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Thread: Fuel system - Inline efi pump questions

  1. #1
    Senior Member Futo_gt86's Avatar
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    Default Fuel system - Inline efi pump questions


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    Car - AE71 Panel Van

    motor / part in question - Blacktop 4AGE

    problem - Fuel system

    occurs/started when (if applicable)- Vehicle fuel system has been stripped / gutted

    personal situation (if applicable)-


    Hi,
    So have an interesting one here, below pictured is the AE71 Panel van fuel tank with custom fab'd swirlpot welded into the tank.
    This is what I'm working with.
    Click image for larger version. 

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    I got in contact with the previous owner and he told me about the fuel system setup and sent me these pictures.
    Click image for larger version. 

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    Was feeding ST20V turbo motor.
    Click image for larger version. 

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    1/2" line, single Bosch motorsport pump.
    Previous owner stated that with this setup he never had any surge and that it worked great, never had a problem.

    Now, my issue...I believe he means it to be a Bosch 044 pump yeah...
    I have contacted many suppliers, and I received the same response, that an 044 requires a primary pump to feed it, usually a intank lift pump, and not to be used as a standalone pump. There is no intank pump in my setup, as in, there is no option for intank.

    In my research I have read many forum posts about Bosch 044 pumps.
    Most stuff i read said that these are pusher pumps, run inline after a primary intake pump, and that you shouldn't run a filter before them, as that can cause issue with the feed.

    I'm guessing that he got away with it as gravity feed was enough to feed that 044.
    Do you think I will get away with the same kind of set up that was run originally? (Just not with 1/2" fuel line of course)

    Or, is there a bosch "motorsport" pump, I can purchase that is a "puller" type pump. (coz if there is, I'm having difficulties finding it). Really, doesn't have to be Bosch, just a decent brand, but needs to be screw in type fittings style.

    Any help here would be much appreciated.

    Thanks,
    Ali
    Last edited by Futo_gt86; 12th February 2018 at 06:31 PM.

  • #2
    Senior Member Futo_gt86's Avatar
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    Looks like I will be going with a Walbro GSL392? external in line.
    Any one here running one of these, or has previously?
    Let me know what your experience was...

  • #3
    Senior Member Futo_gt86's Avatar
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    Found some interesting info here about bosch 044 and walbro pumps (references Walbro intank, but internal design is the same as external)
    https://www.aftermarketindustries.com.au/blog/blogart26

    Found Walbro site, GSL392 is overkill for stock 4AGE balcktop, GSL393 150 LPM will do for my set up.
    http://walbrofuelpumps.com/walbro-gs...ine-fuel-pumps

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    I have ran a bosch 044 in my car without a lift pump, and i was getting surge at about 1/4 of a tank... Many others have ran them with a lift pump in tank without issues.

    There are models of Walbro that fit through the tank without issues. Its a tiny in diameter but capable of 200+L an hour. To fit the pump, you basically cut the pipe off the fuel hanger, and add the efi pump so it sits at the bottom of the tank. Use a clamp off air intake piping to hold the pump in place.
    Last edited by Matt; 15th February 2018 at 07:58 PM.
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    Senior Member Futo_gt86's Avatar
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    Cheers for the info Matt, I get what you mean with the intank mod, but I went ahead already and bought a in line Walbro.
    I'm now in the throws of getting all the hose, fittings and filters organized.
    Don't suppose you would know what size/thread the fuel rail inlet is on a AE111 blacktop motor?
    Click image for larger version. 

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    I read off here that a bigport is 12x1.25 - seems big to me
    Got info from here:
    http://www.ae86drivingclub.com.au/fo...fuel-rail-size
    Can't find what i'm looking for off blacktop....
    **Found a Bigport rail and tested BT20V banjo fitting - screwed straight in, so are the same**
    **Tested 12x1.25 fitting - male and fits perfectly**
    Last edited by Futo_gt86; 28th February 2018 at 06:29 PM. Reason: update

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    Veteran LittleRedSpirit's Avatar
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    Just get thread pitch gauge like all people do and measure it. If you dont have calipers too youll find it hard to match any size on a car. Be more reliable than internet wisdom too.






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    Veteran LittleRedSpirit's Avatar
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    Id be worried about getting too hektic and wiping the swirl pot off the bottom of the tank if it was me. Its right in the departure angles radius.






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    Senior Member Futo_gt86's Avatar
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    Quote Originally Posted by LittleRedSpirit View Post
    Just get thread pitch gauge like all people do and measure it. If you dont have calipers too youll find it hard to match any size on a car. Be more reliable than internet wisdom too.
    Yeah funny you said that, I been using one of them gauges I found in a thread and die kit the other day to work out what fittings I need.
    Yep, got digital vernier also.

    Quote Originally Posted by LittleRedSpirit View Post
    Id be worried about getting too hektic and wiping the swirl pot off the bottom of the tank if it was me. Its right in the departure angles radius.
    Thats a valid point, and I will take that into consideration.
    It will make do for now just to get car running.

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