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How to remove fuel fitting on nylon gas lines

Discussion in '"Stock" Alpine' started by sunalp, Nov 28, 2020.

  1. sunalp

    sunalp Platinum Level Sponsor

    I know, sounds like a silly question and usually I can get around this issue, but this car I'm
    working on is special. It's a one owner car purchased new in London ( as an export model)
    in 1968 and has remained with the family since. It has 38K original miles.

    I cleaned and sealed the gas tanks and the crossover tubes . Used new rubber and clamps.
    The owner was having the common stalling issues with paint flakes clogging the jets.
    The car has its original nylon gas lines with the original nuts. They take a 7/16 wrench but
    don't seem to loosen. If I keep turning it starts to twist the lines so I'm asking if anyone has
    successfully removed them and retained the nylon lines? This car is very special and original
    and I'd like it to stay that way. I only want to remove them to blow any remaining paint out
    of the lines. Don't want to unnecessarily break them.

    Any ideas are truly welcome!
    Cheers!
    Steve
     
  2. DanR

    DanR Diamond Level Sponsor

    Steve, Just left you a message to your phone.

    If you are speaking about the line connection at the crossover tube, I sometimes have had to put pressure on the plastic line by pulling a bit to relieve tension on the nut as you loosen it.

    The "flap" that protects the fuel line doesn't allow much flexibility to connect or disconnect the line. I have also "opened" slightly the flap a bit allowing me to work the nut..........
     
  3. volvoguys

    volvoguys Diamond Level Sponsor

    Assuming you are trying to remove the fitting/olive at the center tube, I'll build on what Dan has offered: I've broken a lot of these cars and find the fuel line so difficult to remove I usually cut it off. I suspect that over 50+ years the nylon has somewhat vulcanized and is more likely to crack or break that flex off the inlet tube.

    You might consider using a heat gun to soften the line enough it'll come off. I suspect that might distort it so upon reattaching you might need to again soften the line and massage it for a tight fit once its on.
     
  4. sunalp

    sunalp Platinum Level Sponsor

    Thanks Dan & Mark,
    The center connection on the crossover tube is just a normal compression fitting, no problem with that.
    The same goes for the line in on the fuel pump. It's the fitting on the line out from the pump where I'm
    having the issue. It's not a normal compression fitting. It's a brass nut that has the nylon line inserted
    and by tightening the nut it somehow seals the line. There's no olive in there. Never seen these before
    and already destroyed the one to the carbs. I fixed that one by inserting the nylon line into rubber gas line
    and clamped both ends. Perhaps that's the only way to get these off?
    I'll take a picture of this and post in a short while so maybe a visual will help.
    Thanks again guys, really appreciate it....Dan I'll give you a call later this morning.

    Cheers!
    Steve
     
  5. sunalp

    sunalp Platinum Level Sponsor

    Here are a couple pics of the offending fastener.
    Cheers!
    Steve

    IMG_1513.JPG IMG_1514.JPG
     
  6. DanR

    DanR Diamond Level Sponsor

    I would use the new plastic gas line and replace it all trying to keep the nut(fitting).

    I have replaced the old with new black plastic lines on my Alpines.

    Bet you can too!
     
  7. sunalp

    sunalp Platinum Level Sponsor

    Thanks Dan,
    I'll try and find some line tomorrow. I do think it's the way to go.
    Cheers!
    Steve
     
  8. hartmandm

    hartmandm Moderator Platinum Level Sponsor

    Here are photos that I believe are the original parts at the carb end. From what I can tell, the threads in the nut bite onto and then compress the fuel line onto the metal pipe. The fuel pump end could be the same setup, but I have never loosened that end.

    Mike

    upload_2020-11-30_20-52-56.png

    upload_2020-11-30_20-54-7.png
     
  9. sunalp

    sunalp Platinum Level Sponsor

    Thanks Mike,
    That's the end I destroyed as it just twists the nylon and doesn't really loosen. I wonder if I can get
    the old nylon out of the "nut" if it'll work with the new nylon? Something else to try today!

    Thanks to Dan R and his suggestion for new nylon lines. I was able to buy it ( 5/16ths ) at a local
    NAPA and it works really well. Not cheap though, 25 ft cost $50.

    I'll post back and let you know if the "nuts" can be reused.
    Cheers!
    Steve
     
  10. sunalp

    sunalp Platinum Level Sponsor

    Well, I have attached the nylon furl line from the fuel out on the pump to the T on the carbs with
    the "nuts" removed from the original line. So far, they are tight and won't pull off. I'm off to
    put some gas in the tanks and see if anything leaks. I'll post pictures later on.
    Thanks again for everyones help!
    Cheers!
    Steve
     
  11. sunalp

    sunalp Platinum Level Sponsor

    OK, car running with nice new cleaned and sealed tanks, all new gas line . The line running from the pump out to the carbs
    is using the "stock" nuts that I removed from the old line. They're on there and there are no leaks.

    Going for a long test drive this afternoon if the weather holds and we'll see if there are any leaks.
    I don't think there will be as everything is tight and the tanks are firmly installed.

    Here are a couple of shots of the lines with the nuts installed.

    Cheers!
    Steve

    IMG_1515.JPG IMG_1517.JPG IMG_1518.JPG
     
  12. hartmandm

    hartmandm Moderator Platinum Level Sponsor

    Steve,

    Was the same type of nut that is at the fuel tee (carb end) also used at the fuel pump end?

    Thanks,
    Mike
     

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