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Fuel penetrating under the tank paint

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    #1

    Fuel penetrating under the tank paint

    The paint job on the fuel tank of my GSX750ES was recently done with awesome finish. The reliability however sucks.
    As you can see in the attached picture fuel is penetrating under the paint and it can be easily peeled off close to the fuel cap.

    1. Can the problem be fixed locally or a whole re paint of the tank will be needed ?
    2. What can the paint shop do to prevent such problems in the future ?
    Tags: None
    #2
    looks to me like the problem was caused by the fuel cap not sealing properly.Youll need a new rubber seal. As for the paint, its past the point of being able to hide it under the cap. If it were me i would have the whole tank repainted.
    MY BIKES..1977 GS 750 B, 1978 GS 1000 C (X2)
    1978 GS 1000 E, 1979 GS 1000 S, 1973 Yamaha TX 750, 1977 Kawasaki KZ 650B1, 1975 Honda GL1000 Goldwing, 1983 CB 650SC Nighthawk, 1972 Honda CB 350K4, 74 Honda CB550

    NEVER SNEAK UP ON A SLEEPING DOG..NOT EVEN YOUR OWN.


    I would rather trust my bike to a "QUACK" that KNOWS how to fix it rather than a book worm that THINKS HE KNOWS how to fix it.

    Comment

      #3
      I agree with Chuck. Since fuel has found its way under the paint, a void has been made between it and the metal that will most likely get larger.

      Comment

        #4
        If it had been just a small spot that would be hid by the cap, I would have popped the blister and picked off any loose edges. Then took some white paint and just repainted the offending spot, but thats too far gone. What you can do in the future once its repainted is this.. go buy a spray can of clearcoat and spray some in a cup. Take a Q Tip and apply sevral layers around the filler cap all the way up to the rim that the cap seals against and let it dry out in the hot sun for a day or 2. that will assure that all the edges between the filler neck and fresh paint are sealed well. thats probably where the whole thing started..right where the paint stopped on the filler neck.
        Last edited by chuck hahn; 03-06-2011, 09:51 AM.
        MY BIKES..1977 GS 750 B, 1978 GS 1000 C (X2)
        1978 GS 1000 E, 1979 GS 1000 S, 1973 Yamaha TX 750, 1977 Kawasaki KZ 650B1, 1975 Honda GL1000 Goldwing, 1983 CB 650SC Nighthawk, 1972 Honda CB 350K4, 74 Honda CB550

        NEVER SNEAK UP ON A SLEEPING DOG..NOT EVEN YOUR OWN.


        I would rather trust my bike to a "QUACK" that KNOWS how to fix it rather than a book worm that THINKS HE KNOWS how to fix it.

        Comment

          #5
          Rubber seal for the fuel tank is not sold separately.
          I guess I need to replace the whole cap ...

          Comment

            #6
            Put an add in the wanted parts section..someone has a seal and its not hard to replace.Just gently lift the seal off all the way around the bottom and the new one slips right back on...someone will have one. Be sure to include the year and model of the bike as well.
            MY BIKES..1977 GS 750 B, 1978 GS 1000 C (X2)
            1978 GS 1000 E, 1979 GS 1000 S, 1973 Yamaha TX 750, 1977 Kawasaki KZ 650B1, 1975 Honda GL1000 Goldwing, 1983 CB 650SC Nighthawk, 1972 Honda CB 350K4, 74 Honda CB550

            NEVER SNEAK UP ON A SLEEPING DOG..NOT EVEN YOUR OWN.


            I would rather trust my bike to a "QUACK" that KNOWS how to fix it rather than a book worm that THINKS HE KNOWS how to fix it.

            Comment

              #7
              Hate to say this but getting a fuel cap for that will be fairly hard.They seem fragile.Got a bunch of requests for that style cap when I put my 83 parts up.

              I only have this one and the key does not lock it.Look great but they seem to be a PITA.

              Comment

                #8
                Sadly, it's a very common problem. Wherever there is a hard paint edge, especially around the filler, you have to seal it off. I've used Liquid Steel with good success. Mix the 2-part up then take your finger and smooth a thin coat over that exposed edge. The Liquid Steel is hard as rock in 15 minutes and is impervious to the gas. Liquid Steel is sandable, too, so if you need to smooth it out for a tight seal, it's possible to do so, but don't sand so much off that it re-exposes the paint edge. It's also a good idea to do it where the paint edge goes around the petcock threads, too. Today's gas eats right into exposed paint edges. Unfortunately, the damage has already been done to your tank. A good painter should be able to touch that area up, and then re-clear the whole tank again.
                1979 GS1000S,

                1982 Honda CX500 Turbo, 1982 Honda MB5 w/CR80 motor, 1977 Honda "nekid" Goldwing, 1976 Honda CB550F cafe', 1972 Honda XL250 cafe'

                Comment

                  #9
                  I would have it all redone..too many variables to get it right..feathering, sunfade..just worth the full redoing to be assured a quality and uniform job ..in my opinion.
                  MY BIKES..1977 GS 750 B, 1978 GS 1000 C (X2)
                  1978 GS 1000 E, 1979 GS 1000 S, 1973 Yamaha TX 750, 1977 Kawasaki KZ 650B1, 1975 Honda GL1000 Goldwing, 1983 CB 650SC Nighthawk, 1972 Honda CB 350K4, 74 Honda CB550

                  NEVER SNEAK UP ON A SLEEPING DOG..NOT EVEN YOUR OWN.


