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    318is Gas Tank

    I have a 1991 318is, and I need to replace my fuel tank, and most of the parts parts websites say tank "A" fits the 318i, but not the 318is...

    Aside from # of doors & rear end I thought the two were identical? Does the 318i have the larger tank?

    Has anyone ever put the larger 325 tank in your 318is? Anything special required?
    1991 318is --- currently not road worthy
    1991 318i ---- 308K - retired

    Originally posted by RickSloan
    so if you didnt get it like that did you glue fuzzy oil to the entire thing?

    #2
    Probably means tank "A" fits the early ('84-'85) M10 318i, not the later M42 318is (and i).

    The biggest difference from the 325 tank is the fuel return circuit. The 325 return goes into the left side of the tank and through the siphon in the tank to the right side. The 318is return goes to the pump hanger on the right side and fuel moves between the 2 halves via the tube at the bottom of the tank. There's also the difference of 2 vs 1 fuel level sensors.

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      #3
      I can confirm that the sedan 318i (M42), and 318is (M42) tanks are the same for US models.

      Vpilarrt got the rest dead on as usual.
      Last edited by roguetoaster; 11-18-2017, 07:04 AM.

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        #4
        Originally posted by roguetoaster View Post
        I can confirm that the 318i (M42), and 318is (M42) tanks are the same for US models.

        Vpilarrt got the rest dead on as usual.
        Not all m42 cars use the same tank. The 318ic uses the larger one found in the 325i, which threw me off when i found one in a junkyard. Not sure if they're identical but I believe the part numbers were the same per realoem.
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          #5
          Interesting, I was only referencing the sedans and coupes, will revise.

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            #6
            I have an aftermarket tank for a 91 318is i bought a long time ago and never installed. I'll take some pics later if that helps

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              #7
              I once used a fuel tank from a 91 318i in a 88 325is,so you never know
              NASA
              BMWCCA member
              PCA member 25yrs




              1991 318IS slick top
              1997 M3 sedan
              2001 325CI DD

              “whoever turns the wheel the least, wins"

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                #8
                Originally posted by e30s50dan View Post
                I once used a fuel tank from a 91 318i in a 88 325is,so you never know
                They'll fit any E30. I know when putting an M42 tank in an M10 car we had to really "massage" the passenger side to remove a bracket and protrusion.

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                  #9
                  91 318is gas tank
                  Attached Files

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