Leaking Petrol Cap

[Phil-UK]

I am getting annoyed with this so am seeking advice.
When I restored my CB72 the petrol cap leaked if you filled the tank within 1" of the top; not just a
dribble but a proper "slop" down the side.
Since then I have tried bending bits of the cap, tweaking the lip of the opening in the tank and of
course replaced the cork washer ( and tried soaking it first so it swells up ) - all to no effect.

This is just a nuisance on short runs but will be a real pain if I go to France during the summer
and need to fill it up.Its also an MOT ( Ministry of Transport ) test fail so I always take it to be
tested with a near empty tank.

My thoughts are that maybe the top of the tank was bashed at some point and the opening is
lower than it should be - hence the cork washer doesn't seal against anything; but I don't have another tank to measure it against.

Any ideas, comments or measurements ( height of lip of opening above tank ? ) would be
most welcome,

thanks

Phil Lou ( UK )

[ggray]

Could be the "LIP" has a ding or low spot that is not letting the gasket seal properly.

When prepping my tank, I used a straight edge and a file backed piece of sandpaper to "level" out the filler lip. If I showed a low spot, I bumped the inside surface to bring it back to height. So far, so good. I also am using a rubber gasket, not the cork.

Gary

[Phil-UK]

Thanks Gary - will see if I can find a suitable piece of rubber, well worth a go.

Phil

[ggray]

Not sure, but try www.cmsnl.com They may have them.
They're in the Netherlands

If not, try www.classichondarestoration.com here in the colonies.

It's where I got mine

Gary

[Buck]

The rubber gas cap gasket is still available from your local Honda dealer.