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2G GSX Bucks under certain conditions

Posted by tdd536, Sep 14, 2018

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  1. tdd536

    tdd536 Probationary Member

    Joined Sep 14, 2018
    Elkhorn, Wisconsin
    Heres my issue:
    When the fuel tank is below lets say 1/2 tank (gague is broken so i'm just guestimating) I get a condition where it feels like a large buck (hitting a brick wall) happens when accelerating quickly. When the tank is full or near full, this bucking does not occur. I have read up on fuel cut/boost leaks, and cannot find anything that relates to fuel tank level. I have replaced the fuel filter and fuel sock, and my fuel feed line is 6AN.

    fuel system (-6AN feed line, stock injectors, stock regulator)
    Stock turbo
    Injen style intake
    Megan racing downpipe
    Greddy (likely replica) exhaust from downpipe back
    crushed 1g bov
    stock ecu

    I have recently done a clutch job and most of the IC piping had to come off for it, as I have a side mount. I clamped down the hoses as tight as I could get it, and inspected the hoses for any tears or cuts. The condition still occurs. I am basically ruling out boost leaks.

    I accidentaly had my wastegate actuator not hooked up (fun, fast accident) to the line, and it boosted up to 20psi without an issue when I had a full tank.

    Fuel pressure regulator? Fuel pump? Too much air being seen by maf? I rule the last one out due to it not happening with a full tank.

    Please toss around some ideas, I really am stuck here and want to remedy this issue as it causes me to make too many trips to the gas station.

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    My DSM:
    1997 Mitsubishi Eclipse GSX

    Street Build

    T25   manual

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