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Fuel leak at the top of the fuel tank when tank is full

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    Fuel leak at the top of the fuel tank when tank is full

    My friend and I have both own a 1988 323 gt. On separate occasions we filled our gas tank at the gas station, only to discover that that the gas is overflowing @ the top of the hanger assembly. When I checked mine i found that the fuel tank lock ring wasn't damage from a visual inspection, but it was still leaking from the top. Could it be that the fuel tank lock ring has become harden and unable to prevent the fuel from leaking at the top?
    Last edited by mazkam; 03-10-2010, 03:28 PM.

    #2
    No, it's because the tank is plastic and the ring is metal. (almost all mazdas and fords that have this setup and are located in wet or snowy climates have this problem.) The ring rusts and partly seperates from the plastic tank, because plastic doesn't rust. That's what causes the leak. You pretty much need a new fuel tank. I haven't found a way to fix it..... this has happened to every escort and protege I have owned.
    My family has lots of bg's!
    2003 Ford Escort ZX2: Project car/future daily driver. Built Ford Tough (With Mazda Stuff)
    1999 Escort ZX2: Daily driver/beater. Going to be replaced by the '03 next summer.
    2000 Escort ZX2 S/R: bought wrecked, going to use as parts car
    1992 Protege LX: My old race car. Just a wrecked shell right now. Waiting for scrap to go up so that I can get rid of it.
    1992 Mazda 323: Race car
    1992 Escort Gt: My grandpa's old race car
    1994 Escort GT: My grandpa's new race car.
    Parts cars; 1993 Escort Gt, 1995 Escort lx

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      #3
      Originally posted by Racerboy View Post
      No, it's because the tank is plastic and the ring is metal. (almost all mazdas and fords that have this setup and are located in wet or snowy climates have this problem.) The ring rusts and partly seperates from the plastic tank, because plastic doesn't rust. That's what causes the leak. You pretty much need a new fuel tank. I haven't found a way to fix it..... this has happened to every escort and protege I have owned.
      Good info! I need to watch out for this on some of my Mazdas!

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        #4
        The fuel tank on my car is metal.

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          #5
          All 323 GT's, and GTX's are steel tanks. Your FI sending unit should have a number of screws holding it to the tank. Under the top plate of the sending unit is a rubber gasket that fits between the sending unit and the tank. After many years, they will start to crack and dry out. At this point its best to replace it. I bought a new one at my dealer for like $17. Its not hard to replace either. Hope that helps.
          Mazda
          1988 Black 323 GT
          DOHC 16 VALVE TURBO

          2013 Velocity Red Mica Mazdaspeed3

          Comment


            #6
            Originally posted by FamiliaGT View Post
            All 323 GT's, and GTX's are steel tanks. Your FI sending unit should have a number of screws holding it to the tank. Under the top plate of the sending unit is a rubber gasket that fits between the sending unit and the tank. After many years, they will start to crack and dry out. At this point its best to replace it. I bought a new one at my dealer for like $17. Its not hard to replace either. Hope that helps.
            Oh, ok. I just assumed that it was the same with these cars.

            I wish our tanks are all metal. Ours are a VERY stupid design.....
            My family has lots of bg's!
            2003 Ford Escort ZX2: Project car/future daily driver. Built Ford Tough (With Mazda Stuff)
            1999 Escort ZX2: Daily driver/beater. Going to be replaced by the '03 next summer.
            2000 Escort ZX2 S/R: bought wrecked, going to use as parts car
            1992 Protege LX: My old race car. Just a wrecked shell right now. Waiting for scrap to go up so that I can get rid of it.
            1992 Mazda 323: Race car
            1992 Escort Gt: My grandpa's old race car
            1994 Escort GT: My grandpa's new race car.
            Parts cars; 1993 Escort Gt, 1995 Escort lx

            Comment


              #7
              Actually, come to think of it, my SE 323 has the same fuel tank too. Maybe its Carbed 323's that have plastic tanks? I dont know.
              Mazda
              1988 Black 323 GT
              DOHC 16 VALVE TURBO

              2013 Velocity Red Mica Mazdaspeed3

              Comment


                #8
                hmm, my gas tank is metal as well.


                '88 323 sedan, K-swapped..

                '03.5 Mazdaspeed Protege - miss it so much..

                '01 Dodge Ram 3500 Cummins - 323 hauler

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