 |
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Account Suspended
Join Date: Mar 2003
Location: ** THE FALL GUY **CHICAGO IL
Posts: 5,883
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Re: Gas Gauge Trouble
welcome to the board
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02-07-2007, 11:27 PM
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#3 | |||
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Union Electrician
Join Date: Feb 2005
Location: Louisville, Ky.
Posts: 3,354
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Re: Gas Gauge Trouble
You probably have a short in the wire between the sending unit and the gauge. You should check for frayed wires or a splice somewhere along the wire. Yu can also just check continuity on the wire if you have a multi meter and BTW Wlecome to the board from KY !!
__________________
 69 Custom-10 SWB FLEETSIDE 350/350 TH Dropped 3.5/5.5"Help support the board->HERE Board vendors -> Vendors list Zip:40272 Big Sandy Survivor... Quote:
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02-07-2007, 11:33 PM
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#4 |
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Registered User
Join Date: Nov 2006
Location: Houston Texas
Posts: 4
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Re: Gas Gauge Trouble
Thanks for the welcome. The info on this site has been great! I will try checking the wires as you recomended. Thanks!
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02-07-2007, 11:41 PM
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#5 |
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Account Suspended
Join Date: Dec 2005
Posts: 114
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Re: Gas Gauge Trouble
sounds like my truck field mice made a home out of my truck chewing through random wires. I got all the lights working then quit. if i'm not sure how much gas is in it i just wip out my trusty old dipstick. good luck finding that short
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02-08-2007, 05:57 AM
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#6 |
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Senior Member
 
Join Date: Feb 2002
Location: Tucson, AZ USA
Posts: 7,504
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Re: Gas Gauge Trouble
I keep a log book. I figure it gets 10 miles per gallon on a 20 gallon tank. That gives me a range of 200 miles. I make sure I fill it again before 200 miles is up.
If it's not the wire, and the sender is new [and assumed to be good] the float could be bad. Leaky, defective or fell off during or after install. Sounds like the gauge is good if it reads (beyond) full when you unplug it.
__________________
Every 25 years I like to rebuild that 292, whether it needs it or not. Last edited by '68OrangeSunshine; 02-08-2007 at 06:03 AM. |
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02-09-2007, 09:45 PM
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#7 | |
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Registered User
Join Date: Dec 2006
Location: Rhode Island
Posts: 602
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Re: Gas Gauge Trouble
Quote:
Assuming the tank isn't empty (you're sure of this, aren't you?), I think the problem is one of 3 things: Electrical post on sending unit shorted to ground Float is sunk or stuck in the down position variable resister inside the sending unit is bad. Either way, you'll need to pull the sending unit and head for the bench. Make sure the float is empty. Then using an ohmmeter, see if the resistance changes as you move the float arm. Check the specs to see what it should read. (0-600 Ohms I think, but don't quote me). Maybe one of our experts with a tech manual can verify.  My guess is the float is sunk, or something's wrong with the sending unit. Good luck and let us know what you find. And be careful with that open gas tank. We'd hate to loose a good truck from our collection.
__________________
69 C-10 SWB Fleetside 454/TH400 (For Sale) http://67-72chevytrucks.com/vboard/c...ct=1299&cat=12 70 El Camino 454 TH700 29 Model A 4-DR Sedan Deluxe |
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02-09-2007, 09:55 PM
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#8 |
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Registered User
Join Date: Apr 2006
Location: edmonton ab ca
Posts: 88
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Re: Gas Gauge Trouble
any one know what the Ohms should be. i hear it should be 0-90 Ohms.
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02-09-2007, 11:46 PM
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#9 |
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Senior Member
Join Date: Aug 2004
Location: Centennial, CO
Posts: 2,990
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Re: Gas Gauge Trouble
Yup, 0-90 ohms.
I've seen a new sender read zero, the electrical connector pin wasn't centered in its rubber insulating grommet and was touching the body of the sender (short to ground). It's worth checking.
__________________
ClusterTruck: 68 C10 Bought in 89, wrecked in 03. Slow low $ rebuild started '17. 6.0 & TKO http://67-72chevytrucks.com/vboard/s...d.php?t=788602 93 K1500 Short Step, 350, NV4500, EBL flash ECU. Vortec heads & roller cam someday... 05 Jeep Wrangler Unlimited. 3” lift & 6-speed 02 E320 the insurance total “free car” 13 Tahoe LTZ |
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02-12-2007, 09:30 PM
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#10 | |
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Registered User
Join Date: Dec 2006
Location: Rhode Island
Posts: 602
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Re: Gas Gauge Trouble
Quote:
 Good luck.
__________________
69 C-10 SWB Fleetside 454/TH400 (For Sale) http://67-72chevytrucks.com/vboard/c...ct=1299&cat=12 70 El Camino 454 TH700 29 Model A 4-DR Sedan Deluxe Last edited by mnunn454; 02-12-2007 at 09:31 PM. |
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02-12-2007, 09:49 PM
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#11 |
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Who's got steelies?
Join Date: Feb 2006
Location: Morrison, Oklahoma
Posts: 1,025
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Re: Gas Gauge Trouble
I've had trouble with some repro floats being too heavy to float. Might be the problem if whole unit is a repro.
__________________
 1969 C10 LWB W/ 250 I6 & 3spd1970 C10 with '67 small window cab, 68 front end, blue; 305/TH350, 3.08 limited slip rear end, manual brakes, power steering; & 4-wheel drums-My daily driver.1975 Chevelle Malibu Classic Coupe 350/th350 mint green1970 C20 Suburban 350/700R4 4.10 gearing green & white 1978 Big 10 Silverado 350/th350, working ac, 2 tone blue-My summer daily driver 1983 GMC 1500 Sierra 305/SM465 2.73 rear end How to add a trip odometer to your 67-72 stock speedometer How to rebuild your Q-Jet My Truck Page My Youtube Channel |
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02-12-2007, 10:12 PM
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#12 |
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Msgt USAF Ret
 
Join Date: Jan 2005
Location: Kalamazoo, Michigan
Posts: 8,718
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Re: Gas Gauge Trouble
__________________
VetteVet metallic green 67 stepside 74 corvette convertible 1965 Harley sportster 1995 Harley wide glide Growing old is hell, but it beats the alternative. |
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