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JFairman JFairman is offline
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Join Date: Jul 2006
Location: S. Florida
Posts: 7,289
There is a switch on the back of the CIS unit next to the back side of the sensor plate and it turns the fuel pumps off if there is no air being sucked into the engine and the sensor plate at rest while the ignition is on.
It's a safety feature so the car won't burn down if you're in a bad accident and leave the ignition on.

Pulling the plug off it makes the pumps run all the time if the ignition is on.
Then it's easy to turn them on and off by touching the low voltage, non sparking overboost sensor wire to ground where the pumps will run, or leave it in mid air and the pumps shut off.

If thats confusing do a search on fuel pump wiring, overboost sensoer and relay circuts, and the blue fuel head safety switch or whatever they call it.
Old 05-08-2009, 03:44 PM
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