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what is the correct height of the modified filler neck, and what is the vent pipe’s new location????
Hi DENNIS, I put a new tank in last year and had the neck cut down as far as possible. Of course, the vent tube is eliminated. The VW’s cap is unvented, of course. I followed my shops advice and drilled a very small hole (1/8”) in the top of the gas cap so air can bypass the seal and I also leave the tank about three or 4 inches low. (I always carry a small flashlight). I’ve never had a problem doing this.
However, you can purchase a kit intended for a trials motorcycle or ATV’s that includes a fitting you could attach on the gas cap or even the top of the tank. It may be possible, room permitting, installing into the neck. Good luck with your lifelong project! Greggthank you Gregg and yes it is a life long project. i am only worrrrrrking on the tdr for 16 years and my bgt for only 22. did you puncture the rubber bladder also ? i had “finished’ my tdr , until feral cats got in my shed and destroyed the car.
Good evening Dennis. I live in NE Ohio and my FF TD is in NW Ohio with almost two hours separating us! Regarding your question about the gas cap seal – I think I did to allow air to pass. I’m going to bring the car home this weekend if the weather is good. We had snow on the ground this am and it is supposed to hit 80 Thursday – I love living in place that keeps me guessing! Anyway, I’ll take a good look at the cap and get back to you regarding my vent. I had the car painted last fall and I’m bringing it home so I can get it back together. We are planning to go to Carlisle next month and I’m not even close. I’ve had my car about 8 years and when I bought it, only the brake lights worked and the engine threw a rod 2 weeks later! Fortunately, I enjoy wiring. The car had 5 fuses and no relays and now it has 12 fuses and 14 relays! All the instruments were damaged and most of the switches were burnt. Had a new engine built, did the interior twice, new top, put real seats in, 3 point belts, front disk brakes, new dash with new instruments and finally solved the overheating issue. Life is good – not fair, but good!
<p style=”text-align: justify;”>Dennis, Check the media under my name for a pic of the newly vented gas cap. I forgot how to post photos in the general forum. The other side of the drilled hole is just inside of the seal gasket and is open to the tank above the internal construction of the cap. I’ve reread your original question and if you are still looking for instructions for the modification of the tank, you’ll find on this sites, an assembly manual in the library for a Fiberfab VW the gives specifications.
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