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Gas Gauge - 1949 Suburban
#793944 Mon Oct 31 2011 03:07 PM
Joined: May 2007
Posts: 321
P
Shop Shark
I have a 49 suburban with a new 0-30 ohm sender in the tank hooked up to the factory gauges. I'm not sure if the gas gauge in the cluster is 6V or 12V (or if that matters). When I turn on my key, the fuel gauge goes right over to F and a little beyond. The gas tank is near empty. Any help with some troubleshooting tips would be appreciated. My truck has been converted to 12V

Last edited by pplummer; Mon Oct 31 2011 03:08 PM.
Re: Gas Gauge - 1949 Suburban
pplummer #793951 Mon Oct 31 2011 03:38 PM
Joined: Jan 2002
Posts: 2,088
C
Shop Shark
Maybe the sending unit wire is accidently grounded somewhere?


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If I'm not working on my truck or VW camper, I'm fishing with the wife or smoking Salmon.
Re: Gas Gauge - 1949 Suburban
pplummer #793952 Mon Oct 31 2011 03:39 PM
Joined: Jun 2008
Posts: 1,455
M
Shop Shark
I think that means the float is stuck, or the resistance, ain't resistancing. By that I mean that perhaps the wire has come off the sender, or you've lost your ground. If I recall correctly, the higher the level in the tank, the more resistance in the circuit, That why I'd imagine the resistance ain't resistancing.

Have you pulled the tank from the truck?


Christopher

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Re: Gas Gauge - 1949 Suburban
pplummer #793953 Mon Oct 31 2011 03:48 PM
Joined: Jan 2000
Posts: 124
F
Shop Shark
If your truck is 12-volts and your dash gauge is the stock one... you need to install a "Runtz" on the back of the fuel gauge to reduce it back down to 6-volts. Your 0-30 ohm sender is correct so you should live happily ever after.....

Re: Gas Gauge - 1949 Suburban
Mr. Lang #793957 Mon Oct 31 2011 03:57 PM
Joined: May 2007
Posts: 321
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Shop Shark
Where does the sender ground? Is it through the mounting screws itself to the tank? I guess I could jump it to find that out first right? If that doesn't work, then I guess I'll drop the tank. For clarification, When it's all the way to 'F' does that mean no resistance or full resistance? (I guess if I knew that, i'd have my answer about ground)

Re: Gas Gauge - 1949 Suburban
pplummer #793969 Mon Oct 31 2011 04:21 PM
Joined: May 2007
Posts: 321
P
Shop Shark
I'm pretty sure my gauge is 12V. Maybe the wires are reversed on the back of my gauge?

Re: Gas Gauge - 1949 Suburban
pplummer #793976 Mon Oct 31 2011 04:50 PM
Joined: Jun 2008
Posts: 1,455
M
Shop Shark
My understanding is Full = no resistance.


Christopher

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Re: Gas Gauge - 1949 Suburban
pplummer #793978 Mon Oct 31 2011 04:52 PM
Joined: Oct 2010
Posts: 1,257
L
Shop Shark
That happened to the aftermarket 12v gas gauge on my '54 (converted from 6v to 12v). I had overtightened the contact to the wire on the sending unit. Must have collapsed the insulation and grounded it out. Backed off the nut a little and solved the problem.


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Re: Gas Gauge - 1949 Suburban
LonnieC #793986 Mon Oct 31 2011 05:11 PM
Joined: May 2007
Posts: 321
P
Shop Shark
I'll check the sending unit wire for tightness, and I'll check for a bad ground. Thanks for the super quick responses!

Re: Gas Gauge - 1949 Suburban
pplummer #794272 Tue Nov 01 2011 05:47 PM
Joined: Aug 2011
Posts: 847
K
Shop Shark
I had this happen on my '51 suburban and I went about 5 years worrying about running out of gas before I finally dug into it.

I had the instrument cluster out as part of a rewire. I inspected the gas gauge and found that the fibre board backing up the contacts had warped and was grounding the gauge. I was able to straighten and reinforce this plate, and the gauge has worked just fine for the past 10 years.

Hey we still need to get together.

Kurt -Burb owner in Raleigh of long standing-


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