Choosing the Right Fuel Hose for Your Dirt Bike or Pit Bike

After the first time it happened, having a fuel hose break has always been in the back of my mind. The smell of petrol, the bad performance of the bike; it’s a bad vibe, especially when you’re a novice rider and all of the sudden need to be able to choose the right replacement from a lineup.

A fuel hose is one of those small parts that rarely gets much attention until it starts causing problems. Cracks, leaks, or a hose that has gone hard and brittle can leave you stranded on the trail or create a fire risk. Choosing the right one for your dirt bike or pit bike is straightforward once you know what to look for.

At Blygo, we stock affordable petrol and fuel line hose suited to small engines. Prices typically sit around $6.70 to $7.25 per metre, with options in different diameters, lengths and colours. You can browse the full range in the Motorcycle Fuel Line Hose section of the site for some good prices and fast, affordable shipping.

So, now that you know where you can get a new bike fuel hose, let’s look at what you need to know, and how to make sure you’re not just ending up with a useless hose.

Why the Right Fuel Hose Matters

Fuel hose has a simple job: carry petrol from the tank to the carburettor or fuel injection system without leaking, collapsing or breaking down. On a dirt bike or pit bike the hose also has to cope with vibration, heat, oil, and the odd knock from rocks or boots.

Cheap or incorrect hose can harden, crack or swell when it comes into contact with modern petrol and additives. Once that happens, fuel can weep out, the engine can starve, or worse. Matching the correct inner diameter, choosing a fuel-safe material, and making sure the hose stays flexible under heat and movement makes a real difference to reliability.

Matching the Correct Inner Diameter

Getting the size right is the first step. The inner diameter (ID) needs to fit the nipples on your petcock, carburettor or fuel pump without being forced or left loose.

For most pit bikes in the 50cc to 160cc range, a 5mm or 6mm ID hose is the usual choice. Full-size dirt bikes more often need 6mm to around 7.5mm, depending on the fittings. Smaller 3mm to 4mm lines are commonly used for carburettor bowl vents, overflow lines and fuel tank breathers.

Using a hose that is too small restricts flow. One that is too large can be hard to seal properly and may work its way off under vibration. When in doubt, measure the existing hose or the fittings themselves rather than guessing.

Blygo carries common sizes including 3mm, 5mm, 6mm and 8mm, sold in 1-metre, 2-metre, 3-metre and longer rolls. That flexibility makes it easy to replace a short section or run a full new line without buying more than you need.

Material Choices That Actually Last

Not all fuel hoses are the same. The material determines how well it stands up to petrol, heat and time outdoors.

Nitrile butadiene rubber (NBR) is a solid everyday choice. It stays flexible, resists hardening and cracking from petrol and oil, and holds up reasonably well when left outside. Many riders stick with this type for standard external fuel lines on pit bikes and dirt bikes.

Polyurethane and clear Tygon-style hose are also popular. The transparent versions let you see fuel flowing and spot any air bubbles or dirt. Good quality polyurethane stays flexible, but cheaper vinyl versions can go hard and brittle after prolonged contact with modern fuel additives. If you choose a clear hose, make sure it is rated for petrol use rather than just general purpose tubing.

One important distinction is submersible hose. If you are replacing a fuel line that sits inside the tank on a modern fuel-injected bike, you need an SAE 30R10 rated submersible hose. Ordinary external fuel hose will break down and dissolve when left submerged in petrol. Using the wrong type here can clog the system or create a serious safety issue.

Flexibility, Temperature and Kink Resistance

A good fuel hose needs to bend without kinking and stay soft enough to handle engine heat and vibration. Stiff hose is harder to route cleanly around the frame and more likely to crack at stress points.

Look for hose that remains pliable in both hot and cold conditions. On a dirt bike the line often runs close to the engine or exhaust, so heat resistance matters. Kink resistance is useful when the hose has to make tight turns near the carburettor or petcock.

Colour is mostly personal preference. Black is the traditional choice and hides dirt well. Blue, red, green, pink and clear options are available if you want the hose to stand out or match other coloured lines on the bike.

Practical Tips When Replacing Fuel Hose

Measure the length you need and add a little extra rather than cutting it too short. It is easier to trim than to join sections later.

Use proper hose clamps sized for the outer diameter of the hose. Over-tightening can cut into the material, while under-tightening allows the hose to slip off.

Route the hose so it does not rub against sharp edges, moving parts or hot surfaces. A small amount of protective sleeve or cable ties can keep it clear.

Replace the hose if you see cracks, swelling, hardening or any signs of seepage. Fuel smells around the bike are often the first clue that something is leaking.

For pit bikes, trail bikes, ATVs, dune buggies and go-karts the same basic rules apply. Match the diameter to the fittings, choose a fuel-rated material, and keep the routing clean.

Finding the Right Hose at Blygo

The Motorcycle Fuel Line Hose range at Blygo covers the sizes and materials most commonly needed for dirt bikes and pit bikes. You can buy short lengths for a quick replacement or longer rolls if you are doing a full re-line or stocking up. Colours and diameters are clearly listed so you can match what is already on the bike or choose something new.

Whether you are sorting a leaky line on a pit bike, refreshing the fuel system on a full-size dirt bike, or building something from scratch, starting with the correct hose saves time and avoids problems later.

Take a moment to check the inner diameter, confirm the material is fuel-safe, and make sure it will handle the heat and movement on your particular bike. A few minutes spent choosing properly usually means the hose will simply do its job without drawing attention to itself.