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floyd4587

Posted 2009-03-05 11:55 PM (#165892)
Subject: Fuel Sending Unit O-Ring

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Location: Boise, ID

I just took my gas tank to get cleaned out. It turned out to be in good shape, even the fuel sending unit. The only problem is the last person who replaced the fuel sender sealed it up with silicone which the gas ate away. Does anyone know where I can get the correct O-ring for this, or something else that would serve the same purpose? Thanks, Brendan.

crvsir

Posted 2009-03-06 6:20 AM (#165915 - in reply to #165892)
Subject: Re: Fuel Sending Unit O-Ring

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Location: Canada

Try Vintage Valley Auto Parts, 1-440-355-4085, He sells repro sending units but I think he'll sell the gasket alone....

dukeboy

Posted 2009-03-06 8:00 AM (#165920 - in reply to #165915)
Subject: Re: Fuel Sending Unit O-Ring

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That "O" ring should be like any O-ring at the local NAPA auto parts store..You will have to look and take your filler neck with you for the correct size, but should be available

crvsir

Posted 2009-03-06 8:44 AM (#165925 - in reply to #165892)
Subject: Re: Fuel Sending Unit O-Ring

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Location: Canada

The sending unit, not the filler neck has a o ring type gasket with square edges, it fits in a grove on the tank before you lock the sending unit in place.....

matte

Posted 2016-11-28 4:46 PM (#527405 - in reply to #165892)
Subject: Re: Fuel Sending Unit O-Ring

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Pulling up this old thread. Has anyone fitted a new sender seal in a 58 Plymouth or maybe other 57-59 FL. I noticed when I took my sender out someone had used an o-ring that was cut to size. When I went on the net to find a new one I noticed that there were 2 different ones for the same model cars.
Postage for any of the fitting sender seals from the US to Aus was $15 - $40 which is ridiculous. If I can use a correct size o-ring or even cut some flat rubber, that would be more viable. Can I just use an ordinary round sided o-ring? If so does it have to be the thick style?

56D500boy

Posted 2016-11-28 8:20 PM (#527434 - in reply to #527405)
Subject: Re: Fuel Sending Unit O-Ring

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I recently (Sept) had my 56 Dodge CR fuel tank restored and chemically lined. As a result, the fuel sender was removed - which gave me a chance to fix the cork floats. I bought a new "O"-ring to re-install the sender but when I did so, I didn't like the fit. So I reused the original square cross-section rubber "O" ring, adding a very small amount of a blue RTV silcone sealant that is supposedly compatible with fuel. So far to good.

matte

Posted 2016-11-28 10:31 PM (#527447 - in reply to #527434)
Subject: Re: Fuel Sending Unit O-Ring

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56D500boy - 2016-11-28 8:20 PM

I recently (Sept) had my 56 Dodge CR fuel tank restored and chemically lined. As a result, the fuel sender was removed - which gave me a chance to fix the cork floats. I bought a new "O"-ring to re-install the sender but when I did so, I didn't like the fit. So I reused the original square cross-section rubber "O" ring, adding a very small amount of a blue RTV silcone sealant that is supposedly compatible with fuel. So far to good.

:)

You don't know the size of the o-ring you used? How thick were the walls on square walled one?

Mopar1

Posted 2016-11-29 10:26 AM (#527468 - in reply to #527447)
Subject: Re: Fuel Sending Unit O-Ring

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Location: N.W. Fla.

My understanding is most of the O Rings are half the thickness of the original.

57chizler

Posted 2016-11-29 6:27 PM (#527494 - in reply to #527468)
Subject: Re: Fuel Sending Unit O-Ring

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You'll rarely find an O ring with the correct dimensions to replace an original lathe-cut rubber gasket. If you can find the ID, the OD and the thickness dimensions of the original gasket it might be a common part.

56D500boy

Posted 2016-11-29 6:50 PM (#527495 - in reply to #527447)
Subject: Re: Fuel Sending Unit O-Ring

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matte - 2016-11-28 10:31 PM

56D500boy - 2016-11-28 8:20 PM
I recently (Sept) had my 56 Dodge CR fuel tank restored and chemically lined. As a result, the fuel sender was removed - which gave me a chance to fix the cork floats. I bought a new "O"-ring to re-install the sender but when I did so, I didn't like the fit. So I reused the original square cross-section rubber "O" ring, adding a very small amount of a blue RTV silcone sealant that is supposedly compatible with fuel. So far to good.
:)

You don't know the size of the o-ring you used? How thick were the walls on square walled one?

Sorry if I wasn't clear. My point was I did NOT use an O-ring in the end. The closest I could find was not close enough so I just re-used the original square cross-section ring with a smear of blue RTV on both sides. Worked. YMMV

matte

Posted 2016-11-29 11:45 PM (#527516 - in reply to #165892)
Subject: Re: Fuel Sending Unit O-Ring

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Posts: 977
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Location: Sydney, Australia

My problem is that someone has used a cut o-ring to do the job but it doesn't seal 100%. The only thing I can do is to use verniers and try to get a measurement by the groove..

Sorry I meant any measurements of your old seal but I might try a couple of different things.

Edited by matte 2016-11-29 11:48 PM

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