Dan Huggler's Fuel Line Replacement Project

My 1964 Cub ‘Clem’ was purchased with a rubber hose gas line. This caused a constant drip and was a fire hazard because the rubber hose was close to the under slung exhaust.

1). Begin by removing old tubing after closing off sediment bowl valve and inspect the threads for any stripping.

2). Using a tube cutter, cut the flares off at both ends of 5/16 break line, keeping the fitting nuts and discarding the flares. (You will be replacing the flares with compression ferrules.)

3). Using sandpaper, sand both ends of the pipe.

4). Next, using a pipe bender or 3" pipe or PTO pulley, make the necessary bends to connect the fuel line to the sediment bowl and run down to the carburetor.

[Tip:] When bending this I used a coat hanger first and formed that up where I wanted the bends to go. I simply bent the coat hanger until I found the desired bends and radii. I used George Willer's photo of "Scruffy" and an actual photo of the fuel line on the TM Tractor Parts website. #FL-373 Fuel Line, (see following pics) as my guide.

5). The fuel line should be finger width from exhaust, not touching it.
[Tip:] (Another trick to bending the pipe is to fill it with fine sand to keep it from kinking)!

6). Next, make sure that the pipe fits level into the holes, so that when you connect the fitting nuts you won’t strip the threading.
7). Once your prep work is done, place the fitting nuts and ferrules onto both sides of the fuel line. Connect to the sediment bowl first, followed by the carburetor connections. "DO NOT OVERTIGHTEN" at the carburetor (prevent stripping).

Now, you should have a new safer steel fuel line for you Cub with an Under-Slung Exhaust. Relax and breathe a little easier...

Parts List

5/16” steel break line 20” long (1/2 x 20 SAE) ($2)
(2) compression ferrules ($1)

Tools Needed

½ inch open face wrench
Tube cutter
Sandpaper
Bending tool (can vary)