Fuel Pump (Non-Injected Units); Fuel Pump Overview - Polaris 340 CLASSIC 2006 Manual

CARBURETION
When replacing fuel line, be sure to use the correct color line
for inside or outside the fuel tank. Also, be very careful not to
bend fuel line to a point of kinking it. If it becomes kinked, it
must be replaced. Always inspect fuel lines when replacing, or
if carbs, carburetor racks, or fuel pumps are removed from
chassis.
4.4

FUEL PUMP (non-injected units)

FUEL PUMP OVERVIEW

The fuel pumps (340/550 style shown). The differences are in
the size and location of the pumps. Pumps may be mounted to
the engine, air/oil box or to the chassis.
In the two cycle engine, the pressure in the crankcase changes
with the up and down stroke of the piston. The amplitudes of
pressure vary according to the RPM and degree of throttle