My 1989 Bravo fuel pressure typically runs around low 20's PSI (almost in the yellow) on the mechanical pump. But when I turn on the boost pump it jumps to around 50 PSI (almost in the red) and FF drops by 2/10 gph. Any other Bravo owners experience this? My mechanic says we need to look at the mechanical pump as there may be a leaky seal or diaphragm torn inside. Any ideas? Thanks, Dave