Results 1 to 21 of 21

Thread: DIY: STi fuel pump install

  1. #1
    SLi O.G. anothernord's Avatar
    Join Date
    Sep 2008
    Location
    Ft. Collins, CO
    Posts
    2,027
    Points
    16,569
    Level
    82
    Points: 16,569, Level: 82
    Level completed: 44%, Points required for next Level: 281
    Achievements:
    10000 Experience PointsO.G.

    DIY: STi fuel pump install

    I am not responsible for anything you do to harm yourself, your car, or anyone else or anything in the world. Fuel vapors are flammable (duh), so DO NOT DO THIS INSTALL IN A CLOSED SPACE! DO IT OUTSIDE IN YOUR DRIVEWAY!


    My supercharger project requires that the engine get more fuel. The stock pump could produce the volume and pressure I need, but it would be at the upper limit of its ability. So for about $35 shipped on the Nasioc classifieds, I picked up a 2006 STi fuel pump with harness.


    NOTE: This install is identical to a sedan, except you must remove your rear seat in a sedan to access the tank.

    Tools Needed:
    -Phillips screwdriver
    -Needle nose pliers
    -8mm socket
    -Flat blade screwdriver

    Materials:
    -Fuel pump w/ harness
    -2 inch pipe clamp
    -1.5 inch rubber O ring*
    -Paper towels or rag

    *This can be subistituted for anything, really. You just need something for the pump to rest against that has some give for when you tighten it down.



    1. Remove the two clip/popper things from the rear floor panels with a flat blade screwdriver.



    2. Remove the four screws holding the cover plate down and take it off. (make sure it is the plate on the RIGHT side of the trunk area as you look in from the tailgate.)



    3. Depressurize the fuel system by unplugging the electrical connector, unscrewing the gas cap, and starting the car. It should die out after a little while. The fuel system should be depressurized.

    4. Using a rag, and the pliers, carefully remove the clamps on the hoses, and push them off the metal lines. Fuel will come out, but if it seems it is coming out under pressure, ...you probably didn't depressurize the fuel system. This stage is messy and the reason why you shouldn't do this in a closed space.



    5. Using the 8mm socket, unscrew the little bolts holding the sending unit cover to the fuel tank. Using more rags, lift the whole thing out of the fuel tank and place it on the ground. There will be gas everywhere so just let it sit until it evaporates.



    5. Unplug the stock fuel pump connector.



    6. Remove the hose clamps.



    7. Pull the whole pump out and remove the rubber hose section. You will need it to install the new pump.

    8. Remove the little black ring from the end of the pump and set it aside. Then remove the filter bag from the old pump.



    9. Take the filter bag and push it onto the new pump, then use that small black ring to secure it on your new pump.



    10. Slide the rubber hose onto the new pump, and secure it with the old clamps.

    11. Plug in the electrical connector.

    12. Stick your rubber O ring or whatever you have under the pump, then attach the 2 inch hose clamp. Tighten it in a way that they filter bag pipe is not pushed against the metal bracket.



    13. This is what you should have now. Make sure your filter bag is oriented as shown.



    14. Put the whole thing back into the tank, but first stop, double check your assembly, then go ahead.

    15. Re-attach the hoses, clamp them down, plug in the connector, and replace a couple bolts to hold the cover in place while you test.

    16. Double check everything, replace your gas cap if you didn't already, then put the key into the "on" position. You should hear the pump prime. Start the car and let it run while you check for leakage.

    17. If everything works, tighten down the bolts, replace the cover and trim panel, and go clean up since you probably smell like gas.

