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Gas tank lock ring does not seal #661368 04/05/10 03:20 AM 04/05/10 03:20 AM
Joined: Mar 2003 Posts: 1,216 Fresno, CA C cudamank OP pro stock
cudamank OP pro stock C Joined: Mar 2003 Posts: 1,216 Fresno, CA	I replace the stock 5/16" sending unit on my 70' cuda with a aftermarket 3/8's with the additional 5/16th port for a return line. I used the new lock ring and gasket that came with the sending unit, but now the tank will not seal properly. I wanted to put the stock lock ring back on but of course when I check the box with the old pickup the lock ring is missing. Has anyone else had problems with this? Could the rubber gasket be too thin? Would love to more than 6 gallons of gas in the tank at a time. Remember remember the 11th of September, of murder and a terriosts plot. I see no reason why this treachery should ever be forgot.

Re: Gas tank lock ring does not seal [Re: cudamank] #661369 04/05/10 08:54 AM 04/05/10 08:54 AM
Joined: Nov 2003 Posts: 36,040 Lincoln Nebraska R RapidRobert Circle Track
RapidRobert Circle Track R Joined: Nov 2003 Posts: 36,040 Lincoln Nebraska	I would locate another oe lock ring and use a gasket the same thickness as the oe one (reuse your old one if it's OK & most are). The oe lock ring will still have plenty of tension as you tap it around and w no sealer used on that gasket reusing it is no problem, just wipe it off and make sure the tank surface in there is clean. live every 24 hour block of time like it's your last day on earth

Re: Gas tank lock ring does not seal [Re: RapidRobert] #661370 04/05/10 08:56 AM 04/05/10 08:56 AM
Joined: Feb 2003 Posts: 4,503 NJ 4 440challenger master
440challenger master 4 Joined: Feb 2003 Posts: 4,503 NJ	One time, i dont know what i was thinking but put the rubber gasket ontop of the sending unit. Dont know if it could be that simple for you to just have it backwards

Re: Gas tank lock ring does not seal [Re: cudamank] #661371 04/05/10 09:55 AM 04/05/10 09:55 AM
Joined: Apr 2003 Posts: 12,234 Looking for a way out of Middl... IMGTX I Live Here
IMGTX I Live Here Joined: Apr 2003 Posts: 12,234 Looking for a way out of Middl...	Yes many of the new replacement gaskets are too thin. If it still leaks after getting the correct thickness gasket you can tweak the lock ring to add more tension.

Re: Gas tank lock ring does not seal [Re: IMGTX] #661372 04/05/10 11:02 AM 04/05/10 11:02 AM
Joined: Feb 2003 Posts: 8,671 A Andrewh master
Andrewh master A Joined: Feb 2003 Posts: 8,671	had the same problem, had to go back with the old gasket and old lock ring. The new parts were crap. Both the ring and gasket were way thinner than the old one.

Re: Gas tank lock ring does not seal [Re: Andrewh] #661373 04/05/10 11:35 AM 04/05/10 11:35 AM
Joined: Aug 2007 Posts: 6,095 Valencia, España NachoRT74 master
NachoRT74 master Joined: Aug 2007 Posts: 6,095 Valencia, España	new O rings and also new tabs on gas tank for the locking ring are TOO WEAK, and the bend easily at the loking pressure ( BTDT on tank and new sender unit ). use the original lock ring, or over bend the new lock ring tabs With a Charger born in Chrysler assembly plant in Valencia, Venezuela

Re: Gas tank lock ring does not seal [Re: NachoRT74] #661374 04/05/10 06:20 PM 04/05/10 06:20 PM
Joined: Feb 2004 Posts: 7,196 Harrisburg, Pa. screamindriver master
screamindriver master Joined: Feb 2004 Posts: 7,196 Harrisburg, Pa.	Another problem I've run into on the cheaper lock rings are not only the thinner gauge as stated but also a lack of the positive locking feature that the original rings have...Some repops only have the ramp-up to the end without the stop/notch to keep the ring in place...I've had one back off and spill fuel !!! Luckily the exhaust was far enough away on that car... Quanta has the better lock rings and seal if you need new parts...

