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In-Tank Fuel Pump DIY for $80 - Install in Pictures

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    In-Tank Fuel Pump DIY for $80 - Install in Pictures

    Fuel Pump DIY for $80 - Install in Pictures

    Car: 1991 318i 4-door. M42. All later e30s with the single in-tank fuel pump would follow the same procedure. Don't cross wires or leave exposed wires within arching distances. I take no responsibility for your actions, this is mere documentation of the process that I performed on one of my own cars.

    What is needed:
    8mm wrench or socket
    Set of screwdrivers
    Wire cutters
    Wire Strippers
    Soldering iron/gun, Solder & basic skills
    Dremel or mini grinder & basic skills
    $80
    2 hours, probably less.
















































































    Any Questions?
    ...what hasn’t been done to an m20 yet?

    m20 Oil Stencil

    #2
    +1

    Comment


      #3
      This is a very good DIY, but for those of us who get stranded, this is a good local solution.

      My pump was making death noises back in March and this is what I did when I replaced it then. I was going to go the above DIY route when I stumbled upon this.

      O'reilly's sells a direct 255lph replacement for $89, no modifying required, well minus the wires. The only problem is you have to buy a strainer, so another $10. But it's a good solution for if you're stuck on the side of the road somewhere or you need it now for the out the door price of $99

      Apparently my pump had been replaced before by this exact unit, so it was plug and play for me. The only thing required is to solder the wires to the pump for everyone else.

      Here's what I had, old on the right, new on the left.



      Everything you need comes in the box including a new o-ring for the tank




      This is what you're basically going to start with,



      Next is the wiring, mine already had it, so I just put the supplied connector on the pump





      Install the rubber base





      Slip in the rubber bushing for the top



      Finesse the rubber sleeve on for the pump, mount the unit up on the return assembly, and install the strainer. (Make sure you installed the check unit, that thing the top of the pump slips into)



      Zip tie everything back together and reinstall it with the o-ring.



      Here's the differences in the o-ring shape. Top is OEM (PN 16111744369) and bottom is the one that comes with the pump. The supplied one works, but when I received my car, my tank was leaking from it when I filled up. So I don't think it's the best long term solution, but it will get you by till you can order or find the right o-ring.

      Comment


        #4
        i have a question.

        what does that check unit thing even do? is it necessary?because i removed mine when I installed my 255lph

        Turbo M42 Build Thread :Here
        Ig:ryno_pzk
        I like the tuna here.
        Originally posted by lambo
        Buttchug. The official poster child of r3v.

        Comment


          #5
          keeps the fuel pressure when you switch the car off.
          Build Threads:
          Pamela/Bella/Betty/325ix/5-Lug Seta/S60R/Miata ITB/Miata Turbo/Miata VVT/951/325xi-6

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