  2. #2
    Administrator Huffer's Avatar
    Join Date
    Sep 2005
    Location
    Eastlake, OH / Wellington, NZ
    Posts
    13,378
    Points
    44,297
    Level
    100
    Points: 44,297, Level: 100
    Level completed: 0%, Points required for next Level: 0
    Achievements:
    25000 Experience PointsO.G.SocialOverdrive

    Re: DIY: STi fuel pump install

    Great DIY. Very clear and easy to follow. Nice to know there's no wiring/plug issues either.
    - Roger - Site Admin
    My signature is now a shout-out to the SLi veterans who keep this site flowing with good knowledge and informative opinion. You KNOW who you are, so keep it up!
    USDM 04 LL Bean H6 Wagon - TANK
    USDM 98 GT Wagon - Pandgrish - RIP; USDM 98 GT Sedan - 216k RIP; NZDM 99 GF8 - retired
    USDM 07 Honda Odyssey - Mrs Huffer;
    Live Like No One Else - Debt Free

  3. #3
    t3h ub3r m3mber 2.5GT's Avatar
    Join Date
    Mar 2006
    Location
    Fascist state of VA
    Posts
    1,881
    Points
    12,834
    Level
    73
    Points: 12,834, Level: 73
    Level completed: 96%, Points required for next Level: 16
    Achievements:
    10000 Experience PointsO.G.

    Re: DIY: STi fuel pump install

    Very nice.

    Did the STi pump noise any louder than stock? and I'm assuming you ran the car with the pump, any difference? we'll without any force induction, it probably won't do much except dump more fuel.

  4. #4
    SLi O.G. anothernord's Avatar
    Join Date
    Sep 2008
    Location
    Ft. Collins, CO
    Posts
    2,027
    Points
    16,569
    Level
    82
    Points: 16,569, Level: 82
    Level completed: 44%, Points required for next Level: 281
    Achievements:
    10000 Experience PointsO.G.

    Re: DIY: STi fuel pump install

    It purrs just as happily as it ever has. The noise is probably due to the fact that the pump is in contact with the metal bracket, so it transmits the sound more. Its not really much louder, just a little 'whirr' when you turn the key to the "On" position. When driving there is no difference since the fuel pressure regulator controls fuel pressure for a given manifold pressure anyway.

  5. #5

  6. #6
    Guest

    Re: DIY: STi fuel pump install

    im not too sure i understand the benifit of having this..

  7. #7
    SLi Supporter chuckthefuk's Avatar
    Join Date
    Jun 2008
    Location
    Toronto, ON, Canada
    Posts
    4,530
    Points
    23,515
    Level
    94
    Points: 23,515, Level: 94
    Level completed: 17%, Points required for next Level: 835
    Achievements:
    10000 Experience PointsO.G.Recommendation Second ClassSocial
    Awards:
    Frequent Poster

    Re: DIY: STi fuel pump install

    Quote Originally Posted by Zues Marine
    im not too sure i understand the benifit of having this..
    Besides "renewing" the life of your fuel pump for peanuts. It would allow for more flow if you decide to go with a FPR and bigger injectors. But who builds N/A EJ's anyways

  8. #8
    SLi O.G. anothernord's Avatar
    Join Date
    Sep 2008
    Location
    Ft. Collins, CO
    Posts
    2,027
    Points
    16,569
    Level
    82
    Points: 16,569, Level: 82
    Level completed: 44%, Points required for next Level: 281
    Achievements:
    10000 Experience PointsO.G.

    Re: DIY: STi fuel pump install

    I can also confirm the engine now starts a lot faster. It used to take 6 or cranks to start but now it's like 3 or 4 at most. Sometime it starts immediately if it's warm.

  9. #9
    t3h ub3r m3mber 2.5GT's Avatar
    Join Date
    Mar 2006
    Location
    Fascist state of VA
    Posts
    1,881
    Points
    12,834
    Level
    73
    Points: 12,834, Level: 73
    Level completed: 96%, Points required for next Level: 16
    Achievements:
    10000 Experience PointsO.G.

    Re: DIY: STi fuel pump install

    Ever worry if that little grommet falls out?

  10. #10
    SLi Supporter DLC's Avatar
    Join Date
    Dec 2007
    Location
    Utah
    Posts
    506
    Points
    8,426
    Level
    61
    Points: 8,426, Level: 61
    Level completed: 92%, Points required for next Level: 24
    Achievements:
    5000 Experience PointsO.G.

