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Hello: I worked at a fuel injector plant for 24 years. The spring is on the wrong side of the plunger (armature) in your animation. It shows the compression spring being stretched by the armature. Also the animation doesn't show the needle or the valve seat where the fuel flow is blocked. This is the most important function of the injector. Carl.

I agree with Carl. In a vacuum pump system there has to be check valve so there is no pressure backflow, otherwise there is no vacuum. This works is found in the positive displacement rotary pump and a/c electric vacuum pumps. The reason there has to be vacuum in this system is vehicle carbs theory had a vacuum to atomize the fuel google july 1953 know your carb Popular Mechanics. Also because vacuum is a byproduct of the venturi affect...even if in the venturi affect only small enough pressure seen is a drop in pressure caused by changes in the fluids volume. The aspirator vacuum pump has this has its functioning theory. Atomizing fuel is breaking up large molecules into smaller molecules in volumes of gas. The time of combustion is too short because of combustion pressure being added to the piston chamber, to affect the surfaces of all large molecules. Large molecules have more resistance to combustion pressure than smaller molecules because of surface area. This is proved in Bernoulli's principle using different types of fluids. All atoms have pressure equal to the energy they store. Only 50% of fuel gets burned even in modern cars. Adam microedit@yahoo.com

Carl is absolutely correct. Adam rambles on about unrelated topics and makes no sense whatsoever. Neil