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Fuel Gauge Again
#1182481 Tue Sep 13 2016 11:25 PM
Joined: May 2015
Posts: 40
G
Wrench Fetcher
The fuel gauge on my 54 Chev 3100 is acting up again. The gauge needle tracks great when I raise the sending unit arm, but only to about 1/3 full. No matter how high I move the sender arm the needle stays at 1/3 full. When I bring the arm back down it tracks great again from 1/3 to empty. The gauge is the original 6 volt gauge with a Runtz voltage reducer.
I also have a new 30 Ohm sending unit that I bench tested with a multi-meter and it tracks 0-30 Ohms when moving the arm from the empty position to the full position.
I jumped the sending unit post to the sending unit cab ground wire and the gauge needle pegged to empty. I removed the sending unit wire to the gauge and the needle only pegs to 1/2 full. My understanding is that it should peg to full. I'm thinking the gauge is shot or in need of calibration but could I still be having a ground issue? Any suggestions are much appreciated.

Re: Fuel Gauge Again
GRNHydra #1182487 Tue Sep 13 2016 11:37 PM
Joined: Sep 2001
Posts: 30,126
ace skiver
Might as well ask to be sure: 12v electrical system (necessitating the Runtz reducer)?


Tim
1954Advance-Design.com [1954advance-design.com]
1954 3106 Carryall Suburban [stovebolt.com] - part of the family for 49 years
1954 3104 5-window pickup w/Hydra-Matic [1954advance-design.com] - part of the family for 15 years
- If you have to stomp on your foot-pedal starter, either you, or your starter, or your engine, has a problem.
- The 216 and early 235 engines are not "splash oilers" - this is a splash oiler. [chevy.oldcarmanualproject.com]
Re: Fuel Gauge Again
GRNHydra #1182490 Tue Sep 13 2016 11:46 PM
Joined: May 2015
Posts: 40
G
Wrench Fetcher
Yes, it was converted to 12 volt by the previous owner. The gauge was not working and had no reducer. I pulled the gauge out and a small wire on the back was fried. It was repaired and I was told calibrated. I installed it with a reducer and it seems to now have a life of its own.

Re: Fuel Gauge Again
GRNHydra #1182493 Tue Sep 13 2016 11:59 PM
Joined: May 2005
Posts: 1,635
B
Shop Shark
Now I have to ask....when repaired and calibrated , did the shop convert it to 12 volt internally?


Six volt guy living in a twelve volt world
Re: Fuel Gauge Again
GRNHydra #1182498 Wed Sep 14 2016 12:37 AM
Joined: May 2015
Posts: 40
G
Wrench Fetcher
Good question, I'll have to check.

Re: Fuel Gauge Again
GRNHydra #1182594 Wed Sep 14 2016 04:09 PM
Joined: May 2015
Posts: 40
G
Wrench Fetcher
Before I remove the gauge cluster and fuel gauge would it be to risky to remove the voltage reducer and try the gauge through the 12 volt system? I've read forum entries where a reducer was never used, once converted to 12 volt, and the 6 volt gauge worked fine.

Re: Fuel Gauge Again
GRNHydra #1182601 Wed Sep 14 2016 04:49 PM
Joined: Dec 2006
Posts: 1,154
W
Shop Shark
Check with Fifth Avenue Garage, Randy Rundel has a whole page on fuel gauges and 6-12volt gauges great stuff.

Re: Fuel Gauge Again
GRNHydra #1182626 Wed Sep 14 2016 08:01 PM
Joined: May 2005
Posts: 1,635
B
Shop Shark
First of all, some guys get away with the conversion without the reducer, some don't. Sounds like your trucks PO didn't. OK if you want to try it again, 'it's only money'.
Disconnect the battery if your working under the dash. Question, what kind of reducer do you have?


Six volt guy living in a twelve volt world
Re: Fuel Gauge Again
GRNHydra #1182631 Wed Sep 14 2016 09:30 PM
Joined: May 2015
Posts: 40
G
Wrench Fetcher
Just got back from the speedometer shop and had the fuel gauge checked out. Turns out the gauge is working great at 6 volts but to jumpy/sensitive when tested at 12 volts. I brought along the Runtz reducer I had on the gauge and it tested bad. I had a second Runtz I brought along, that I already thought was bad, and it also tested bad. Now I'm on the hunt for a good reliable reducer. One suggestion by the shop is to use a 1973 Dodge van instrument cluster reducer from Napa, about 40-50 bucks. They were not to keen on the Runtz reducers and neither am I at this point. Said Runtz have a bad track record.

Re: Fuel Gauge Again
GRNHydra #1182632 Wed Sep 14 2016 09:33 PM
Joined: Sep 2001
Posts: 30,126
ace skiver
Where did you buy your Runtz reducer?

The ones I have bought from Classic Parts have worked.


Tim
1954Advance-Design.com [1954advance-design.com]
1954 3106 Carryall Suburban [stovebolt.com] - part of the family for 49 years
1954 3104 5-window pickup w/Hydra-Matic [1954advance-design.com] - part of the family for 15 years
- If you have to stomp on your foot-pedal starter, either you, or your starter, or your engine, has a problem.
- The 216 and early 235 engines are not "splash oilers" - this is a splash oiler. [chevy.oldcarmanualproject.com]
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