    Re: DIY: STi fuel pump install

    I think that my 180k mile pump is on its way out. Takes a few rotations sometimes, some gas it doesn't like, and recently any acceleration below 2500 RPMs has been met with hesitation, which was sudden.

    Awesome writeup.
    March 2008 ROTM
    Legacy Central

    2001 (BH9) Legacy Outback - DD
    ---
    1997 (BG6) Legacy Outback Limited | 1998 (BK4) Legacy L | 2000 (BE6) Legacy GT Limited | 1993 (BJ) Legacy Touring Wagon | 1990 (BC) Legacy L+

  11. #11
    SLi O.G. anothernord's Avatar
    Join Date
    Sep 2008
    Location
    Ft. Collins, CO
    Posts
    2,027
    Points
    16,569
    Level
    82
    Points: 16,569, Level: 82
    Level completed: 44%, Points required for next Level: 281
    Achievements:
    10000 Experience PointsO.G.

    Re: DIY: STi fuel pump install

    Quote Originally Posted by 2.5GT
    Ever worry if that little grommet falls out?
    I thought about that, but it can't really hurt anything, and the pump wouldn't go anywhere otherwise. It would probably start making lots of noise, thereby forcing my to get all covered in gas removing the assembly to fix it.

    As a note, this was the third time I took out the whole sending unit. The first time, I dropped a screwdriver into the full tank. :smt012

    Luckily, I have a one of those remote grasper claw things. It worked great getting the screwdriver out, but was completely ruined because it will forever reek of gasoline. So when you're working on the unit, put the cover plate over the hole.

    Oh and you will lose brain cells from this mod, just plan on it.

  12. #12

  13. #13
    Administrator Huffer's Avatar
    Join Date
    Sep 2005
    Location
    Eastlake, OH / Wellington, NZ
    Posts
    13,378
    Points
    44,297
    Level
    100
    Points: 44,297, Level: 100
    Level completed: 0%, Points required for next Level: 0
    Achievements:
    25000 Experience PointsO.G.SocialOverdrive

    Re: DIY: STi fuel pump install

    One for sale, sans clippy wirey thingy, looks like a motivated seller too.
    http://forums.nasioc.com/forums/showthr ... ?t=1794986

    As for the grommet/O-ring/body spacer - it'd be a relatively simple job to wrap the pump with a bit of rubber and then clamp it, thus removing the concern for a floaty in the tank. I bet if you double strapped it there'd be even less of an issue with it coming loose.
    - Roger - Site Admin
    My signature is now a shout-out to the SLi veterans who keep this site flowing with good knowledge and informative opinion. You KNOW who you are, so keep it up!
    USDM 04 LL Bean H6 Wagon - TANK
    USDM 98 GT Wagon - Pandgrish - RIP; USDM 98 GT Sedan - 216k RIP; NZDM 99 GF8 - retired
    USDM 07 Honda Odyssey - Mrs Huffer;
    Live Like No One Else - Debt Free

  14. #14
    SLi O.G. anothernord's Avatar
    Join Date
    Sep 2008
    Location
    Ft. Collins, CO
    Posts
    2,027
    Points
    16,569
    Level
    82
    Points: 16,569, Level: 82
    Level completed: 44%, Points required for next Level: 281
    Achievements:
    10000 Experience PointsO.G.

    Re: DIY: STi fuel pump install

    Oh yeah, I forgot to point out that you must get the wiring harness with whatever pump you decide to upgrade to. The stock pump has 2 eyelet connectors that just attach to open terminals on the back of the stock pump, but the STi pump has an actual socket for its own plug/harness.

  15. #15

  16. #16
    SLi O.G. anothernord's Avatar
    Join Date
    Sep 2008
    Location
    Ft. Collins, CO
    Posts
    2,027
    Points
    16,569
    Level
    82
    Points: 16,569, Level: 82
    Level completed: 44%, Points required for next Level: 281
    Achievements:
    10000 Experience PointsO.G.

