HELP-It's alive with no key in car

[boost135]

I isolated an overnight battery drain on my S14 with redtop SR swap down to the 7.5 amp fuse under the hood for the EGI circuit. With the key out of the car, I can hear the ECU coming on when I replace the fuse after I pull it. The fuel pump does not come on , though.

One thing is that my ignition switch is kind of flakey. The turbo timer and stereo don't come on until the switch is turned back from the run position just a hair. Do you think this switch might be engergizing the ECU with the key out?

The car has a 255 walbro pump in it. I have had a lean issue under higher boost with my chip tune and 520cc injectors. Voltage was on the low side at the pump under boost, in the 11 range, but fuel pressure seemed to check out fine. So I'm hoping whatever this problem is that fixing it will rich my mixture up a bit too.

What wiring, relays etc. should I be checking next, and for what?

Thanks for anything you guys can guide me on..

[vancouverbc]

look up ignition in tutorials. maybe disconnect it to see what happens.

[boost135]

I'm finding some threads that mention a wire to the ECU that keeps voltage going to it all time to keep memory.

I should ask, on everyone's car, if you pull the EGI fuse with the key out, does the ECU power and de-power itself?

Thanks for linking the tutorials to me. I didn't know about them.

[vancouverbc]

I'm finding some threads that mention a wire to the ECU that keeps voltage going to it all time to keep memory.

I should ask, on everyone's car, if you pull the EGI fuse with the key out, does the ECU power and de-power itself?

Thanks for linking the tutorials to me. I didn't know about them.

ecu always has power . it would lose its self learning if you denied it power for more than a few seconds. it only uses small amount of power.