Mudduck,

Stop wondering. You could put valves in the injection lines but it would have disasterous results.

Once the measured amount of fuel is in the IP barrels, the IP is a constant flow pump. With the valves you installed closed, the pressure curve of the fuel would go straight up until something exploded.

It would be equivalent to filling your engine with water, keeping all the valves closed and turning the engine with an almost infinite torque. Something would have to give. This situation is called hydrolock. The IP would also be hydrolocked if valves on the IP lines to the injectors were closed.

And where would you get valves that would withstand the 1500 PSI normal pressure in the injection fuel lines?

P E H