I like the check valve suggestion. Not sure how to prove it, perhaps
you could remove the intake filter and put a soap bubble over the
intake. But then if the leak is going through the oil bath of the
pump...... You would need to have a diagram of the pump to figure out
hot to test the hypothesis of a check valve leak.

Richard


wrote:
If my ballpark calculations are correct, you're losing 3.7 gallons of
air (at atmospheric) per hour, so you should be able to see bubbles when
you hit it, unless it's distributed over a lot of joints, each leaking a
little bit.


Or.......

Leaking back thru the checkvalve, into the cylinder and out the
crankcase or intake valve?

Did you spray soap in those areas ??

Grummy



--
http://www.fergusonsculpture.com
Sculptures in copper and other metals