Cat 953 locking fuel cap

[RParr]

I have an early 953 (77y serial) and the fuel tank has been rusting up and clogging filters. I found a 953b plastic tank with a different style cap and I cant seem to get it off. The part looks like a Cat 5G3612. Whats the trick on these locking caps? Thanks

 

[RParr]

I figured it out. There was a broken plastic ring inside the cap. I ground off the top rivets which allows access to the metal part of cap. A bit of heat and a punch got it off.

 

[LeakyBoot]

Are these a vented cap or does the 953C use some sort of different fuel tank vent?

 

[RParr]

Yes, under the main cap, it looks like there is a venting mechanism.