                  I would rather trust my bike to a "QUACK" that KNOWS how to fix it rather than a book worm that THINKS HE KNOWS how to fix it.

                  Comment

                    #10
                    Originally posted by chuck hahn View Post
                    I would have it all redone..too many variables to get it right..feathering, sunfade..just worth the full redoing to be assured a quality and uniform job ..in my opinion.
                    I would agree with that, except the tank decals are already in place. You could save time and money by not having to redo those, too. There shouldn't be any sun fade with such a recent paint job. After scuffing the whole tank with 600, feather back the damaged area with 400, lightly prime, lightly sand the primer, blend the white in just on the top of the tank, then re-clear the whole thing again. Any painter worth his salt should be able to do that easily.
                    1979 GS1000S,

                    1982 Honda CX500 Turbo, 1982 Honda MB5 w/CR80 motor, 1977 Honda "nekid" Goldwing, 1976 Honda CB550F cafe', 1972 Honda XL250 cafe'

                    Comment

                      #11
                      Any painter worth his salt wouldnt have made the mistakes on that tank. I didnt see that he infact did say it was recently painted.
                      MY BIKES..1977 GS 750 B, 1978 GS 1000 C (X2)
                      1978 GS 1000 E, 1979 GS 1000 S, 1973 Yamaha TX 750, 1977 Kawasaki KZ 650B1, 1975 Honda GL1000 Goldwing, 1983 CB 650SC Nighthawk, 1972 Honda CB 350K4, 74 Honda CB550

                      NEVER SNEAK UP ON A SLEEPING DOG..NOT EVEN YOUR OWN.


                      I would rather trust my bike to a "QUACK" that KNOWS how to fix it rather than a book worm that THINKS HE KNOWS how to fix it.

                      Comment

                        #12
                        Um..first line of his post. Not here to argue, just trying to help. If the guy wasn't a motorcycle painter, specifically, then he might not have known about the penchant for peeling at the filler opening. Can't say..don't know the guy, or his skill level. I know what fixes it, though...
                        1979 GS1000S,

                        1982 Honda CX500 Turbo, 1982 Honda MB5 w/CR80 motor, 1977 Honda "nekid" Goldwing, 1976 Honda CB550F cafe', 1972 Honda XL250 cafe'

                        Comment

                          #13
                          a new paint job and money?????
                          MY BIKES..1977 GS 750 B, 1978 GS 1000 C (X2)
                          1978 GS 1000 E, 1979 GS 1000 S, 1973 Yamaha TX 750, 1977 Kawasaki KZ 650B1, 1975 Honda GL1000 Goldwing, 1983 CB 650SC Nighthawk, 1972 Honda CB 350K4, 74 Honda CB550

                          NEVER SNEAK UP ON A SLEEPING DOG..NOT EVEN YOUR OWN.


                          I would rather trust my bike to a "QUACK" that KNOWS how to fix it rather than a book worm that THINKS HE KNOWS how to fix it.

                          Comment

                            #14
                            ..in some cases, sure. Maybe the guy that painted it will honor the repair. I would if it had been my mistake..and you can be darn sure, I'd want to do it as quickly, and with as few materials as possible. It's a good lesson if nothing else.
                            1979 GS1000S,

                            1982 Honda CX500 Turbo, 1982 Honda MB5 w/CR80 motor, 1977 Honda "nekid" Goldwing, 1976 Honda CB550F cafe', 1972 Honda XL250 cafe'

                            Comment

                              #15
                              keep us posted on this..i know i am curiuos as to what he says about it all.
                              MY BIKES..1977 GS 750 B, 1978 GS 1000 C (X2)
                              1978 GS 1000 E, 1979 GS 1000 S, 1973 Yamaha TX 750, 1977 Kawasaki KZ 650B1, 1975 Honda GL1000 Goldwing, 1983 CB 650SC Nighthawk, 1972 Honda CB 350K4, 74 Honda CB550

                              NEVER SNEAK UP ON A SLEEPING DOG..NOT EVEN YOUR OWN.


                              I would rather trust my bike to a "QUACK" that KNOWS how to fix it rather than a book worm that THINKS HE KNOWS how to fix it.

                              Comment

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