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  1. #1

    Default Cranks, got fuel, got spark but wont start

    Have a 98 C3500 2WD, 5.7L. Purchased vehicle a month ago. Drove it down from Michigan to North Carolina and it ran great. Has 56K. Last weekend went to start and it would just crank and not start. Has plenty of fuel. Did not pop any DTC codes. I put new fuel filter on. I hear fuel pump cycling. But, when I put fuel pressure gage, I get no reading. So, I double check my gage on another vehicle and it is working fine. Prior to connecting fuel filter, I cycled fuel pump and it put out like a fire hydrant. So, I then I suspect a blockage in fuel line from filter to throttle body. I remove Schrader valve and clean and also blow air into fuel line to clean any potential blockage. All seemed clear. I am getting fuel to throttle body. But again, no pressure reading on fuel pressure gage. So I suspect that the fuel pump is pumping but not at sufficient pressure. Am I on the right track. Appreciate any help......thanx...

  2. #2


    Welcome to the club. May have a bad fuel pressure regulator.

    2005 Chevy Silverado Z71 Crew Cab
    6" Skyjacker lift w/Edlebrock dual front remote resoviour shocks, single rear remote. Rancho skid-plate.
    17" x 9" M/T Classic Lock Wheels, 35" BFG A/T or M/T tires
    4.10 PercisionGears w/factory locker, T/A Performance rear-end cover
    Banks CAI intake, ported throttlebody, JBA coated headers, over-sized Magnaflow cats, Magnaflow cat back exhaust, Diablo tuned
    B&M aluminum deep transmission pan
    Warn brush guard w/Warn 9.5 XP winch, PIAA bulbs, Line-X bedliner, AWS Black tool chest, Extang tonneau cover
    Weather Tech floor mats
    Cover-Craft seat covers
    Dash mat cover
    Formula One window tint
    One black Lab in rear seat.

  3. #3


    I thought that, but the pressure regulator is after the the pressure check valve. So not quite sure that would be the cause. I've read here and also the service manual that a fault pressure regulator will give high or low pressure readings. Right now, I am not getting any pressure readings at the pressure check valve. Thanx for responding..............

  4. #4


    This is rare but I have seen it a couple times where on most chevys there is a small rubber hose between the fuel pump output line going into the sending unit that rots out and gets a hole in it so its not pumping the fuel out of the sending unit. It could just be something as simple as that so it might be worth pulling the sending unit out if you cant find anything else.

    Good luck!
    1995 C1500 4.3L 2WD. JET TBI Spacer, JET stage 1 chip, 10mm Taylor custom wires, Pulstar Iridium Pulse Plugs.
    260k miles and still going strong...

  5. #5
    stephan's Avatar
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    Sep 2010
    Far West, Oregon USA,
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    Welcome to the club Bertram. X2 on the FP regulator. It doesn't matter that the regulator is after the pressure check valve. If it's open (faulty) & allowing full flow to return, it won't show any pressure on your guage.

    **edit,, to clairify... if your press regulator was before your press check valve for the guage, then you would effectively be measuring the return pressure rather than the supply pressure.

    This could also be what Crispyt has posted, but like he said it is rare, & since your pump is putting out like a fire hose I would save that for last cuz it's a pita to access the fuel pumps.
    Last edited by stephan; 06-26-2011 at 08:48 PM.
    1988 Chevy C-3500 2wd (no pic)
    350 c.i. 5.7 L Stock Block, 4 Bolt Mains
    L-31 Vortec Heads, Edelbrock Cam & Intake,
    Holley 650, Flowtech Headers, Magnaflow exh.
    Jet Trans 700R4, B&M Ratchet, 4:10 gears,
    3" susp. lift kit "shadetree"
    No rev limiter, No speed limiter lol

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