Help! fuel pump doesn't prime. nothing :(
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This is a discussion on Help! fuel pump doesn't prime. nothing :( within the General Maintenance, Troubleshooting & Accidents. forums, part of the Tech & Modifying & General Repairs category; Okay, I have a 2004 wrx. When I turn the ignition switch to acces. There is no prime on my ...

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    Registered User flytime's Avatar
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    Help! fuel pump doesn't prime. nothing :(

    Okay, I have a 2004 wrx. When I turn the ignition switch to acces. There is no prime on my fuel pump. Nothing. My engine turn over but doesn't start. I did a voltage check the fuel pump relay by the passenger compartment. With the ignition on accessory. I'm getting 12.3 volts reading from one side but the other side 0.00.

    Is it a bad relay? I also check the volts on the harness over by the fuel pump. I get about 6.4 volts. Please help a noob out.
    04 Impreza Wrx

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    Captain James of the SS Impreza has gone down with the ship Drews's Avatar
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    Either replace the relay or replace the pump. Your pump could very well be toast.
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    Registered User flytime's Avatar
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    Quote Originally Posted by Drews View Post
    Either replace the relay or replace the pump. Your pump could very well be toast.
    The one I have in it now is a walbro 255lph. I swap it out with my stocker but same thing. Nothing as well. I already have a relay on order. I'm hoping I don't have run new wires cause that would really suck.
    04 Impreza Wrx

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    Captain James of the SS Impreza has gone down with the ship Drews's Avatar
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    Quote Originally Posted by flytime View Post
    The one I have in it now is a walbro 255lph. I swap it out with my stocker but same thing. Nothing as well. I already have a relay on order. I'm hoping I don't have run new wires cause that would really suck.
    Why on earth would you need to run new wires?
    Hawk-Eye Alliance #Eleventy,000,000,000|N.E.R.D. Member 20,000
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    Resident Clubdub Debbie Downer. I'd love your ideas if you kept them to yourself. Subarus suck, get a new wife.

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    Registered User flytime's Avatar
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    Quote Originally Posted by Drews View Post
    Why on earth would you need to run new wires?
    I don't know, if it's short somewhere?
    04 Impreza Wrx

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    not likely a wiring fault.

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    Have you tried to directly connect your FP to 12 V and see if it works? If it does, then you need to focus
    other sections driving your pump , FP controller , power relay, ... etc.

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    Pro Manscaper Mikie13's Avatar
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    Relay.
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    Registered User flytime's Avatar
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    Quote Originally Posted by ride5000 View Post
    not likely a wiring fault.
    I'm hoping so. haha
    04 Impreza Wrx

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    Registered User flytime's Avatar
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    Quote Originally Posted by Spiider View Post
    Have you tried to directly connect your FP to 12 V and see if it works? If it does, then you need to focus
    other sections driving your pump , FP controller , power relay, ... etc.
    Yeah i'll need to try that after work
    04 Impreza Wrx

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    Registered User flytime's Avatar
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    Quote Originally Posted by Spiider View Post
    Have you tried to directly connect your FP to 12 V and see if it works? If it does, then you need to focus
    other sections driving your pump , FP controller , power relay, ... etc.
    i'm really hoping so!
    04 Impreza Wrx

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    Registered User flytime's Avatar
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    Update,

    Took my fp out and test it at the battery. It kicks right in. Fuel spits right out. Good thing I wore safety glass. So fuel pump is good. Waiting on that relay.
    04 Impreza Wrx

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    You could have also check your relay before ordering it. Disconnect the connection to FP. When not energized the terminal from 12V to FP/FPC will show open circuit. Then turn power on to energize the relay.
    If the two terminal when energized show short circuit or very low resistance, the relay is good if not then toss.

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    Registered User flytime's Avatar
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    Update

    Got the new relay in, turns out it's not the relay. No power to the fuel pump still. I'm stuck
    04 Impreza Wrx

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    Well then it is your Fuel Pump Controller. It is faulty. You need to get one second hand, buy a new one or go with an aftermarket one like this one:
    FUELPro fuelpro [FUELPro V1.2] - $149.99 : DCCDPro, Active Center Diff Control!
    which allows you to go with a more powerful pump if you ever decide to do so.

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