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Anyone have trouble with leaking sending unit gasket?
#1299629
09/08/12 06:03 AM
09/08/12 06:03 AM
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Joined: Jan 2003
Posts: 5,449
Woodbridge,CA
NAS Backyard
OP
master
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OP
master
Joined: Jan 2003
Posts: 5,449
Woodbridge,CA
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I have.. Several times. Just installed a new tank, sending unit and gasket. I thought is was leaking out of the vent. but it just kept getting worse. I was hoping the problem would go away with all the new $#!+ I threw at it...NOT! I could actually wiggle the sending unit as installed.Tank is a Spectra. I think the flange material is thinner , but my old tank is an original and it's all tweeked out too. I ended up taking the gasket I made for my old sending unit and installing it and so far, so good. It's made from sandwiching cork between paper and it's a bit thicker than the rubber pos. Man I hope it doesn't leak again. If it does I'll make a thicker gasket.
Well I went and checked it before posting, I did fill it up and it is dry at the gasket but it leaked out the vent pipe a little. So I cracked the cap and it had a little pressure in it. here we go again??????
1970 Challenger Ragtop 426 4 speed
1961 Olds 88 2 dr Sedan 394 4 speed GVOD
1968 Pontiac Firebird 428 4 speed
2000 Ford F-150
2002 HD Roadking
1961 Licence Plate collection
1995 Buick Roadmaster
www.nogreenautolaws.com
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Re: Anyone have trouble with leaking sending unit gasket?
[Re: NAS Backyard]
#1299630
09/08/12 08:32 AM
09/08/12 08:32 AM
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Joined: May 2005
Posts: 6,446
NJ-USA
HPMike
master
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master
Joined: May 2005
Posts: 6,446
NJ-USA
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Quote:
I have.. Several times. Just installed a new tank, sending unit and gasket. I thought is was leaking out of the vent. but it just kept getting worse. I was hoping the problem would go away with all the new $#!+ I threw at it...NOT! I could actually wiggle the sending unit as installed.Tank is a Spectra. I think the flange material is thinner , but my old tank is an original and it's all tweeked out too. I ended up taking the gasket I made for my old sending unit and installing it and so far, so good. It's made from sandwiching cork between paper and it's a bit thicker than the rubber pos. Man I hope it doesn't leak again. If it does I'll make a thicker gasket.
Well I went and checked it before posting, I did fill it up and it is dry at the gasket but it leaked out the vent pipe a little. So I cracked the cap and it had a little pressure in it. here we go again??????
its a common problem with the repop tanks/sending units.. Doubling up the rubber gasket always worked for me. I would be concerned that your paper/cork gasket will fail when exposed to the gas in the tank.. 
MB
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Re: Anyone have trouble with leaking sending unit gasket?
[Re: dart1962_440]
#1299632
09/08/12 08:48 AM
09/08/12 08:48 AM
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Joined: Mar 2010
Posts: 1,880
Out in Left Field, NY
bobs66440
top fuel
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top fuel
Joined: Mar 2010
Posts: 1,880
Out in Left Field, NY
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Quote:
I had the same issue before and found that using the original lock ring prevented a leaking sending unit
 The new rings aren't as good.
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Re: Anyone have trouble with leaking sending unit gasket?
[Re: NAS Backyard]
#1299633
09/08/12 02:45 PM
09/08/12 02:45 PM
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Joined: Jan 2003
Posts: 5,449
Woodbridge,CA
NAS Backyard
OP
master
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OP
master
Joined: Jan 2003
Posts: 5,449
Woodbridge,CA
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Thanks, I am using the original lock ring now and it wasn't leaking this morning when I got up. It went on really tight. I was still a little concerned about how much it was suppose to vent out. That's an odd design. The new rubber gasket I removed last night was really flimsy and wasn't what you would expect from a gasket like that, that's why I went back to the gasket material.
1970 Challenger Ragtop 426 4 speed
1961 Olds 88 2 dr Sedan 394 4 speed GVOD
1968 Pontiac Firebird 428 4 speed
2000 Ford F-150
2002 HD Roadking
1961 Licence Plate collection
1995 Buick Roadmaster
www.nogreenautolaws.com
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Re: Anyone have trouble with leaking sending unit gasket?
[Re: bobs66440]
#1299634
09/08/12 09:33 PM
09/08/12 09:33 PM
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Joined: Nov 2004
Posts: 7,274
s.w.fl
bonefish
master
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master
Joined: Nov 2004
Posts: 7,274
s.w.fl
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Quote:
Quote:
I had the same issue before and found that using the original lock ring prevented a leaking sending unit
The new rings aren't as good.
same here
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