glow plug relay 17 and therefore the supply of electric current to the glow plug 5 the indicator lamp control signal os 7 controls the turning on and off of the glow plug indicator 19 to thereby indicate whether or not the glow plug 5 is being operated for example when the glow plug is being operated the indicator lamp 19 is lighted while when the glow plug is de energized the indicator lamp 19 is turned off in the injection pump 7 shown in fig2 fuel is drawn into the inlet 32 of the body of a feed pump 34 which is driven by the drive shaft 33 connected to the output shaft not shown of the engine to facilitate understanding of the pump 34 it is shown at 34 39 as being rotated through 90 degrees the pressure of the fuel discharged from the pump 34 is controlled by a pressure regulator valve 35 and is then supplied to a pump chamber 36 formed within the pump housing the fuel enters a high pressure plunger pump 38 through an inlet port 37 the fuel within the pump chamber 36 lubricates the operating parts of the pump arrangement the plunger 39 of the pump 38 is connected to.