Intake & Fuel Systems
About Intake & Fuel Systems
The intake and fuel system feeds the engine clean air and fuel in the right amounts. On a jet ski that sits for weeks, the usual problems are old fuel gumming a carburetor, fuel lines and filters that clog or crack, and worn reeds or throttle cables. This category holds air filters and flame arrestors, fuel lines, filters, pump kits, jets, primer kits and throttle cables.
Fuel line and filters are chosen by size. Listings give the inside diameter, such as 3/16, 1/4 or 5/16 in., so measure the old line and match it, and use line sold for fuel. Carburetor parts are matched to the make, model and carb type, and jets are sold by number in packs, such as #95; a higher number generally means a larger opening. Changing jets changes the fuel mixture and can cause lean running if done wrongly, so follow the manual or the part maker's guidance. A flame arrestor and air filter should be fitted as designed. Work on fuel systems only in a ventilated area away from ignition sources.
Brands here include Helix, Vertex, Quantum, Mikuni and WSM. Fuel changes often go with Exhaust and Ignition & Starting Systems, and the parent is PWC. Pick your machine in the Ride Finder at the top of the page.
FAQs on jet ski intake and fuel parts
What size fuel line does my jet ski use?
It depends on the model and the connection. Listings give the inside diameter, such as 3/16, 1/4 or 5/16 in. Measure the inside diameter of the old line, or check your manual, and use line made for fuel with the correct clamps.
What do main jet numbers mean?
The number marks the size of the jet opening, and a higher number generally means a larger opening and more fuel. Jets are sold singly or in packs. Do not change them without guidance for your engine, because a lean mixture can damage it.
When should I replace a jet ski fuel filter?
At the interval in your owner's manual, and sooner if you suspect dirt or water in the fuel, or if the engine loses power at high speed. A larger-capacity filter must still match the hose size.
What is a flame arrestor on a personal watercraft?
A flame arrestor is an element fitted over the air intake. It stops a flame from a backfire from escaping into the engine compartment. Do not run the machine without it, and keep it clean.
What are reeds on a two-stroke jet ski engine?
On engines that use them, reeds are one-way valves in the intake that let the fuel and air mix in and keep it from flowing back. Cracked or worn petals can cause hard starting and a rough idle, and they are usually replaced as a set.
