no start 92 1/2 ton p/up

1992 chev 1/2 tonne p/up 4.3l TBI 4spd o/d. 307 km, no start. There is spark and feul delivery to tbi just no spray from either injector. There is a new feul pump, new ign module, new ign coil, t-up, OLF, cat, . I don't have a node light to check injector pulse. help!:banghead: cheers

gentlemen, start your engines. I replaced the oil presure switch and all was fine. go go gadget.:grinyes: