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okay folks a little preface, bought the Blazer not running for pennies, previous owner put a bunch of e85 in it and it stopped running. changed oil, drained fuel as much as i could, put in a few gallons of gas, changed plugs, changed spider lines with updated set from delco but still runs terrible. I’m sure I have a fuel issue so here is what I have:
Pressure readings:
Key on: 62 psi then when pump kicks off drops to 48-49 psi and steady falls, all while the key is on. not super fast but steady
Key off: maybe drops 2 psi per 30-50 seconds for a while till it hits 0
Cranking: 62-64 psi hard starting
once it starts: 80-100 psi and chugs terribly and barely runs,
no signs of external leaking but is super rich smelling and dark black sooty plugs.im running out of directions, any help is much appreciated thanks everyone!
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I mean I suppose it could be the pressure regulator but it’s brand spanking new. Then again maybe the e85 ate up the fuel pump and destroyed the check valve I can definitely “hear” it more than a normal truck and I am far from a novice mechanic.
I only say this because my dad did it when he replaced the fuel spider in his blazer and he had the exact same symptoms. It is possible you nicked an o-ring during assembly. Have you tried pulling the upper plenum and getting a visual on the lines with the fuel system pressurized? Even a small leak would cause the truck to run rich, fowl the plugs and slowly lose fuel pressure when shut off.
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