Line pressure down to 30 psi in 5 minutes? The spec. in the Shop manual is only to hold pressure for 10 seconds once the fuel pumps are shut off. Per the manual, the system should show 48-55 psi while the pumps are running with the engine off. When the engine is started pressure should drop 3-10 psi.
I don't think 5 minutes is relavent here. Sounds to me like your system is just fine.
Didn't you change your tune from last year? Change it back and see how it preforms.
Hans
