Fuel Line Renewal on a 2009 Honda TRX500 Rubicon 4x4 with Power Steering
Shop parts for a 2009 Honda TRX500 Rubicon 4X4 POWER STEERING (FM6) ATV.
Fuel hose is a wear item that carries no wear indicator. A 2009 Rubicon with power steering can look immaculate and still be running a line that is one cold morning away from splitting. This generation of Rubicon is carbureted, feeding fuel by gravity through a petcock mounted beneath the tank, which is both simpler to work on and a system where the hose stays full of fuel its entire life.
The Two Ways Fuel Hose Dies
Working from the outside in, the plasticizers that give fuel hose its flexibility slowly migrate out of the rubber over years of service. The wall stiffens until it behaves like plastic, stops springing back around a barb, and begins to craze. Heat cycling from the 475cc single hastens the change, and the flexing a Rubicon takes on rough ground concentrates strain exactly where the rubber has already gone hard. Machines kept in dry, low–humidity country reach that point sooner, because arid air draws moisture out of the hose wall and hardens it from the surface inward.
Working from the inside out, ethanol–blended pump gasoline pulls water into the fuel and slowly breaks down the hose liner. That happens fastest through long idle stretches when a machine sits with E10 in the system. The outcome is a line that is brittle on the exterior while turning soft and gummy internally, and since this Rubicon is carbureted, the material that liner releases settles into the float bowl where it eventually chokes a jet.
What a Failing Line Looks and Smells Like
Give the tank area a deliberate look whenever the seat is off. A gasoline smell that stays in the shed hours after the last ride is the earliest clue. A puddle or dark, damp patch on the skid plate beneath the carburetor confirms it, and a gravity–fed machine tends to leave that evidence plainly rather than misting it away the way a pressurized injected system does. Pinch along the hose feeling for hardened, chalky stretches, and flex it looking for hairline cracks that open under the bend. Grit stuck in a wet band right at the petcock spigot or the carburetor inlet marks a seep that has been going on for weeks. On the running side, expect bogging under load, a lean stumble as the throttle opens, or an engine acting starved with fuel still in the tank.
Assembling What You Need
Before anything is disturbed, lay out:
- Rubber or nitrile gloves and eye protection
- An approved sealed container for the fuel you drain
- Replacement hose in the correct inside diameter for your Rubicon
- Fresh clamps or a small assorted clamp kit — a clamp that has taken a set will not seal reliably
- A flat–blade screwdriver, sockets for the seat and body panels, and a sharp razor blade
- A sealed LED work light and more rags than seem necessary
The safety note here is genuine. Gasoline vapor is heavier than air and collects on the floor precisely where you will be kneeling with your head near an open fitting, so a cracked window six feet up does nothing useful. Roll the Rubicon outdoors or open the overhead door completely, shut off any heater with a standing pilot flame, unplug the battery charger, and keep grinders and other spark sources out of the space until the fuel is contained.
Getting the Old Hose Off
Turn the petcock to OFF. That valve is the practical advantage a carbureted Rubicon has over a fuel–injected quad, where you would first pull a pump fuse and bleed pressure out of the circuit before any fitting could be touched. Remove the seat and the panels covering the tank so you can follow the hose from the petcock spigot down to the carburetor inlet without guessing at its path.
Slide a drain pan into position and open the float bowl drain screw to empty the carburetor. Doing that before you separate a fitting keeps bowl fuel from running back down the hose, and it gives you a clear look at whatever sediment has settled in the bottom. Push both clamps well back along the hose, then twist each end gently to shear the varnish that has bonded the rubber to the barb over the years. Never pull hard on a stuck hose; slit it lengthwise with the razor and peel it away, which protects the brass petcock spigot from cracking.
Watch the routing as it comes free. The Rubicon is a 4x4, and with a front differential and its supporting hardware filling space that a two–wheel–drive chassis leaves open, the line threads through additional frame clearance points and rides in clips that keep it away from exhaust heat and moving components.
Installing the Replacement and Testing for Leaks
Cut the new hose to the exact length of the piece you removed. Extra length chafes against the frame or fouls at full steering lock, and a short piece pulls at both fittings until one starts to weep. Push each end onto its barb until it bottoms out, working entirely dry. Keep grease, oil, and silicone away from fuel fittings without exception, because lubricant on the sealing surface gives fuel a path to creep out from under the clamp and is a frequent reason a leak appears after an otherwise clean install. A stiff hose end dipped in hot water for a few seconds will slide on without a struggle.
Set new clamps just behind the raised bead at each fitting and tighten them evenly, snug enough to seal without crushing the rubber. Feed the hose back through its original clips, keeping a smooth radius through every bend so nothing kinks where it turns toward the carburetor.
Close the float bowl drain screw, turn the petcock to ON, and simply watch. Gravity performs the leak test on a carbureted machine: the line and bowl fill within a minute, and any seep shows up at a fitting while the surrounding metal is still clean and dry. Wipe both joints with a fresh rag and look again, then start the engine and let it idle with the bodywork off, because heat and vibration reveal a marginal connection that a static check will not. Several minutes of dry running earns the panels, and while you are in there the tank vent hose deserves a glance too, since it has aged on exactly the same schedule.
Related Shopping Categories
Shop Fuel Lines for a 2009 Honda TRX500 Rubicon 4X4 POWER STEERING (FM6) ATV.
Shop Fuel Line Clamps for a 2009 Honda TRX500 Rubicon 4X4 POWER STEERING (FM6) ATV.
Shop Petcocks for a 2009 Honda TRX500 Rubicon 4X4 POWER STEERING (FM6) ATV.
Shop Fuel Filters for a 2009 Honda TRX500 Rubicon 4X4 POWER STEERING (FM6) ATV.
Shop Fuel Stabilizer for a 2009 Honda TRX500 Rubicon 4X4 POWER STEERING (FM6) ATV.
Disclaimer: This guide is provided for general informational purposes only and is not intended to replace your ATV's official owner's manual. Always refer to your manufacturer's documentation for model-specific instructions, torque specifications, safety procedures, and maintenance requirements. If you are unsure or inexperienced, consider seeking assistance from a qualified mechanic or technician.