"MPI" Fuse blows with key off?

[polishmafia]

Check for wiring that has frayed. Its going to be time consuming, but I'd check the wires to the starter, alternator, O2 sensors and fuel pump first.

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I've had an MPI relay vibrate enough to somehow short itself out internally on its own metal casing. Looked good from the outside but when I took it apart you could see where it arched out.

Quick easy check