Question about 1998 Chevy C/K Pickup 2500 Performance Exhaust System

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Hi. i have a 98 chevy 4x4 k 2500. the spider injectors wont hold fuel pressure

I put a tester on it and it reads 65 pounds of fuel. when it kicks out the gauge drops to zero and gas is going back down the return line to tank.

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When it kicks out ??? explain more please

Posted on Dec 29, 2013

  • 22 more comments 
  • andy groves
    andy groves Dec 29, 2013

    ok. i have the fuel pressure gauge on the line. i get in and turn the key, the gauge goes up to 65 pounds, fuel pump kicks off and gauge drops back to zero. the gas is going back down the return line to the tank. its suppose to hold pressure in the spider and wont.

  • andy groves
    andy groves Dec 29, 2013

    i put a new fuel pressure regulator and fuel pump in.

  • Behind_Blue_Eyes
    Behind_Blue_Eyes Dec 29, 2013

    defective spider... key on computer cycles fuel pump for two seconds, will not turn it back on until it sees oil pressure... most likely you have a blown defective regulator

  • andy groves
    andy groves Dec 29, 2013

    i have other spider injectors ive tried and there the same way, dont understand how the spiders work.it starts and quits, but its tore apart now, trying to figure it out. oil pressure was above 40 the last time it ran

  • Behind_Blue_Eyes
    Behind_Blue_Eyes Dec 29, 2013

    how about we start over... whats the problem ???

  • Behind_Blue_Eyes
    Behind_Blue_Eyes Dec 29, 2013

    how do you know its returning to the tank and not leaking out of an injector???

  • andy groves
    andy groves Dec 29, 2013

    i have it all toar apart. no injectors are leaking. took return off and it pours right out. not sure if my new fuel pressure regulator is bad. spiders are really exspensive. hate to buy one and thats not the problem.

  • Behind_Blue_Eyes
    Behind_Blue_Eyes Dec 29, 2013

    I know they are. I would check the regulator for proper installation. you say it pours out? does it pour out when the fuel pump is on for those 2 seconds ??? yes, then check and recheck the regulator. if everything looks good then suspect a spider assy cracked internally ???

  • andy groves
    andy groves Dec 29, 2013

    ok. appreciate it. it holds pressure till pump kicks off. im heading out to garage to mess with it some more.

  • Behind_Blue_Eyes
    Behind_Blue_Eyes Dec 29, 2013

    then it can't be flowing out the regulator... because the regulator is holding pressure... that is a spring loaded pressure regulator if I remember correctly and the only way it can bypass is in the event of over pressurization...

  • andy groves
    andy groves Dec 30, 2013

    nope. its like the gas goes in and turns around and runs back out the return line.

  • Behind_Blue_Eyes
    Behind_Blue_Eyes Dec 30, 2013

    OK so here is what I am understanding... You turn the key on, the fuel pump cycles for two seconds and the gas pours out as fast as the pump feeds it ??? Then you have a malfunctioning pressure regulator, a damaged spider assy and/or both. Now what's puzzling is how you managed to get pressure because you shouldn't unless the regulator is blowing open after it reaches your mentioned 65 psi and then it wont close until all pressure is gone which should led to a defective regulator. So with all this being said. It comes down to back to where you started. Which is what I asked earlier. What was the original problem ???

  • andy groves
    andy groves Dec 30, 2013

    truck starts and quits, will only hold pressure when fuel pump is running, when pump shuts off pressure drops to zero, and gas goes down to tank threw the return line

  • andy groves
    andy groves Dec 30, 2013

    i put two more regulators on that are used that a guy let me borrow. still did the same thing.

  • Behind_Blue_Eyes
    Behind_Blue_Eyes Dec 30, 2013

    truck starts and quits... which makes sense, pressure then none... it doesnt run long enough to build oil pressure to keep pump running because there is not fuel pressure... ok do you see where I am going here... plug the return line and see if the truck stays running. if it does then the spider is the problem... pressure regulator is vacuum control through the intake plenum if I remember... without vacuum it should hold pressure until the oil pressure kicks up and causes pump to turn on and then with vacuum applied to regulator it keeps the static pressure somewhere between 35-45 psi... so with the engine not running the regulator should hold pressure for hours, roughly... does this all make sense now

  • Behind_Blue_Eyes
    Behind_Blue_Eyes Dec 30, 2013

    doesnt matter if there is a problem internally with the spider... you can hang new/used regulators all day long. if it cant seat properly the regulator is going to leak past. if something is in the holding it open, its not going to seat properly.... if you plug the return line and cycle the key and it holds pressure, you know your problem is with the spider assy... I don't recall GM every using an electronic regulator... correct me if I am wrong then we look at a hole other problem...

  • andy groves
    andy groves Dec 30, 2013

    everytime i turn key to make fuel pump run, gauge goes to 65, pump shuts off, gauge drops to zero, i unhooked the return line, had a friend turn the key, and gas came out of the return, when pump shut off gas kept running till drained

  • Behind_Blue_Eyes
    Behind_Blue_Eyes Dec 30, 2013

    dont run it very long with the return line plugged as you will dead head your pump and potentially blow it out...

  • andy groves
    andy groves Dec 30, 2013

    ok, good thing you said that cause i been thinking about putting in a shut off valve to see if truck would run, keeping some gas from draining back.

  • andy groves
    andy groves Dec 30, 2013

    ok. somehow i didnt see your other comments, makes sence, no they didnt make an electronic one, im a big chevy fan, but this is the worst designed motor they ever built

  • Behind_Blue_Eyes
    Behind_Blue_Eyes Dec 30, 2013

    no its a horrible design for the fuel injection system... the engine itself is actually pretty good... A simple carb, ignition swap and you'll gain about 60 hp :-)

  • andy groves
    andy groves Dec 30, 2013

    i have been thinking about it, just not sure what all i would have to do to make it run

  • Behind_Blue_Eyes
    Behind_Blue_Eyes Dec 30, 2013

    A lot of work and expense... but cant be much more expensive then the new spider LOL... any good trucking magazine will have how to articles archived, do a search. I stopped driving cars 2 years ago and now I ride motorcycles only...they break, sell one buy another. I've had 3 in 4 years, minimal maintenance :-) but I also live in Florida

  • andy groves
    andy groves Dec 30, 2013

    have to check into it. friend of mine already has the intake, if i knew what distribitor to use and wiring. probably wouldnt be hard to do. its to cold up here for bikes, but that would be the way to go, if i lived down there

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