Pete C. wrote:
It sounds like he said the line comes from the bottom of the tank, goes
up to ceiling level and then back down to floor level where the burner
is.

As for the leak thing, it's quite possible to have a leak that lets air
in under suction conditions and does not leak any fuel outward when the
pump is inactive and the line is at a pretty neutral pressure.

Pete C.

Yes you have that right!

Then the leak would have to be up high somewhere? There are no joints
between the filter (down low) and the pump (down low).

I'll let you guys know what I find or do if it happens again. I am too
stubborn to call a repair man! Thanks!

Steve