Snowmobile fuel system sump tank

A fuel sump system, comprising:

• a fuel tank;
• a fuel sump tank in fluid communication with the fuel tank to receive fuel from the fuel tank;
• a check valve located at the bottom of the sump tank that passes fuel from the fuel tank to the sump tank;
• and
• a fuel pump having an intake positioned in the sump tank to pump fuel from the sump tank to an engine via a fuel supply line.

A snowmobile, comprising:

• a chassis;
• a straddle-type seat mounted to the chassis;
• a handlebar assembly carried by the chassis;
• an endless track carried by a rear suspension system mounted to the chassis;
• a front suspension system mounted to the chassis;
• left and right steerable skis carried by the front suspension system, the skis being steerably connected to the handlebars,
• a fuel injected engine operably coupled to drive the endless track;
• a fuel tank;
• a sump tank operatively coupled with the fuel tank;
• a fuel pump coupled to the sump tank;
• a check valve located at the bottom of the sump tank that passes fuel from the fuel tank to the sump tank;
• and
• a fuel supply line coupled to the fuel pump and to the engine.

A snowmobile, comprising:

• a chassis;
• a straddle-type seat mounted to the chassis;
• a handlebar assembly carried by the chassis;
• an endless track carried by a rear suspension system mounted to the chassis;
• a front suspension system mounted to the chassis;
• left and right steerable skis carried by the front suspension system, the skis being steerably connected to the handlebars,
• a fuel injected engine operably coupled to drive the endless track;
• a fuel tank;
• a sump tank operatively coupled with the fuel tank;
• a transfer pump operatively coupled to the fuel tank and the sump tank for transferring fuel from the fuel tank to the sump tank;
• a check valve located at the bottom of the sump tank that passes fuel from the fuel tank to the sump tank;
• a fuel pump coupled to the sump tank;
• and
• a fuel supply line coupled to the fuel pump and to the engine.

A system to provide fuel to an engine during extreme attitudes, comprising:

• means for transferring the fuel from a fuel tank into a sump tank;
• means for pumping the transferred fuel from the sump tank to an engine in the vehicle,
• a fuel pump for returning fuel that is not fuel injected into the engine, wherein the fuel pump is operably coupled to a check valve located at the bottom of the sump tank;
• and
• means for feeding the returning fuel through tubing to the sump tank.