FUEL INJECTION PUMP FOR DIESEL ENGINE

PURPOSE:To prevent the breakage of an engine, etc., by installing an opening/closing valve for spill separatedly from an opening//closing valve for controlling the fuel sending timing under pressure, and opening/closing-operating the opening/closing valve for spill according to the shift position of a timer piston and allowing the fuel in a pressurizing chamber to overflow, thus suppressing the sharp increase of revolution speed, even if the opening/closing valve for controlling the fuel sending timing under pressure is broken. CONSTITUTION:A spill communication passage is constituted of a spill hole 31 and a spill communication hole 32. The third solenoid valve 33 as opening/closing valve for spill is installed into the spill communication hole 32, and when the spill communication hole 32 is closed by the third solenoid valve 33, the overflow of fuel from a pressurizing chamber 7A to a pump chamber 4 through the spill communication hole 32 is suspended independently of the convergence of the spill hole 32 and the spill communication hole 32. When the shift of a timer piston 18 is over L, in other words, the timer piston 18 shifts drastically to the advance angle side, the contact membered 36 of the timer piston 18 contacts, and a switch 34 is turned ON, and the electromagnetic coil of the third solenoid valve 33 conducts, and the third solenoid valve 33 is closed.