BT losing residual fuel pressure

[marvinng]

my BT is losing residual pressure. after shutting down the engine, residual pressure drops from 40 psi to 30 psi in less than 2-3 mins ... down to 0 psi in 15-20 mins. here is what i have:

fuel pressure reg ... replaced 2 yrs ago w/ TOMS adjustable FPR.
fuel pump ... replaced 1 yr ago w/ mr2 gze fuel pump (OEM).
injectors ... cleaned 3 months ago. i was told they have been pressure tested and were fine.

after the fuel pump was replaced and the injectors were cleaned, the problem remained. i pulled the fuel return line after shutting the engine; there was no leak from the FPR but the residual pressure was still dropping.

symptom: hard starting when the engine is warm/hot.

any clues on what else can go wrong or what to look for? thanks in advance.

marvin

[Ivan141]

I dont know what kinde of pressure drop is normal, but I can imagine it's the fuel pump that's allowing the pressure to escape. Lot's of cars prime the fuel pump before starting, ae86's dont do this, might be something you'll have to live with.