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You don't. You just crank the engine until it starts. Modern vehicles work on a pressurised system with a return back to the tank. The fuel is pumped from the tank to the injectors and excess fuel is returned to the tank.
Not getting proper fuel. There are two coolant temperature sensors one for the gauge. one for the computer. the one to the computer monitors fuel. When it fails the engine is slow to start the first try and there is a strong odor of gasoline. The engine will run rough at some speeds and sometimes stall.
To solve the problem, drain all of the diesel fuel out of the gas tank and refill it with gasoline. (If possible open the fuel line near the injectors, place a flexible tube of some kind over the fuel line and drain enough fuel to allow all of the diesel fuel to be removed. Get as much of the concentrated diesel fuel out of the line as you possibly can before attempting to start the engine.) Then you would have to keep cranking the engine for a while to get the diesel out of the fuel lines and the injectors. Eventually the engine would start and run fine.
try your MAF which is on the intake pipe with the black box that is screwed down the sensor gets dirty and doesnt read as it should.There is a how to remove and clean on utube with an older mondeo try that
If a diesel, you might check the diesel pump drive belt (at the right side of engine when looking at the engine from front of car). It's possible the teeth on the belt have stripped and put the pump timing out. An alternative may be a "stop solenoid" failure. The solenoid stops diesel getting to the injectors when the "ignition" is turned off and "stalls" the engine.
I don't know if the injector pump on a petrol engine has a similar setup as a diesel but it might be worth checking.