Palantirion

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An update: For the past week I had the car's vent tube plugged and the (non vented) gas cap cracked ever so slightly. It took a while to properly blow out the old gas fumes but since then there has been no increase in vent fumes. While Ntenna's description is likely what happened during installation, and I would like to properly affix the vent tube internally so it would operate like stock, I have too much else going on to spend time doing that right now - if it can be put off. I rarely drive the car. Does anyone see a problem with me keeping the vent tube plugged and just using the cracked gas cap as a pseudo-vented-cap until such time as I can relocate the peak of the vent tube?

- Not having x-ray vision I cannot confirm exactly how the hose ran within the c pillar. But once I got it bent back through both holes I fed it evenly so that all the length from my first page pics was up in the c pillar - save for the 2-3' needed to go from the c pillar through the floor. http://aoai.org/forums/uploads/monthly_2021_05/1784714215_2104-28newfueltankventtube(2)_72.jpg.856ef74392fbde9538dd37205c45e5e1.jpg http://aoai.org/forums/uploads/monthly_2021_05/479298818_2105-12venttubeoncoathook_72.thumb.jpg.72cefee94d7c093fae5844f88a9161fb.jpg I felt no resistance while feeding the hose up, didn't hit anything like a clip or snag, so I am fairly confident that it stayed vertical. But I can't know for sure. I was thinking that maybe it is possible that another 2-3' (which I could add with a barb fitting) might help push the peak of the hose higher. But without being able to mechanically secure it within the c pillar it might also make it more prone to bending which might defeat the purpose. Going from my memory of removing the old hose I believe my replacement is actually a little bit longer. What puzzles me is why, with the car just sitting and the warehouse kept at 75F (+/-2), there is still pressure being build up within the tank. Can someone explain why this would occur? AND why it didn't occur prior to me opening the tank to replace the sending unit and the vent hose.

- Because of the tight space I was working in I never got a picture of what was up inside the two lower holes. But I could feel with my finger something like a plate a couple inches above the holes. It felt like a small plate, I didn't feel holes, and now I wonder about "running changes". Regardless, I had to bend my wire-string-hose apparatus over that plate because it wouldn't bend under it. And, from the length of the hose I pushed up into that space I'm sure it's plenty high. p.s. I have a borescope. I remember this now. Would have been nice to have remembered it then.

- Exactly! It would have to be positive pressure. The vent line's primary purpose is to allow air into the tank to fill the displacement of fuel leaving the tank.

- According to what I have read (and experienced) gas vapor is heavier than air. Thus is could not go up the filler neck unless the tank experienced pressurization.

- I buttoned the back up because of a show, but it's easy enough to pull the rear seat and bulkhead again. I like your idea for diagnosing. I do NOT like that you said there are 4 holes that the hose needs to pass through...makes me wonder how high the other two are and if my hose went up to that area and then got turned around a few inches too low. You wouldn't by chance have a picture or diagram of the layout would you? FYI, I did try something a couple weeks ago...I removed my (non-vented) gas cap and then blew through the vent tube to clear any vapor, then I left the cap off overnight. The next day my warehouse stunk SO much more than before. And that confused me because the vapor shouldn't be able to push up through the filler neck, right?

Thanks!

- I had thought about that, but two points that puzzle me: 1) The car is kept in a air conditioned warehouse (max 75F) and yet the vent still expels fuel vapor. The only differential would be from the temp dropping at night, rarely below 60F. 2) The car did not used to make gas smell. Not until the original vent tube started weeping fuel, which was then smelling inside the car. I was not getting fuel vapor from the original vent tube with the car in the same condition and space. Come to think of it, I didn't get any fuel vapor smell even year ago when the car was in a garage with a much wider temperature swing.

Aaaaaand we're back. I ran the new vent tube through the same hole as the original. The gas smell never quite went away. First I thought to blow out my shop to ensure no previous vapor was hanging around. Then I thought maybe there was something within the fuel system that might change after the car was run so I took it to a local show and back. I had it on my rack today after noticing the faint smell of gas vapor and vapor is definitely being pushed out through the vent tube. There was no dripping that I could see, but there is enough vapor to build up to visible moisture. Why is this happening? I am considering using a 1-way ball check valve to prevent gas from escaping the vent tube while still allowing it to draw in air. But I wonder if there might be any negative consequences if the tank can't push vapor pressure out (except through the fuel lines) if it's outside on a hot day.

I was under my '64 Avanti today looking for potential rattles and leaks and noticed that the washer on this stud was completely loose. It seems to me that this is part of the parking brake assembly and that the nut and washer should be snugged up to the front end of the bracket to keep the wires tensioned correctly. Am I wrong?

For those (like me most of the time) that think kids these days don't care about working on cars...well, most of the time they'd be right. But there are exceptions: A front desk kid at a local BMW shop (where I was having some other work done) suggested that I drill a hole through the tube and use string to guide it around the internals. He was on to something. I ended up having to use a long twist tie to curve around whatever is inside that panel and then used that to pull the string which then pulled the tube successfully through both holes! It took a bit of futzing to get the right degree of tension on the tube to make it line up and pass through the 2nd hole, but overall it was not a nightmare. Kudos to those of the new car guy generation.

*SOLVED* 😣 Using a Dremel I was able to cut out the panel between the two holes for the OEM vent tube, and eventually (rotating locking pliers against the panel for torque) I removed the hidden length of the original tube. It was nearly 2' long! Unfortunately I can't simply push the new tube up the gap because there is a second plate behind the panel I just cut, between the two holes. I can't see it, because of the tiny space, but I think it's fiberglass. I also am not sure if I should cut it - but it will be much more difficult because of the size of my cutoff wheel and the tight space. I was thinking of maybe trying to use thick armature wire as a guide to maybe force the new hose into turning inside the panel so I can run it like the stock hose. Does anyone know a good trick to make a rubber hose turn 180 degrees in a blind inaccessible cavity? p.s. My gas cap is not vented, I checked: Blew into the vent tube with the cap on - blew gas vapor back at me. With the cap off it did not.

Got a link to one I could buy that would fit the hose? Or...what about using a check ball valve like this one? https://www.amazon.com/gp/product/B08PSYF3GZ/ref=ox_sc_saved_title_1?smid=A1THAZDOWP300U&psc=1