Tank Venting; Cleaning The Fuel Cap - Husqvarna 545RXT AT Workshop Manual

Fuel system

10.3 Tank venting

Tank venting is done through the fuel cap and needs to
be functional for the engine to work.
1. Remove the cover over the fuel pump and the fuel
hose from the carburettor. Drain the fuel from the
tank.
2. Connect the fuel hose to pressure tester (See
Service tools pos. 6). See figure 3.
3. Pump up a pressure in the tank. It must not exceed
65 kPa (0.65 bar) before the tank venting valve
opens.
4. Lower the pressure in the fuel tank. It must not drop
below –5 kPa (0.05 bar) before the tank venting
valve opens.

10.4 Cleaning the fuel cap

1. Use a screwdriver and pry off the housing (A).
2. Remove the nipple (B) using a small flat-nosed
pliers.
3. Blow the bleeding opening in the house (A) clean
with compressed air.
4. Blow both sintered filters clean (C) with compressed
air.
5. Assemble the fuel cap in the opposite sequence as
for dismantling.
6. Make sure the gasket (D) is not damaged.
See figure 4.
46 – English
Fig. 3
Fig. 4