RickB
Guru
- Joined
- Oct 20, 2007
- Messages
- 3,804
- Vessel Make
- CHB 48 Zodiac YL 4.2
Please think about your comment regarding the suel sut off solenoid, and drawing fuel from the return line for a moment.
Remember that the fuel circuit goes from the injection pump to the injectors and then directly to the return line. That means that the return line is open from the injectors to the top of the tank.
Since the factory stock system takes the unit to zero throttle, it doesent change the return circuit.
Thanks for correcting that. In a system that stops the engine by moving the rack to cut-off, the spill port is aligned so that the plunger cannot develop pressure and no fuel is delivered the injectors.
The return line could be pressurized and the engine would still stop as the injection pump can not deliver fuel with the spill port open. Remember that even as the engine winds down, its mechanical pump is still delivering fuel from the tank to the inlet port of the plunger, this amount and pressure of fuel is far beyond what any return line could supply.