fuel starvation even in a straight line
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This is a discussion on fuel starvation even in a straight line within the General Maintenance, Troubleshooting & Accidents. forums, part of the Tech & Modifying & General Repairs category; Hello subaru gurus, I'm having fuel starvation issues since the install of my Walbro fuel pump . When my gas ...

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    fuel starvation even in a straight line

    Hello subaru gurus,

    I'm having fuel starvation issues since the install of my Walbro fuel pump . When my gas tank is anything BELOW 3/4 FULL, it runs into fuel starvation issues when I'm 3/4-WOT. Usually, this appears right at the 5200rpm mark. Btw, when I have the issue, it's not even in the middle of a turn. Pure straight away!

    Your help is greatly appreciated.

    I'm currently running a accessport upgrade map from PDX

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    Resident meany-rator 06wrx4me's Avatar
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    Sounds like fuel filter. Or a loose line on the pump.
    2014 Ford Fiesta ST

    06 WRX, HAWKEYE # 001 <T-boned and sold>

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    Quote Originally Posted by 06wrx4me View Post
    Sounds like fuel filter. Or a loose line on the pump.
    do you mean the fuel strainer at the end of the pump or the filter under the hood (silver tin thing)?

    I"m currently using the stock fuel strainer already. It's helped but still far from good.

    Everything on the fuel pump is really snug and tight. I thought that might be hte problem too but i check over it already..

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    Resident meany-rator 06wrx4me's Avatar
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    Quote Originally Posted by justinklam View Post
    do you mean the fuel strainer at the end of the pump or the filter under the hood (silver tin thing)?

    I"m currently using the stock fuel strainer already. It's helped but still far from good.

    Everything on the fuel pump is really snug and tight. I thought that might be hte problem too but i check over it already..
    I meant the filter under the hood (silver tin thing). When was the last time it was changed?
    2014 Ford Fiesta ST

    06 WRX, HAWKEYE # 001 <T-boned and sold>

    COILOVER TABLE
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    Quote Originally Posted by 06wrx4me View Post
    I meant the filter under the hood (silver tin thing). When was the last time it was changed?

    i got my 48k service done just recently. And the car was running fine after the service before i did all my mods (injectors, turbo, fuel pump)

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    Moderator Donkey's Avatar
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    Was the pump new or used?Have you checked for any leaking fuel?Pull the backseat and check the connections on top of the pump cover as well.See if any are wet.
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    Resident meany-rator 06wrx4me's Avatar
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    Quote Originally Posted by justinklam View Post
    i got my 48k service done just recently. And the car was running fine after the service before i did all my mods (injectors, turbo, fuel pump)

    Did they replace the fuel filter at 48k? Are your injectors leaking?
    2014 Ford Fiesta ST

    06 WRX, HAWKEYE # 001 <T-boned and sold>

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    Administrator Trainrex's Avatar
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    What mods and engine management are you using?

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    Quote Originally Posted by Donkey View Post
    Was the pump new or used?Have you checked for any leaking fuel?Pull the backseat and check the connections on top of the pump cover as well.See if any are wet.
    Yes the pump is brand spankin' new. I have pulled the rear seats off and the cap where the fuel pump is. it is dry and all conenctions are nice and tight.

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    Quote Originally Posted by 06wrx4me View Post
    Did they replace the fuel filter at 48k? Are your injectors leaking?
    I got new o rings before installing. Those cost an arm and a leg but I went all out cause i iddn't want to run into these issues so no, i don't think they are leaking.

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    Quote Originally Posted by Trainrex View Post
    What mods and engine management are you using?
    04 wrx
    Pdx accessport map upgrade EM
    vf35 turbo
    sti pink injectors
    sti tmic
    walbro fuel pump
    catless up/dp (helix)
    greddy evo 2 cbe

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    Resident meany-rator 06wrx4me's Avatar
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    Has your fuel filter ever been changed?
    2014 Ford Fiesta ST

    06 WRX, HAWKEYE # 001 <T-boned and sold>

    COILOVER TABLE
    TURBO TABLE

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    Quote Originally Posted by 06wrx4me View Post
    Did they replace the fuel filter at 48k? Are your injectors leaking?
    yes they did replace the fuel filter under the hood

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    Geriatric Ginger Mod Rogan's Avatar
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    Ok, without trying to sound smartastic..

    are you sure its a fuel starvation?
    What's it doing, exactly? boost levels higher than before, with the new mods? Change the plug gap? At 5200 RPM, does it under WOT? What about 3/4 throttle, low boost?

    checked your fuel pressure? what is it idle? what about idle, with the vac. line disco'd?
    Rogan o_0
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    Quote Originally Posted by Rogan View Post
    Ok, without trying to sound smartastic..

    are you sure its a fuel starvation?
    What's it doing, exactly? boost levels higher than before, with the new mods? Change the plug gap? At 5200 RPM, does it under WOT? What about 3/4 throttle, low boost?

    checked your fuel pressure? what is it idle? what about idle, with the vac. line disco'd?
    I don't have a fuel pressure gauge so i couldn't really tell you.

    What does the car do, it builds boost and pulls and once it gets to a certain part on the revrange, it stops pulling momentarily (like a second), repulls, and backfires. It will keep doing this continuously like pow pow pow until i lay off the accelerator. This happens when the throttle is at anywehre MORE than 3/4 pinned.

    boost levels are lower than before. They are still using the same spark plugs however those will be changed very soon.

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