Re-connecting battery with engine/trans harness unplugged

[lifespeed]

As the subject says, I would like to connect the battery to the car while the engine is out with the engine and transmission harness unplugged. I imagine the PCM won't like the missing sensors, etc.

Are there any potential problems connecting the battery with half the wiring harness missing? I need to pump out the fuel tank. I imagine the PCM won't operate the fuel pump with the fuel pressure sensor missing, so I'll have to jumper it in the trunk.

Or I could just ground the battery, and jumper 12V to the fuel pump without turning on the car wiring. Maybe that makes the most sense?

[justbob]

I've never had an issue doing it, usually to gain access to the trunk as my key hole is a camera.


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[Spectragod]

If you feed 12v into the pump, you will back feed the whole car, I would just power it up from the cables up front.

[Turbov6Bryan]

Just add a fuel stabilizer and it'll stay fresh

If long term storage, i always do it with a full tank. No chance of the tank rusting out

[lifespeed]

I jumped pins 3 and 10 to GND and 12V (check the schematic if you want to try this, don't trust my memory) in the trunk, pumped the tank dry in a few minutes. Have to put the big Walbro in now. I did not connect the battery to the battery cables, chassis or use the Fuel Pump Driver Module. Used a 10A inline fuse just to be safe.