2001 Chevy Blazer, at the moment stumped!

  • Guntar1.3
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3 weeks 5 days ago #201130 by Guntar1.3
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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3 weeks 5 days ago #201131 by nightflyr
Replied by nightflyr on topic 2001 Chevy Blazer, at the moment stumped!
Just a guess or two.
Faulty check valve on the fuel pump or perhaps a pressure regulator problem.

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3 weeks 5 days ago #201132 by Guntar1.3
Replied by Guntar1.3 on topic 2001 Chevy Blazer, at the moment stumped!
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.

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3 weeks 5 days ago #201133 by Tods213
Replied by Tods213 on topic 2001 Chevy Blazer, at the moment stumped!
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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3 weeks 5 days ago #201136 by Guntar1.3
Replied by Guntar1.3 on topic 2001 Chevy Blazer, at the moment stumped!
Unfortunately that may be my next step is rip that sucker apart again...

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