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Explain how injectors work without solnoids on them

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Pre-CR the injectors were fired by fuel pressure. The pump would pressurize the fuel in firing order (why pre-CR pumps are timed, and a CR isn't). The fuel would reach "x" pressure (300 bar comes to mind, or ~4500 psi) the fuel pressure would overcome the spring pressure and the injector would open. The fuel pump would send a specific amount of fuel to each injector and as soon as the pressure dropped below "x" the injector would close. This is also why the injector lines on pre-CR trucks are equal length, and why they are different on a CR.

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