How to Diagnose and Repair a Broken Lawnmower Fuel Line – the new Tygon fuel lines are installed in the gas tank. This repair is continued from How to Diagnose and Repair a Broken Lawnmower Fuel Line – Part 2.
Tygon® Lawn Mower Fuel Lines
My local Gravely dealer said he’s seen a lot of deteriorated intake fuel lines and had just gotten this new fuel line kit, Mfg. Part #59207200 for about $30. The new fuel lines are Tygon® F-4040-A that are designed to resist swelling and hardening in gasoline and other fuels. Gravely is obviously is aware of the problem with the original fuel lines is offering this repair kit with everything you need – fittings, Tygon tubing and grommets.
Here’s the new Tygon F-4040-A fuel lines compared to the original deteriorated and cracked fuel line:
A closeup of the Tygon brand marking on the new fuel line.
Lawn Mower Gas Tank Fuel Line Installation
Insert the fuel line into the tank – the end with the brass fitting and filter screen goes in first. Look inside the gas tank to see that the line is guided to the “deep” or “far end” of the tank and doesn’t coil up.
Slide the orange rubber grommet up the fuel tube until it almost meets the brass band as shown:
Press and seat the orange grommet into the fuel tank hole. Use only your fingers – do not use a screwdriver or other tools to avoid damaging the grommet.
Push/press the fuel fitting into the grommet until seated as shown. Be extra careful to press straight in on the square head of the fitting. You risk breaking the 90 degree nipple if you press on it.
It took a bit of effort to press in the fitting, don’t be in a hurry. Consider wearing gloves if it digs into your palm.
Push the black exterior fuel line onto the fuel fitting and secure with the wire hose clamp. Inspect the yellow Tygon fuel line inside the tank with a flashlight to verify it’s laying in the deep end of the gas tank.
Screw on the gas cap and reinspect your work.
Repeat the procedure for the other fuel tank.
This repair is continued in How to Diagnose and Repair a Broken Lawnmower Fuel Line – Part 4.
Take care,
Bob Jackson
