The IO-360-A3B6 on my Mooney seems to be lossing pressure. 5 years ago
it would show 25 to 30 lbs of fuel in cruise. Now I"m getting 20 lbs
(steady, not bouncing), it also drops down to about 15 after shutting
off the electric pump for about 1 second. These values are all within
the green range but I"m wondering if I should send it out at annual.
Any suggestions on where to send it?
What should I expect to pay??

-Robert