Mopar Muscle Association UK

Just got a brand new tank and sender unit....
The "O" gasket doesn't seem to be thick enough to seal the sender into the tank - therefore much seeping/dripping fuel.

I've had this on and off 3 times now... seems good when it's off and checks out ok. When I fit it back and drop £30 of fuel in, it leaks from the seal.

What am I doing wrong here?? Can anyone give me some advice??

Cheers!

If its just the thicknes thats the issue I would go to an industrial seal firm and get a thicker one. They are all over the place and will have something. What you have should work though.......

Secondly, are you putting the seal on first, then the sender unit and then the locking ring??? The locking ring should compress the sender onto the rubber seal....are you putting the locking ring in the right way round??

Cheers Steve

Cheers Steve.
Yes I am putting on gasket first... (Photo suggests otherwise I know !!)

Gotcha....I think the ring goes on the other way round as well, ie flipped over from how it is in the pic

If all else fails, you could always give the tabs on the tank a gentle tap just to force the locking ring to compress the rubber seal a bit more. If its all on the correct way then It can only be the fact that the rubber seal is too thin compared to the original one or the tabs on the locking ring are distorted (they look fine in the pics)...cant think what else it could be

Have you still got the lock ring from your old tank ? It may be a better fit if its an original part.

Yep definitely putting it in right....
Just noticed that the two tab cutouts on the tank have distorted the aperture, which is giving a bad seal.
I'll also knock the locking tabs down a bit and see if it provides a better seal.

Cheers for the ideas Steve. Much appreciated.

Gareth wrote:Have you still got the lock ring from your old tank ? It may be a better fit if its an original part.

Hi Gareth

Yep...still got the old one, but it's in really bad shape - very crooked!

Update....

Straightened out the old locking ring..... Seems to holding so far.

Fingers crossed....good work!!

I've read on quite a few forums that the repro castellated locking ring/gaskets create a crap seal and leads to leaking.

I've got all new stuff to go on mine (inc tank)..........so will be interested to see what the fit is like on new vs old!

Dave81 wrote:I've read on quite a few forums that the repro castellated locking ring/gaskets create a crap seal and leads to leaking.

I've got all new stuff to go on mine (inc tank)..........so will be interested to see what the fit is like on new vs old!

Hey Dave - suggest keeping the old locking ring !! Seems that was the only thing that was going to work for me.. Like you said, the new repro stuff just isn't the best quality or even the same thickness of metal.

Sean wrote:

Dave81 wrote:I've read on quite a few forums that the repro castellated locking ring/gaskets create a crap seal and leads to leaking.

I've got all new stuff to go on mine (inc tank)..........so will be interested to see what the fit is like on new vs old!

Hey Dave - suggest keeping the old locking ring !! Seems that was the only thing that was going to work for me.. Like you said, the new repro stuff just isn't the best quality or even the same thickness of metal.

Yes mate. That was the common theme. New sender, tank and gaskets are good but the original ring is slightly thicker and gets a better seal.........go figure! You would have thought it would have been identical!