98 5.7 K1500 Cranks But Won't Start. Fuel Pump?

Discussion in 'Engine Performance + Maintenance' started by NoahNeedsHelp, Apr 9, 2018.

  1. pro17

    pro17 OBS Enthusiast

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    Smack on the tank a few times. Ive seen that wakes a pump up. If it comes back just by hitting on it then go ahead and replace it. But at least with it coming back on you can move it somewhere safe to work on.
     
  2. superdave

    superdave Proud NOOA Member

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    Take the top off the throttle body, open up the throttle blades and spray some starter fluid in. Put the top back on the throttle body and crank it. If it is not getting fuel, it will fire or try to fire up with the starter fluid and then die. That will be a good indicator of the fuel pump
     
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  3. NoahNeedsHelp

    NoahNeedsHelp Newbie

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    Thank you Dave, and thank you all for a starting point. I'll get after it this weekend and report back.
     
  4. NoahNeedsHelp

    NoahNeedsHelp Newbie

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    I just hooked up the fuel pressure gauge, cranked it, and had ZERO reading. Interesting, when I initially turned, the engine coughed like it had a drop of fuel. Maybe when I unscrewed the test port, fuel in the line moved down. Either way, subsequent attempts were just clean cranks, no coughs or anything. I got underneath and followed the lines back to the tank and found a hose that is twisted, and it looks pinched tight. It's the line that goes to the filter. Anyone seen that before? photo 2.JPG
     
  5. Eskimomann209

    Eskimomann209 I'm Awesome

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    That’s weird..
    Disconnect the line and untwist it...
    Could just be the return line tho...
    Not that it’s good either way.
    My pump has whined since I owned the truck that was 05...
    I thought it was normal lol
     
  6. mountie

    mountie OBS Enthusiast

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    My '88.... The fuel pump is in the gas tank... I never hear it run....

    Are later years located somewhere else?

    ( Twice in 6 years, my truck suddenly wouldn't start... It was the coil in the distributor.)
     
  7. DESSERTNOVA

    DESSERTNOVA Newbie

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    You could locate the fuel pump relay and pop off the plastic cover of relay and manually operate to see if the pump kicks on. Also use a volt ohm meter and ensure power is at the relay and traveling through the relay when manually engaged.
     
  8. NoahNeedsHelp

    NoahNeedsHelp Newbie

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    The pump is also in the tank. It's a high pitch whining that could be heard before startup and while it was running. sounds like a loud mosquito.
     
  9. NoahNeedsHelp

    NoahNeedsHelp Newbie

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    I tested the relay to the best of my ability, but understanding how the electrical components work is really beyond my pay grade. (Not to mention you can fry your computer if you don't know what the heck you're doing.) The results that I did get support the notion that the fuel pump needs replaced. And I think the kink in the fuel line caused the pump to go out. So I'm going to order a new pump, drop the tank, install new pump and replace that fuel line.

    Thank you all for responding, and I'll let you know when the pump is in and she's back on the road! Probably about 10 days from now.
     
  10. NoahNeedsHelp

    NoahNeedsHelp Newbie

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    As far as I could tell, there is power, the relay works, and I couldn't get the pump to kick on whatsoever. I think it's new pump time.
     

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