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No fuel pressure

This is a discussion on No fuel pressure within the General Help forums, part of the LSx Technical Help Section category; Hey needs some quick help if anyone online. I just completed putting engine back together after a heads and cam ...

  1. #1
    Junior Member Fastdaddy's Avatar
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    No fuel pressure- Found it- It was a ground issue

    Hey needs some quick help if anyone online. I just completed putting engine back together after a heads and cam job. Motor turns over just fine not weird noises. I don't have any fuel pressure, and the guage is not working. Do you feel that this may just be a fuse? Advise if you got it.
    Last edited by Fastdaddy; 10-28-2009 at 09:49 PM.

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    ʢ ൧ ൨ ൩ ൪ ൫ ൬ ൭ ൮Ր Ց Ւ Փ Smittro's Avatar
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    Quote Originally Posted by Fastdaddy View Post
    Hey needs some quick help if anyone online. I just completed putting engine back together after a heads and cam job. Motor turns over just fine not weird noises. I don't have any fuel pressure, and the guage is not working. Do you feel that this may just be a fuse? Advise if you got it.
    I'd say if it worked before the head job, go over everything again, including fuses..
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    ʢ ൧ ൨ ൩ ൪ ൫ ൬ ൭ ൮Ր Ց Ւ Փ Smittro's Avatar
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    Did you have your tank out? Forget to plug the harness back in?

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    Junior Member Fastdaddy's Avatar
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    Quote Originally Posted by Smittro View Post
    Did you have your tank out? Forget to plug the harness back in?
    No tank removal. Had zero issues prior to installs. Have not check any fuses yet. Will do that next.

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    Quote Originally Posted by Fastdaddy View Post
    No tank removal. Had zero issues prior to installs. Have not check any fuses yet. Will do that next.
    Yeah, it was just a thought incase you desided to upgrade your pump while doing heads..

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    Junior Member Fastdaddy's Avatar
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    Quote Originally Posted by Smittro View Post
    Yeah, it was just a thought incase you desided to upgrade your pump while doing heads..

    Good point for sure. Where exactly is the fuse panel on this thing. I have no manual so I need to know which fuse it might be.?

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    Senior Member Redphoenix1998's Avatar
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    yeah check your fuses. it's common to unplug the fuse to the pump to prime the fuel system.

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    Can you hear the pump when the key is in the run possition? Can't figure why a fuse would pop doing heads, but it is possible if the battery was still connected or one of the terminals bumped the batt while you were working on it..

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    Junior Member Fastdaddy's Avatar
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    Quote Originally Posted by Smittro View Post
    Can you hear the pump when the key is in the run possition? Can't figure why a fuse would pop doing heads, but it is possible if the battery was still connected or one of the terminals bumped the batt while you were working on it..
    Yeah, you know how things kinda go nuts when your hooking ground back up.

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    Check for pinched pump leads too. I dunno just throwing stuff out there. Crazier stuff has happened..

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    Alabama Member bamaz28's Avatar
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    are we sure its primed

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    Junior Member Fastdaddy's Avatar
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    Quote Originally Posted by bamaz28 View Post
    are we sure its primed
    no, not sure at all. I have never taken fuel rail off before and i was thinking some kind of air lock? Primed? What's the best way to do that?

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    Alabama Member bamaz28's Avatar
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    do you have pressure at the filter? i think you can simply have the ignition on and but first pull the line off the filter to see if you have pressure there first. rule out its the pump before going farther.

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    Junior Member Fastdaddy's Avatar
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    Quote Originally Posted by bamaz28 View Post
    do you have pressure at the filter? i think you can simply have the ignition on and but first pull the line off the filter to see if you have pressure there first. rule out its the pump before going farther.
    good point. Will check that out soon I as can. All fuses checked out as far as I could tell. Still don't here anything like a pump coming on at the turn of the day. Thanks for the input.

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    Fuel pump relay? Any ground wires get unbolted? Were fuel lines plugged off with anything while disconnected?

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    Alabama Member bamaz28's Avatar
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    Quote Originally Posted by Fastdaddy View Post
    good point. Will check that out soon I as can. All fuses checked out as far as I could tell. Still don't here anything like a pump coming on at the turn of the day. Thanks for the input.
    GLAD to help

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    Senior Member Redphoenix1998's Avatar
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    No pump running that you could hear....hmm....Well, just to be sure, take a transmission funnel, stick it in the gas tank, ask a friend to key it on and listen. If you don't hear anything, check your connections to the pump. Make damn sure the fuse is not blown. If everything looks good, replace the replay to be safe by just swapping it with a relay you won't really need at the moment. Just make sure it is the same type of relay. Then see if it primes. If it does, then get a new relay

  18. #18
    Junior Member Fastdaddy's Avatar
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    Quote Originally Posted by Redphoenix1998 View Post
    No pump running that you could hear....hmm....Well, just to be sure, take a transmission funnel, stick it in the gas tank, ask a friend to key it on and listen. If you don't hear anything, check your connections to the pump. Make damn sure the fuse is not blown. If everything looks good, replace the replay to be safe by just swapping it with a relay you won't really need at the moment. Just make sure it is the same type of relay. Then see if it primes. If it does, then get a new relay
    All lines look good to pump. Is the relay under hood the only fuse link there is to the pump? I know there is a guage fuse in door panel, but that good. Other guages work. The fuel guage will not read anything, it stay below the E. I put extra fuel in just to make sure not out of gas...that would be to easy.

  19. #19
    Veteran 0rion's Avatar
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    relay is under the hood on the drivers side

  20. #20
    Junior Member Fastdaddy's Avatar
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    Found it..Thanks for everyone's help. It turned out that I grounded one of the ring terminals that I think was on the rear of one of the heads to one of the valve cover bolts, which is not a good ground since it's insulated with rubber gasket. Screwed it to fire wall and pump fired up. Dyno and tune coming up and will post some results. Thanks again.

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