    Re: DIY: STi fuel pump install

    Quote Originally Posted by chuckthefuk
    I found a entire sending unit w/ harness for $60 from a 04' STi and I have a few questions:

    1) This DIY is for swaping the fuel pump only not the sending unit itself?

    2) Could you swap the entire send unit w/ pump

    -Chuck

    1. This is just for swapping the fuel pump.

    2. Yes, it should just drop in, just check the main electrical connector on the top of the cover to make sure its the same as yours.

  17. #17
    SLi Supporter TGX4776's Avatar
    Join Date
    Apr 2010
    Location
    Hedgesville, WV
    Posts
    1,599
    Points
    9,577
    Level
    65
    Points: 9,577, Level: 65
    Level completed: 76%, Points required for next Level: 73
    Achievements:
    5000 Experience PointsO.G.

    Re: DIY: STi fuel pump install

    Quote Originally Posted by anothernord
    My supercharger project requires that the engine get more fuel. The stock pump could produce the volume and pressure I need, but it would be at the upper limit of its ability.

    I think the fuel pump in my GT went out yesterday and there is an STI fuel pump up for sale near me.

    So if I install it the computer will automatically regulate it to work with my engine?
    2016 Mazda 6 GT

  18. #18
    SLi O.G. anothernord's Avatar
    Join Date
    Sep 2008
    Location
    Ft. Collins, CO
    Posts
    2,027
    Points
    16,569
    Level
    82
    Points: 16,569, Level: 82
    Level completed: 44%, Points required for next Level: 281
    Achievements:
    10000 Experience PointsO.G.

    Re: DIY: STi fuel pump install

    Well, the car has a fuel pressure regulator, so it would just deliver the same fuel pressure no matter what the pump, unless it sees that it needs more pressure, in the case of a turbo or supercharger. So yes, it will work just fine.

  19. #19
    SLi Supporter TGX4776's Avatar
    Join Date
    Apr 2010
    Location
    Hedgesville, WV
    Posts
    1,599
    Points
    9,577
    Level
    65
    Points: 9,577, Level: 65
    Level completed: 76%, Points required for next Level: 73
    Achievements:
    5000 Experience PointsO.G.

    Re: DIY: STi fuel pump install

    OK, thanks for the help!
    2016 Mazda 6 GT

  20. #20
    SLi Supporter Chausx's Avatar
    Join Date
    Nov 2009
    Location
    Northern Utah
    Posts
    54
    Points
    5,440
    Level
    47
    Points: 5,440, Level: 47
    Level completed: 45%, Points required for next Level: 110
    Achievements:
    O.G.5000 Experience Points
    I got my fuel pump from Nasioc for $30 shipped which is a steal of a deal. From what I've been looking around for the stock BD Legacy fuel pumps run at around 50gph(~190lph) at a free flow rate while the '05 STI pump I acquired is running at around 60gph(~227lph) a gain of ~40 lph is not a bad deal mainly for the change it costs to get one compared to a Walbro 255lph fuel pump. I'll be doing this swap into my legacy when I start doing the 3.3 swap.
    '98 Legacy GT (Back to Stock Project - her donor broke a bolt 4-13-14)
    Fuelly

  21. #21
    SLi O.G. httrdd's Avatar
    Join Date
    Sep 2009
    Location
    NEPA
    Posts
    2,700
    Points
    11,761
    Level
    71
    Points: 11,761, Level: 71
    Level completed: 28%, Points required for next Level: 289
    Achievements:
    10000 Experience PointsO.G.

    Re: DIY: STi fuel pump install

    Thanks nice diy.
    TJ

    99 LGT H6 Limited OBP

    A little bit of Wrx, a little bit of 2.5RS, a little bit of STi, a LOT of SVX!

    Will I ever supercharge this Eg33???


    Quote Originally Posted by chuckthefuk
    Cheers and the Baja is not the bastard child.. The Legacy is :-D -Chuck

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •