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Okay so you are saying you have power in and out of the inertia switch but yet the fuel pump does not turn on while cranking?
You need to check the power in and out of the switch while cranking the engine over, is that what you are doing?
Okay if you have power in and out of the inertia switch then check the power at the fuel pump connector while cranking the engine, if you have power there and the pump dose not run and produce pressure then that means the pump has failed.