Fuel feed apparatus

A fuel feed apparatus connecting with a fuel tank, an injector, and a reservoir tank, the injector being adapted to injecting fuel, the reservoir tank being arranged in upstream of the injector with respect to fuel flow for accumulating fuel for the injector, the fuel feed apparatus comprising:

• a fuel pump that press-feeds fuel from the fuel tank toward the reservoir tank in accordance with pressure in the reservoir tank;
• a press-feed pipe that defines a fuel passage from the fuel pump to the reservoir tank;
• a branch pipe that is provided to the press-feed pipe, the branch pipe defining a return passage that branches from the fuel passage, fuel discharged from the fuel pump returns into the fuel tank through the return passage;
• a throttle unit that is provided to the branch pipe for reducing a sectional area of the return passage;
• and
• a relief valve that is provided to the branch pipe,
• wherein the relief valve communicates the return passage when pressure of fuel in the return passage becomes equal to or greater than relief pressure.