Quote:
Originally Posted by Orv
It's a positive displacement type pump, which means it moves a fixed volume with each stroke and the pressure will rise as high as necessary to let that volume flow. With no resistance to flow there won't be any pressure. With the lines sealed, the injectors block the flow until a certain pressure point is reached, then they "pop" and let the fuel out.
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I used to think the same. There is a thread that go deep into the subject of the positive displacement. I believe it was Numbercruncher that disproved that.
The argument over that was hot enough that ForcedInducton got banned.
Apparently the Piston is pushed positively in one direction against Spring Pressure but on the way back the Spring Pushes the Piston. This means that that if the Outlet of the Fuel Supply/Lift Pump was Plugged the Piston being pushed back under Spring Tension would not move until what is blocking the Outlet is removed.