Actually I would put the pump between the 2 micron filter and the on engine
filter. Have you changed the on engine filter recently?
are usually a result of a problem connection in the fuel
line or faulty O ring on the Racor
filter housing. Also could be a pinhole leak in the fuel
pickup tube inside the fuel tank
. The Racor
filters have a large O ring near the outside of the top piece and another on the T handle. These both need to be checked and replaced if necessary. Another source of air leak is the bottom drain assembly on the Racors.
Edit: the on engine filter is a pressure filter and meant to be downstream of the pump.