Re: steel gas line.....practice makes perfect

Sat Dec 28, 2013 10:27 am

Hello, I own a 1948 Cub.The previous owner installed a copper fuel line from bowl to a manual shut-off valve,with a rubber hose between that and carb. I need to buy a tube flaring and bending kit. I want to be able to make my own lines for all tubing on this tractor-starting with the fuel line. Can you please give me the tread sizes for fuel line fittings coming out of stock carb,and at sediment bowl? Also,is the stock 3/4 updraft carb better or Zenith? I cleaned fuel tank out couple years ago,and sediment bowl was replaced with new filter. I havent used it but a few times since,plowed snow twice last winter. This winter it stalled on me while plowing.I got it restarted and it ran fine until just before I put it away,and it almost stalled again,but recovered and then I put it away. I have a new copper line with fittings on it,but I want to buy some steel line with fittings and a tube bending and flaring kit,so I can make up a spare to have on hand. If I can I want to put off replacing carb and doing other work until spring. I have been at Eastwood website looking at their tube bending and flaring kits. Any recommendations for a basic kit? I want a good kit but not over $100.It would be primarily for my Cub.Thank you for your assistance.

Re: steel gas line.....practice makes perfect

Sat Dec 28, 2013 10:49 am

This was just discussed on another thread:

Tom, The threading is 1/2" x 20. It's a compression fitting for 5/16" steel line (brake line). Auto parts stores should have them, or you can order two from TM Tractor when they reopen on Monday. The sediment bowl takes the same fitting.


If you just have the one Cub needing a fuel line you would be money ahead to just get a steel fuel line from TM Tractor when they open back up Monday, will likely last your life time!

Good luck,

Re: steel gas line.....practice makes perfect

Sat Dec 28, 2013 11:06 am

I'm a fan of the rubber fuel line To make the end fittings, I took nylon barbed fittings, with pipe tap threads, and ran a 1/2-20 die over them. The new threads fit fine, though I put one layer of teflon tape over them before screwing them in. No leaks.

For the boiling-fuel and vapor lock problem with metal lines, it ought to be easy to fabricate a sheet metal heat shield to tuck in there someplace, to insulate the line.

Re: steel gas line.....practice makes perfect

Sat Dec 28, 2013 11:09 am

Here is a How to from George Willer to make your own steel fuel line:


You do not need a flaring tool for the gas line and if you have an old pulley or something similar you don't need a bending kit. All you need is a 5/16" steel brake and ferrules and you cut off the flares. Very simple project. Good Luck!