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Old 08-04-2012, 09:42 AM   #1
Semper Fi
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Default Gas gauge reads backwards

I'm new to the forum and after 50+ years, again have a Model A (29 Roadster).

My gas gauge reads 0 when the tank is full and then starts backwards starting from 1/4 on up as the gas level goes down. How do I fix this?

Ernie Stewart
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Old 08-04-2012, 09:46 AM   #2
Franchise_24
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Default Re: Gas gauge reads backwards

Quote:
Originally Posted by Semper Fi View Post
I'm new to the forum and after 50+ years, again have a Model A (29 Roadster).

My gas gauge reads 0 when the tank is full and then starts backwards starting from 1/4 on up as the gas level goes down. How do I fix this?

Ernie Stewart
Ok, when it reads 1/4, 1/2, and 3/4 are the numbers upside down to read? If so the gauge is just in upside down and needs to be pulled and reinserted the correct way.

P.S.
Welcome back to the hobby and to the forums, glad to have you here.

Last edited by Franchise_24; 08-04-2012 at 09:47 AM. Reason: Addition
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Old 08-04-2012, 09:58 AM   #3
Bruce Adams
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Default Re: Gas gauge reads backwards

or just turn the car upside down??

Yes, to the gauge being upside down.
Pull it up with a coat hanger and make sure its on FULL
ALSO
Purchase and replace with a NEOPRENE "cork" float since alcohol in today's gas makes the CORK floats sink.
Neoprene floats are available from all the Model A Parts Vendors.

DO make sure you have 1/2 tank or less and that the battery is disconnected prior to the job which is pretty easy.

The book MODEL A MECHANICS HANDBOOK by Les Andrews describes each and every step to do this job.
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Old 08-04-2012, 10:02 AM   #4
Semper Fi
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Default Re: Gas gauge reads backwards

No, they read correctly and when it reads 0 I can see the bottom of the metal under the zero indicater.

And thank you for the welcome.
Ernie
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Old 08-04-2012, 10:07 AM   #5
Semper Fi
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Default Re: Gas gauge reads backwards

When I drive, the gauge moves, so do you think it is still the float? I've never let the tank drop below the 1/4 mark, so I guess I'll have to see how far down (up?) the gauge will register.

Ernie
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Old 08-04-2012, 12:03 PM   #6
Jim Brierley
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Default Re: Gas gauge reads backwards

I think you have an Australian gauge???
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Old 08-04-2012, 12:09 PM   #7
Semper Fi
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Ok, I ordered both books. Barnes and Noble was the cheapest, if you call $100 cheap. Oh well, if your gonna play, ya gotta pay!
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Old 08-04-2012, 02:03 PM   #8
Tom F OHIO
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Default Re: Gas gauge reads backwards

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Originally Posted by Semper Fi View Post
When I drive, the gauge moves, so do you think it is still the float? I've never let the tank drop below the 1/4 mark, so I guess I'll have to see how far down (up?) the gauge will register.

Ernie
If the guage is showing empty when it is full then the cork either came off or has sunk for some reason. The wire itself will show some floating on your guage. Good Luck
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Old 08-04-2012, 03:01 PM   #9
J Franklin
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Default Re: Gas gauge reads backwards

Did that gauge come from Ricks model a parts?
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Old 08-04-2012, 03:31 PM   #10
BILL WILLIAMSON
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Default Re: Gas gauge reads backwards

Could the "floatibility" of a sunken, saturated, cork float be affected by the temperature of the newly added gas??? When my cork sank after being in the hospital for 3 1/2 weeks, (Me in the "hospital," Not the car!) filling with new gas to the 1/2 tank of the OLD gas caused the guage to go up to about 1/4 tank!!! Maybe it was Ole' Bill's GHOST messin' with my "MIND."
Most "weird" stuff can eventually be explained, but some keep you awake at night for MONTHS. During one of those escapades, I discovered that my dog does WHOOPEE, smelly, quiet farts in bed under the covers. When I retaliate, he never flinches!! Bill W.
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Old 08-04-2012, 04:10 PM   #11
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Default Re: Gas gauge reads backwards

Time for a new float.
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Old 08-04-2012, 04:52 PM   #12
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Default Re: Gas gauge reads backwards

Quote:
Originally Posted by Semper Fi View Post
I'm new to the forum and after 50+ years, again have a Model A (29 Roadster).

My gas gauge reads 0 when the tank is full and then starts backwards starting from 1/4 on up as the gas level goes down. How do I fix this?

Ernie Stewart

If it's a bad float why is it going up as the gas level is going down. Sounds like it reads
empty when the tank is full and full when the tank is empty.

Bob
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Old 08-04-2012, 06:28 PM   #13
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Default Re: Gas gauge reads backwards

Oh this is going to be good. I can't wait to hear the answer.
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Old 08-04-2012, 06:33 PM   #14
CarlG
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Default Re: Gas gauge reads backwards

It should be dead on when it reads 1/2 then
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Old 08-04-2012, 07:16 PM   #15
Herb Concord Ca
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Default Re: Gas gauge reads backwards

Have you tried to hook the wire and put it up as far as you can and see what the gauge reads? If the gauge is installed correctly it should show the full mark. If it does, take the gauge out and replace the float.
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Old 08-04-2012, 11:14 PM   #16
J Franklin
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Default Re: Gas gauge reads backwards

That's what I said, replace the float!
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Old 08-05-2012, 12:45 AM   #17
Chuck Sea/Tac
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Default Re: Gas gauge reads backwards

I had the same problem, the float would go up and down when gas was added, or just for no reason. New neoprene float solved the problem. Chuck
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Old 08-05-2012, 11:53 AM   #18
Semper Fi
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Default Re: Gas gauge reads backwards

Yep, you were right..... the float is laying on the bottom. It must have been bouncing a little as the gas was starting to slosh around and that's why the 1/4 would start to show. I ordered a new float today.

Thanks to everyone for their help!

Ernie
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Old 08-05-2012, 03:55 PM   #19
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Default Re: Gas gauge reads backwards

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Originally Posted by Semper Fi View Post
Yep, you were right..... the float is laying on the bottom. It must have been bouncing a little as the gas was starting to slosh around and that's why the 1/4 would start to show. I ordered a new float today.

Thanks to everyone for their help!

Ernie
Heh-heh-heh. Thanks for letting us know.
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