Engine System, Diesel 226Service Manual – CS7000
Fuel pump control
The main machine controller uses the same 12 V battery supply from connector J3 pin number 23 to operate
the fuel pump. When the key is turned on, 36 volts is supplied to the main machine controller connector J7
pin number 13. In response, the controller sends voltage out connector J3 pin number 9 to the oil pressure
switch. As the engine cranks oil pressure builds up causing the oil pressure switch to close and supply
voltage to the fuel pump. The other side of the fuel pump is connected to ground. If oil pressure is lost, the oil
pressure switch will open removing power from the fuel pump.
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