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Patton fuel injection - nylon fuel line installation

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  • Patton fuel injection - nylon fuel line installation

    After making the decision to install Patton's fuel injection setup I started looking at what options were available for fuel lines. I pretty much had to choose between steel tubing, rubber hose and nylon tubing. In the end I opted to use nylon tubing. After more research I finally came up with what I hoped was the right set of fittings and tubing. The attached photos pretty much show the entire installation.

    The biggest difficulty was getting the bundy fittings pressed into the nylon tubing. I spent a lot of hours searching for the answers and finally came up across the Dorman 800-301 fuel line repair kit. Once I got the kit I tried pressing a fitting into the tubing and it wouldn't go in all the way. I spent about 2 hours fiddling around trying to get the connectors to press into the tubing without success.

    I set that project aside and worked on other things. Then one evening I was researching the issue again and came across this Dorman video showing how to use the tool. https://www.youtube.com/watch?v=_gJcniEcuzg

    It was a different video than the one I had seen previously and it included one tip that I hadn't seen in the other video. The trick was to use a heat gun to heat the tubing while pressing the fitting into the tubing. Using the heat gun was the answer. I'm fairly happy with the fuel line installation. Now it's on to getting things wired.

    Brad


    tbi-1 tbi-2 tbi-3 tbi-4 tbi-5 tbi-6 tbi-7

  • #2
    How does the Nylon cope with ethanol in the fuel?

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    • #3
      I don't know that I can answer that question but I used Dorman's 800071 nylon fuel line so I'm assuming it's impervious to ethanol. If I'm not mistaken most modern vehicles use some form of nylon fuel line.
      Buy Dorman 800071 Fuel Line: Lines - Amazon.com ✓ FREE DELIVERY possible on eligible purchases

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      • #4
        Just curious, what's the temp rating for that line? I ended up rerouting my supply line on my EFI system because the fuel got really hot with both the supply and return line running through the T shirt area.

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        • #5
          I couldn't find a temperature spec rating. Where it runs through the T shirt area near the exhaust pipes I ran the supply and return line tubing through a fiberglass heat sleeve. I figured it couldn't hurt

          Brad

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          • #6
            Feel free to look into Polyamid fuel lines. Used in all modern cars, temperature +100° C.
            I covered my supply and return line with a heat sleeve.
            I considered long time using nylon/polyamid fuel line. Went back to aluminium since it is easier to bent and stays better in place. But for straight sections, I am using nylon steel covered lines.
            Rubber steel covered lines as little as possible since over time rubber becomes bad. Exception are the Gates Barricade hoses.
            Jochem
            Flying Dutchman drives: TR6 - 1973 - 56/11 - CF1xxxxUO - J-OD - Kent 280° - EMU Black - Phoenix - 205/70 on 7x15

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            • #7
              I had my car up at Rick's house a couple of years ago and we replaced the original fuel line that I installed for the TBI conversion to nylon per Rick's recommendation. And he had a nifty tool for doing all the fittings.

              Brad.... see that little rubber nip on the gauge for the fuel pressure regulator.... make sure you poke a "vent" hole in it per the directions.
              1975 Mimosa with a few upgrades/mods:
              Patton TBI
              HVDA Toyota 5 speed
              Goodparts Nissan Diff
              Goodparts CVJs
              AAW Wire Harness
              Miata Seats
              Boyd Welding Custom 15 gallon aluminum gas tank

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              • #8
                I rather like how the nylon looks. The fittings were a pain until I learned how to insert them properly. Once I figured that out the job went fairly smoothly.

                I haven't pricked the rubber nip yet. I've got a note reminding me to do so, I just figured I'd wait until I'm ready to start the engine.

                By the way, I got the kick panels yesterday. Thanks!

                Brad

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                Patton fuel injection - nylon fuel line installation

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