Repair Safety Notice:
This information is for general instructional purposes only. Vehicle repair can be dangerous.
Verify all information, follow manufacturer service procedures, use proper tools and safety equipment,
and consult a qualified repair shop when needed.
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CARADIODOC
AUTOMOTIVE REPAIR CONTRIBUTOR
34,308 POSTS
The Engine Computer turns the fuel pump relay off when it no longer sees engine rotation. It knows that by the lack of pulses from the crankshaft position sensor and / or camshaft position sensor.