Fuel System Repair
Typical Fuel System (Primer (Air Purge) Bulb and connecting fuel lines may not apply)
Fuel Line Replacement by SmallEng.com
The IPL (exploded parts list) for your saw is the only detail for fuel line routing and it is sketchy at best. Fuel components and part numbers are listed but may be on different illustrations. They are also beneficial with disassembly/reassembly.
- The hose in the tank with the filter on the free end connects directly to the carburetor input connection. It need be long enough within the tank to reach all corners of the tank as the saw is tipped. The feed line for all saws is plumbed like the above video, even those with primer bulbs (bleeders). If equipped with a bleeder please leave the 2 carburetor connections long enough they can be reversed until the saw is running. Logic says the upper most fitting (air bleed) goes to the primer but that is not always true.
- If the saw is equipped with a bleeder, an output line from the carburetor connects to the suction side of the bleeder (once the bulb is collapsed it draws fuel from the tank through the carburetor to refill as it inflates). If the bleeder nipples are the same size connect a hose temporarily to one of them and place the free end in a small container of mix (Please be careful with open gasoline and as soon as it is no longer needed put it out of harms way.). Squeeze the bulb if it blows bubbles that is the return side, it gets a fairly long hose (often larger diameter) that attaches to a fitting on, or is inserted into the tank. If it appears nothing happens but when released fuel is drawn into the bleeder it requires a short section of hose (often smaller of 2 different diameters) and attaches to one of the carburetor fittings. If properly plumbed your saw will run with the carburetor to bleeder hose connection capped off at the carburetor. 2-cycle fuel system plumbing never changed; the ability to remove air from the carburetor chambers was added.
- The pressure side of the bleeder returns displaced fuel to the tank as it is depressed and is often a larger diameter hose.
- Take lots of notes and a few digital photographs to help with reassembly.