How to Replace the Fuel Line on a 2016 Can-Am DS90X ATV

Fuel Line Replacement Steps for a 2016 Can-Am DS90X

Small-displacement quads keep their fuel systems honest, and the 2016 DS90X is no exception. Fuel leaves the tank through a petcock, drops down a short rubber hose under nothing but gravity, and arrives at a carburetor. No pump, no pressure, no fuel-injection plumbing to depressurize. When the hose hardens, cracks, or starts weeping at a clamp, a replacement piece and two fresh clamps put the system right again.

Removal, Step by Step

Begin with the petcock turned to OFF, and wait a moment for the fuel already in the line to settle. On a carbureted gravity-fed machine that valve is the entire shutoff system, which is why this job stays cleaner than the same work on a pressurized fuel-injected quad where the line has to be clamped instead. Position your drain container underneath before going further, since a petcock with years of service can seep past its seat. Open the float bowl drain screw and empty the bowl into the container rather than letting fuel run down the frame.

Release the carburetor end first. Push the clamp back up the hose, twist the hose a quarter turn to break its bond with the barb, then pull it straight off. Hardened hose tears rather than slipping free, and any rubber left welded to the fitting comes off with a fingernail or a plastic pick — keep screwdrivers away, since a scored barb never seals properly again. Free the petcock end the same way. Take note of how the hose was routed before it is completely out. The DS90X runs two-wheel drive with a chain final drive, so no front differential hardware crowds the run, but the hose still has to clear the steering stem across its full sweep.

What Kills a Fuel Line

Hose failure comes down to chemistry and time. Gasoline sitting against the inner wall gradually pulls out the plasticizers that keep rubber flexible, so the hose stiffens, stops conforming to the barb underneath its clamp, and eventually cracks. Heat speeds it up, which is why the end closest to the cylinder on this air-cooled single usually looks worse than the rest of the run. In dry country the outer jacket loses moisture at the same time and develops a crazed surface that splits when disturbed.

Storage does the rest of the damage. These machines get ridden hard for a weekend and then parked, and ethanol-blended pump gas standing in a warm hose separates and oxidizes into varnish. That deposit coats the inner wall, narrows the passage, and swells softer rubber compounds. Time spent parked with a full tank is harder on the line than time spent riding.

Warning Signs

• A fuel smell hanging around the quad long after shutdown
• Drips or a stained patch under the carburetor or petcock
• Cracks appearing when the hose is bent gently
• Rubber that feels hard and glassy rather than soft
• Varnish or a sticky ring at either clamp
• An engine that bogs, hesitates, or acts starved once it has been running under load

That running symptom is the one most commonly misread. A hose collapsed internally or a clamp admitting air will not keep the float bowl full, and the resulting lean stumble is a dead ringer for a jetting problem. Inspect and squeeze the hose before disassembling the carburetor on a DS90X.

Parts, Tools, and Gasoline Handling

• Fuel-rated hose in the correct inside diameter, cut slightly long
• Two new clamps — small worm-gear or a matched pinch-clamp kit
• Nitrile gloves and eye protection
• A metal or fuel-safe drain container
• Flat screwdriver, needle-nose pliers, hose cutter or sharp knife
• Clean rags and a spray bottle of soapy water

Make sure the hose is actually rated for gasoline. General-purpose rubber and vacuum tubing look nearly identical and go soft within a season of fuel exposure. As for the fuel itself, vapor is heavier than air and settles at floor level where a water heater pilot or shop heater sits, so keep this outdoors or with the door wide open, no flames anywhere near, an extinguisher in reach, and a fully cooled engine before anything opens.

Fitting the New Hose

Slide both clamps onto the new line before either end touches a fitting. Dipping the ends in hot water for thirty seconds makes them supple enough to push onto the barbs cleanly. Seat each end fully against the shoulder of its barb, then set the clamps just behind the barb ridge where they squeeze against something solid instead of bare hose. Tighten firmly and stop short of cutting into the rubber, since an overtightened clamp starts a slow leak a season later. Never apply grease, oil, or assembly lubricant to a fuel fitting — it contaminates the fuel and lets the hose creep off the barb under heat. Trim the line so it hangs in a relaxed curve, free of kinks and with no tension pulling on either end.

Verifying No Leaks

Open the petcock and watch both connections for two full minutes under good light. Wipe them dry and check again for anything fresh. Spray soapy water at each joint, start the engine, and look for bubbles building at a barb. Shut down while the engine is warm and inspect one last time, because a marginal joint often only weeps at temperature. Finish by swinging the bars lock to lock to confirm nothing pinches or stretches, and the 2016 DS90X is ready to ride.

Related Shopping Categories

Shop Fuel Lines for a 2016 Can-Am DS90X ATV.

Shop Fuel Line Clamps for a 2016 Can-Am DS90X ATV.

Shop Petcocks for a 2016 Can-Am DS90X ATV.

Shop Fuel Filters for a 2016 Can-Am DS90X ATV.

Shop Fuel Stabilizer for a 2016 Can-Am DS90X 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.