94 blazer starting problems and also need directions on how to change a fuel pressure regulator?

Best bet is to take the vehicle into a reputable repair facility for a proper diagnosis. I would not suggest throwing parts at the vehicle hoping for a quick and cheap fix.

i don't be attentive to off hand what gasoline presure specs. are for a ninety pontiac 6000. i think of typicaly its a sprint decrease at around 35 psi idling. whether, i does no longer complication approximately that real now as 6 kilos of gasoline presure won't reason as drastic a concern your describing. It looks like the gasoline presure regulator is doing this is activity of regulating gasoline presure. the regulator has a vacum line to the ideal of it. whilst the engine is idling there is aprox. 20 inches of manifold vacum pulling on the diaghram on that gasoline reg. which permits gasoline to bypass in the previous, 40-one psi as you reported to be precise. once you strengthen up manifold vacum decreases to the regulator. with a loss of vacum pulling on the diagphram it takes extra gasoline presure before gasoline can bypass, 40 5 psi as you reported. Its like a mechanical gasoline enrichment each time you strengthen up....anyhow. Alot of cases the diagphram interior the regulator will burst and alow gasoline to bypass into the the vacum line which suits on your intake manifold, which motives the engine to run very wealthy. Pull off the vacum line to the regulator, if gas is interior the vacum line the regulator is undesirable. If that's no longer your concern deliver me an e mail and we can communicate approximately another opportunities.