Reply To: OMC Pressure Tanks

[RICHARD A. WHITE]

Buccaneer wrote:

Randy White, Sr wrote:

Just went thru this with my OMC Cruis-A-Day Jr 4 gallon tank.  From everything I read, the diaphragms with the extra hole were for use with the aluminum push button, the rod of which attaches to metal washers on both sides of the diaphragm.  Older designs came wing the hole and with later designs, you add your own hole.
As to the filler cap, mine had the chain slot in its washer and the beaded chain.

Not talking about the hole for the primer shaft, but rather the
big “extra” hole in my photo that has the question mark.

Tore apart another tank today, and it had a normal diaphragm
without the extra big hole.

Tom,
Notice in Randy’s photo, he has the same gasket you are referencing, with that big extra hole….
I would surmise it was the original gasket, that was changed, but seemingly no record of the change.

Richard

http://www.richardsoutboardtools.com
classicomctools@gmail.com