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Good test... interesting results. Maybe VW didnt worry about it too much as they were seldom left soaking in the gas... only when the tank was full (or beyond) and other than that they only were exposed to fumes. I like the warm and fuzzy the repro C gives though.... whoda thunk it! a repro better than the original in the VW world! Keith Keith Park Top Notch Restorations topnotch@nycap.rr.com 71 Squareback 65 Notchback 65 Squareback 87 Golf 88 Rx7 10th Anniversary hoses from various sources. These > were used in all type 3s from 68 thru 73. There are 2 versions: early (A), 68 > thru mid 72, and late (C), mid 72 thru 73. The changeover occurred when the gas > cap went from the 1/4 turn cap to the screw cap. Unfortunately, this part > cracks and leaks gasoline fairly regularly, and these often need to be > replaced. > > Some of the hoses I had were supposed to be OEM, some reproductions. Once I had > them in hand, I could tell that even some of the ones that I thought were going > to be OEM were actually reproductions. > > Since one of the problems with rubber parts like this is that the maker might > have chosen the rubber compound poorly, I decided to run a simple test to make > sure that these were made from a compound which was compatible with petroleum > products. All I did, was place 4 different overflow hoses in kerosene for a > week. I used kerosene rather than gasoline because it is safer and I had it on > hand; the effect of gasoline would be the same or worse. > > The results surprised me. Here are the results: > > 1) NOS VW 311 201 179A, appears to be genuine, since it has the same maker's > logo on it, in addition to the VW logo and part #. Failed, absorbed the > kerosene and ballooned up to twice normal diameter. > > 2) New part, marked 311 201 179B (not a real VW number.) Failed, same as # 1 > above. This part came from ISP West; I emailed them about the odd part # but > got no reply. I have no way of knowing who actually made this part, but if > someone sells you a part with this odd part # on it you should just return it > for a refund and let them know why. I'll email them again. > > 3) New reproduction part from type 3 Konny in Germany, marked 311 201 179C, no > VW logo, different mold mark. Passed, no effect on the rubber. > > 4) Old used (genuine?) VW part from one of my cars, marked 311 201 179A. This > part had clearly shrunk in service and was SMALLER than normal at the beginning > of the test. At the end ofthetestitwasbacktonormalsize.Igavethisone > a pass, with a question mark. I'm concerned that it may have swollen up when > new, but that the gas leached out some component that left it shrunken. Thus it > swelled up only a limited amount when re-exposed. > > I will post a photo in a day or so. > > I have some more hoses in the kerosene right now, just to check to see how > widespread this problem is. I'm very concerned that one of the hoses that > failed appears to be genuine OEM from VW. It's quite possible that even VW got > careless about this in the later years, and that all my, and everyone else's, > OEM spares are poor quality. It is just as likely that this part is actually > NOT genuine VW, but just a visually good counterfeit. > > -- > Jim Adney > jadney@vwtype3.org > Madison, WI 53711-3054 > USA > > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ > List info at http://www.vwtype3.org/list | mailto:gregm@vwtype3.org > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ > >