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Still wont start after fuel pump install

This is a discussion on Still wont start after fuel pump install within the General Help forums, part of the LSx Technical Help Section category; Ok I am at a loss. Thought the fuel pump was bad in the 2000 WS6 but after installing and ...

  1. #1
    Junior Member OneFastZ's Avatar
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    Still wont start after fuel pump install

    Ok I am at a loss. Thought the fuel pump was bad in the 2000 WS6 but after installing and rechecking everything the car still won't start. I have check all fuses and I changed the fuel filter also.

    Anyone have any idea please

  2. #2
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    Is the car cranking, just not starting? Even without a scan tool there's some things you can check here: www.gearchatter.com/viewtopic8945.php

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    Junior Member OneFastZ's Avatar
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    not getting any fire

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    Junior Member OneFastZ's Avatar
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    oh and the VATS has been bypassed with a resistor

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    Member headpecker's Avatar
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    did you check your ignition relay?

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    Junior Member OneFastZ's Avatar
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    no where is it located?

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    What made you think the pump was bad, was there no pressure?

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    Junior Member OneFastZ's Avatar
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    yea there was no pressure at the rail.

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    ok.........i'm new here.........whats VATS?

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    Electrical Engineer KMdef9's Avatar
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    Relay is pretty common to go out as mentioned. It's under the hood with the other fuses, I think.

    Do you hear the pump "whine" when you first turn the key?

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    Electrical Engineer KMdef9's Avatar
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    Relay is located in a plastic block, in the lower right hand corner under the hood.

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    I would start with checking all ignition related relays. It's easy to swap them out to find a bad one -- just borrow one from a non-ignition system, like the AC, headlights, or whatever may be identical. Did you happen to check the fuel pressure at the rail since installing the new pump? Any chance your VATS bypass has gone awry?

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    I dont know what vats is......what is it?

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    oh and yes you can hear the pump run for about 2 seconds when you turn the key.

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    Junior Member OneFastZ's Avatar
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    Quote Originally Posted by pajeff02 View Post
    I would start with checking all ignition related relays. It's easy to swap them out to find a bad one -- just borrow one from a non-ignition system, like the AC, headlights, or whatever may be identical. Did you happen to check the fuel pressure at the rail since installing the new pump? Any chance your VATS bypass has gone awry?
    redid the vats just to make sure and its still the same. I am leaning towards crank position sensor since I have no spark. I can hear the racetronics pump prime so I assume its ok.

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    Quote Originally Posted by adamz47 View Post
    I dont know what vats is......what is it?

    Probably stands for "Vehicle Anti Theft System" or something. It's the chip embedded in the ignition key that always seems to frog up and then the car won't start. Lots of guys run a bypass with a resistor that you can buy at Radio Shack. You just have to match it to the resistance of your ignition key for it to work.

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    Electrical Engineer KMdef9's Avatar
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    Quote Originally Posted by OneFastZ View Post
    redid the vats just to make sure and its still the same. I am leaning towards crank position sensor since I have no spark. I can hear the racetronics pump prime so I assume its ok.
    Something isn't right with the fuel system if...
    Quote Originally Posted by OneFastZ View Post
    yea there was no pressure at the rail.
    How did you test spark? With a tester or old-school-hold-it-to-the-block?

    Also, I might be wrong on this, but if the crank position sensor is bad/not working, dont you still get a spark?

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    Big Gulps, huh? HOBS's Avatar
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    My car did something similar last year. It would crank but it wouldn't fire, no codes/lights, fuel pump would prime. I started swapping relays it fired right up. I swapped the relays back just to confirm and it still started like nothing had ever been wrong. No idea what was wrong with it but it hasn't had a hiccup since. Maybe yours is special in a special sort of way like mine.

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    Junior Member OneFastZ's Avatar
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    Quote Originally Posted by HOBS View Post
    My car did something similar last year. It would crank but it wouldn't fire, no codes/lights, fuel pump would prime. I started swapping relays it fired right up. I swapped the relays back just to confirm and it still started like nothing had ever been wrong. No idea what was wrong with it but it hasn't had a hiccup since. Maybe yours is special in a special sort of way like mine.
    I have tried that to with no luck.

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    Junior Member OneFastZ's Avatar
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    Quote Originally Posted by KMdef9 View Post
    Something isn't right with the fuel system if...


    How did you test spark? With a tester or old-school-hold-it-to-the-block?

    Also, I might be wrong on this, but if the crank position sensor is bad/not working, dont you still get a spark?
    Old school with a screwdriver next to the plug wire (unplugged of course)

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