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Q: will not start cranks but nothing els on 2000 Mercury Mountaineer

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change fuel pump relay safety swich still in down position disconnected in line to fuel filter turned on key no gas
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Pretty simple test > Test for battery voltage present for 2 seconds on both wires at the inertia switch when key is turned on .. (Test one of the wires for battery voltage - cycle key again to check the other wire) .. IF voltage IS present on both of those wires - no further testing is required ... Replace the fuel pump!!
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