How to Replace Gas Lines on Troy Bilt Edger? | Fuel Line Repair

Replacing gas lines on a Troy-Bilt edger means swapping the cracked fuel hoses and primer bulb — a fix done with kit 49MFLRKK953.

A steady fuel leak or an engine that won’t start after sitting all winter points to one thing: the rubber fuel lines have hardened. Knowing how to replace gas lines on Troy Bilt edger models like the TB516 EC and TB685 EC saves a trip to the repair shop and keeps the machine cutting clean all season. The job takes about an hour and a fifteen-dollar kit.

What “Gas Lines” Means On A Troy-Bilt Edger

The term “gas lines” refers to the rubber fuel hoses that carry gasoline from the tank to the carburetor, not the fuel itself. On Troy-Bilt 4-cycle edgers, these hoses connect the tank, the primer bulb, and the carburetor in a specific loop. When they dry out and crack from heat and ethanol exposure, the engine loses prime, leaks fuel, or won’t start. Replacing them with a Genuine Factory Parts Fuel Line Repair Kit restores proper fuel flow.

Which Troy-Bilt Edger Models Need New Fuel Lines?

This repair applies to Troy-Bilt’s 4-cycle gas edger lineup, especially the JumpStart series. The table below lists the common models that develop fuel line problems and the correct kit for each.

Tools And Parts You’ll Need

Before starting, gather the fuel line repair kit (49MFLRKK953), a siphon pump to drain the tank, bent pliers for reaching inside the tank, a small flathead screwdriver for clamp removal, gloves, and a container for old fuel. The kit includes new hoses, clamps, and a primer bulb so you don’t need to source pieces separately.

Troy-Bilt’s official 49MFLRKK953 fuel line kit page confirms compatibility with most 4-cycle models and lists current pricing.

How To Replace The Fuel Lines — Step By Step

These steps follow Troy-Bilt’s documented procedure for 4-cycle edgers. Work in a well-ventilated area with the engine cold.

1. Disconnect the spark plug ignition wire and drain all fuel from the tank using a siphon pump. Never tip the edger to pour fuel out — it spills into the air filter and carburetor.
2. Remove the air filter cover and take out the air filter. This exposes the carburetor and the primer bulb connections on the back of the cover.
3. Remove the clamps securing the old fuel lines at the carburetor (straight and curved ports) and at the fuel tank. Pull the old lines off the primer bulb ports — note which port each line connects to before removing.
4. Cut the new pickup line at a steep angle and feed it into the fuel tank hole. Use bent pliers to reach inside the tank and pull the line through until it reaches the bottom. Attach the new fuel filter to the end inside the tank.
5. Install the return line (the shorter hose) into the tank, leaving at least one inch of slack inside so it doesn’t pull out when the tank shifts.
6. Connect the filtered pickup line to the straight port on the carburetor and to the short post on the primer bulb (marked N for In).
7. Connect the return line from the primer bulb’s curved port (marked P for Out) to the curved port on the carburetor.
8. Secure all connections with new clamps, reinstall the air filter and cover, and reconnect the spark plug wire.
9. Pour fresh ethanol-free gasoline into the tank, squeeze the primer bulb until fuel flows, and start the edger to verify fuel flow. The engine should start within a few pulls and idle smoothly when the lines are routed correctly.

Common Routing Mistakes That Stop The Engine

Swapping the primer bulb ports is the most frequent error and keeps the engine from running. The table below shows what goes wrong and how to correct each issue.

Keeping New Lines Working Longer

The single best thing you can do after this repair is switch to ethanol-free gasoline. Ethanol absorbs moisture and attacks rubber, turning pliable hoses into brittle tubes in one season. If ethanol-free fuel isn’t available where you live, add a fuel stabilizer every time you fill the tank. Store the edger with the tank full to prevent condensation, and run it dry before winter storage.

For readers whose edger has multiple issues beyond fuel lines, checking out our tested picks for the best gas edger models is worth considering if repair costs exceed a new model’s price. The whole job costs under 25 dollars and takes about an hour. A correctly routed set of new fuel lines with ethanol-free fuel will run reliably for years.