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The fuel injector rail takes its fuel supply from the fuel pump through a pressure regulator that makes sure the right amount of fuel exist in the rail all the time. This is so that each injector gets a consistent amount of fuel, and that the only variable to determine the amount of fuel injected would be the injection pulse supplied by the Electronic Control Unit. This configuration simplifies the process of controlling engine speed. The rest of the fuel from the pump above the required rail pressure is returned to tank through an excess pressure outlet in the regulator. This makes it necessary then for the fuel pump to not just squirt out fuel but it must meet the specified fuel pressure in the rail. You should find this data in the shop manual for your car.

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Q: Ive got a1992 Mitsubishi space wagon glxi witch will not start ive got a spark at the plugs and fuel pump is fine think its something to do with the fuel injector rail what makes the rail work?
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