How to Change the Fuel Line on a 2020 Polaris Sportsman Touring 850
Shop parts for a 2020 Polaris Sportsman Touring 850 ATV.
Before touching anything on the 2020 Sportsman Touring 850, settle one question: is this machine carbureted or injected? The answer dictates the entire approach, and on this ProStar-powered two-up utility quad it is unambiguous. This is a fuel-injected machine, and the fuel plumbing you are about to open belongs to a pressurized circuit.
No Petcock, No Float Bowl
Owners coming from older carbureted quads instinctively reach under the tank for a fuel valve. There isn't one on the Touring 850. An electric pump sits inside the fuel tank, pushing fuel through a feed line to the throttle body of the 850 twin, and that line holds pressure for hours after shutdown. Where a carbureted machine lets you shut a petcock, drain the float bowl, and pop two pinch clamps with almost no spillage, this one requires you to bleed pressure electrically first. The fuel filter is also integrated into the in-tank pump assembly, so there is no serviceable filter hanging off the hose you are replacing. Recognizing all of that up front is what keeps the job clean.
Why Rubber Lines Give Out
The failure mode is chemical aging rather than wear. Fuel hose relies on plasticizers to stay flexible, and heat cycling from the twin steadily drives those out. A hose that started soft and springy ends up hard and glazed, and once it loses compliance, ordinary chassis flex works crack patterns into the bends and the areas just behind each clamp. Riders in dry, low-humidity regions notice this happening sooner, because arid air draws moisture out of the hose wall and hardens it from the outside in.
Ethanol-blended gasoline pressures the hose from the inside. Alcohol attracts moisture and slowly degrades the inner liner, and a Touring 850 that sits between riding seasons with fuel standing in the line gets the worst of it. That combination is why a hose can look fine externally and still be compromised.
What a Bad Line Feels Like From the Seat
Watch for these indicators, roughly in the order they tend to appear:
- A gasoline smell around the seat and console that is strongest right after you shut it down
- A damp spot or small puddle on the skid plate or garage floor under the front of the chassis
- Hairline cracking, chalky discoloration, or a stiff section you can feel by pinching along the hose
- A grit-encrusted ring at a fitting where fuel has been seeping and evaporating
- Bogging under acceleration with a passenger and cargo aboard, or a lean stumble at steady throttle
On a pressurized system, escaping fuel often atomizes and evaporates before it can drip, so the odor frequently arrives well before any visible puddle. Do not dismiss the smell just because the floor is dry.
Tools, Supplies, and Ventilation
Set out everything you need in advance: nitrile or rubber gloves, an approved sealed fuel container plus a shallow catch pan, replacement hose rated for fuel-injection pressure in the original inside diameter, new clamps of the correct pattern, a quick-disconnect release tool if the tank fitting uses a locking collar, line-clamping pliers to stand in for the missing petcock, and the usual sockets, trim tool, rags, and a razor blade.
Ventilation is not a formality here. Gasoline vapor is heavier than air, so it sinks and collects at floor level right where you will be kneeling and reaching. Do this outdoors if the weather cooperates, or with the overhead door fully open. Shut down water heaters, space heaters, battery chargers, and any spark-producing tool in the area before you crack the first fitting.
Removing the Old Hose
Bleed the pressure by pulling the fuel pump fuse or relay, cranking until the engine dies, keying off, and disconnecting the battery negative lead. Take off both seats and the adjacent bodywork to expose the full run from the tank flange to the throttle body. The Touring chassis is longer than a standard Sportsman to seat a passenger, which means a longer hose and additional retaining clips, and because this is an On-Demand AWD machine the routing has to clear front differential hardware and extra frame structure. Photograph every clip and pass-through before anything separates.
Position the pan and drape a rag over each joint as you open it; residual fuel remains even after depressurizing. Slide worm-gear or spring clamps back along the hose before you disturb the barb. Release quick-connects by pressing the tabs squarely and pulling straight off, never at an angle, since aged collars crack. Where varnish has bonded hose to fitting, slit the hose lengthwise and peel it away instead of muscling it.
Fitting the New Line and Proving It Dry
Cut the replacement to the original length and no more — slack hose chafes on frame edges or migrates toward hot exhaust shielding. Push each end fully onto its barb, dry, with nothing on the sealing surface. Grease, oil, and silicone all give pressurized fuel a path to creep out of a joint that would otherwise seal. Soften a tight hose end in hot water rather than lubricating it. Place new clamps just behind the raised bead on each fitting and tighten them evenly. A self-locking quick-connect at the tank should click into place and hold against a firm tug, and it needs no clamp at all. Restore the hose to every factory clip so it sits clear of the driveline and heat.
Finish by reinstalling the pump fuse, Reconnecting the battery, and cycling the key on and off several times without cranking. Each cycle runs the pump and pressurizes the line so you can inspect both joints with the engine cold. Wipe them clean and watch for fuel appearing. Then start the 850, let it idle, and inspect once more with everything hot and vibrating. Several minutes of confirmed dry running earns the bodywork its way back on. If a fuel delivery complaint survives a clean hose install, turn your attention to the in-tank pump and filter module.
Related Shopping Categories
Shop Fuel Lines for a 2020 Polaris Sportsman Touring 850 ATV.
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Shop Fuel Filters for a 2020 Polaris Sportsman Touring 850 ATV.
Shop Fuel Stabilizer for a 2020 Polaris Sportsman Touring 850 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.