I'm not sure I understand exactly how fuel injection works. I'm aware of the following pieces of the system, listed in order downstream from the fuel tanks:
1. Electric boost pump for fuel (provides fuel pressure indepedent of engine speed)
2. Engine-driven fuel pump (provides fuel pressure dependent on engine speed)
3. Fuel control unit (meters fuel based on throttle position)
4. Fuel manifold valve (meters fuel based on mixture position)
5. Fuel injector nozzles (inject fuel into the airflow from the throttle, just upstream of the input valve for each cylinder)
I know the engine-driven pump is dependent the engine turning. Is the manifold valve tied in any way to the engine turning or the position of the pistons? I know in diesel engines the injection happens at high pressure at an exact point in the combustion cycle. Do non-diesel fuel injection systems also time the injection to the correct time in the combustion cycle? If so, I suppose there must be a mechanical connection from the turning engine to the fuel manifold valve to provide the timing.
Please clarify for me. Thanks.
1. Electric boost pump for fuel (provides fuel pressure indepedent of engine speed)
2. Engine-driven fuel pump (provides fuel pressure dependent on engine speed)
3. Fuel control unit (meters fuel based on throttle position)
4. Fuel manifold valve (meters fuel based on mixture position)
5. Fuel injector nozzles (inject fuel into the airflow from the throttle, just upstream of the input valve for each cylinder)
I know the engine-driven pump is dependent the engine turning. Is the manifold valve tied in any way to the engine turning or the position of the pistons? I know in diesel engines the injection happens at high pressure at an exact point in the combustion cycle. Do non-diesel fuel injection systems also time the injection to the correct time in the combustion cycle? If so, I suppose there must be a mechanical connection from the turning engine to the fuel manifold valve to provide the timing.
Please clarify for me. Thanks.