1995 jimmy 4.3 vortec-w 122k miles.
replaced fuel filter,no help.
cold,ignition on,pump 55psi,drops to 50psi after 5mins and holds.
after about 10 start attempts, finally starts.
engine warm,idle,pump 56 psi.
quick accelleration test,64 psi.
pinch return fuel line test, 60 psi.
what should i do? replace pump? replace central mfi?or both?
Thanks.