Re: Gas tank lock ring does not seal [Re: screamindriver] #661375 04/05/10 06:51 PM 04/05/10 06:51 PM
Joined: Mar 2005 Posts: 1,630 North Central Florida E eightlitermopar top fuel
eightlitermopar top fuel E Joined: Mar 2005 Posts: 1,630 North Central Florida	I'm dealing with the same issue currently. I have doubled up on the gaskets. The inner lip of my tank is a little warped, so I will most likely put some sealer, rings, then the sending unit to clear it up. I wish I never would have taken the original out! Also, now when the tank is full, it never reads "full" for some reason, only 3/4 at best with the "new" sending unit. I have heard this is a common problem too. anyway, double up and see what happens. eight Mopar or no car

Re: Gas tank lock ring does not seal [Re: eightlitermopar] #661376 04/05/10 07:22 PM 04/05/10 07:22 PM
Joined: Nov 2007 Posts: 21,822 Kirkland, Washington Pacnorthcuda Too Many Posts
Pacnorthcuda Too Many Posts Joined: Nov 2007 Posts: 21,822 Kirkland, Washington	Quote: I'm dealing with the same issue currently. I have doubled up on the gaskets. The inner lip of my tank is a little warped, so I will most likely put some sealer, rings, then the sending unit to clear it up. I wish I never would have taken the original out! Also, now when the tank is full, it never reads "full" for some reason, only 3/4 at best with the "new" sending unit. I have heard this is a common problem too. anyway, double up and see what happens. eight ...and just what 'sealer' do you intend to use?

Re: Gas tank lock ring does not seal [Re: Pacnorthcuda] #661377 04/05/10 07:33 PM 04/05/10 07:33 PM
Joined: Mar 2005 Posts: 1,630 North Central Florida E eightlitermopar top fuel
eightlitermopar top fuel E Joined: Mar 2005 Posts: 1,630 North Central Florida	Quote: Quote: I'm dealing with the same issue currently. I have doubled up on the gaskets. The inner lip of my tank is a little warped, so I will most likely put some sealer, rings, then the sending unit to clear it up. I wish I never would have taken the original out! Also, now when the tank is full, it never reads "full" for some reason, only 3/4 at best with the "new" sending unit. I have heard this is a common problem too. anyway, double up and see what happens. eight ...and just what 'sealer' do you intend to use? https://board.moparts.org/ubbthreads/show...e=0#Post5908086 There is a small part of the inner lip that is warped, a small amount of liquid metal to fill in the warped area (approx 1/4 of an inch of the lip), then go from there. I have the tank out now. Nothing else I have done seems to seal it up. It's either this or drive around 1/4 of a tank at a time....or a new tank. I've replaced several of these and this is the first issue I have had, so I really don't know what to do either. eight Mopar or no car

Re: Gas tank lock ring does not seal [Re: cudamank] #661378 04/05/10 08:36 PM 04/05/10 08:36 PM
Joined: Nov 2003 Posts: 2,715 closer to Canadian beer! torkrules I'm neurotic
torkrules I'm neurotic Joined: Nov 2003 Posts: 2,715 closer to Canadian beer!	Quote: I replace the stock 5/16" sending unit on my 70' cuda with a aftermarket 3/8's with the additional 5/16th port for a return line. I used the new lock ring and gasket that came with the sending unit, but now the tank will not seal properly. I wanted to put the stock lock ring back on but of course when I check the box with the old pickup the lock ring is missing. Has anyone else had problems with this? Could the rubber gasket be too thin? Would love to more than 6 gallons of gas in the tank at a time. Watch out for the cheapo Chinese lock ring and gasket. Mine leaked like a stuck pig until a bought an OEM gasket and ring from the dealer.

Re: Gas tank lock ring does not seal [Re: torkrules] #661379 04/05/10 09:08 PM 04/05/10 09:08 PM
Joined: Nov 2003 Posts: 36,040 Lincoln Nebraska R RapidRobert Circle Track
RapidRobert Circle Track R Joined: Nov 2003 Posts: 36,040 Lincoln Nebraska	Any idea if this is a good one or not. the flat is .050" thick and the O ring is .075". $10 dollars to your door 5909644-tankseal.jpg (58 downloads) live every 24 hour block of time like it's your last day on earth

Re: Gas tank lock ring does not seal [Re: RapidRobert] #661380 04/06/10 12:14 AM 04/06/10 12:14 AM
Joined: Jun 2004 Posts: 3,319 Chicago Burbs sthemi master
sthemi master Joined: Jun 2004 Posts: 3,319 Chicago Burbs	I also had a repop tank on my 66 Charger and had to use two gaskets to get it to seal. On my Roadrunner, the repop ring was way too thick for a factory tank, and would not lock, I would up using a factory lock ring.. There are all kinds of variations out there.. Video Little Red Wagon Indy Nats,BurnoutContest

Re: Gas tank lock ring does not seal [Re: RapidRobert] #661381 04/06/10 06:56 AM 04/06/10 06:56 AM
Joined: Nov 2003 Posts: 2,715 closer to Canadian beer! torkrules I'm neurotic
torkrules I'm neurotic Joined: Nov 2003 Posts: 2,715 closer to Canadian beer!	Quote: Any idea if this is a good one or not. the flat is .050" thick and the O ring is .075". $10 dollars to your door Hard to tell from pictures. Mine was too small in diameter and too thin. I have the actual tool and could see the ring moving up-down-sideways when trying to lock it. The OEM one fits with no movement and you can tell when it locks.

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