i am making some progress. did vac tests in various places and got the fuel door working. it don't think it was leaking but the probe was gummed up in the guide. the system seems to be working, now when i start the engine all the locks work together...which it didn't do before. if i let the car sit a few hours the locks still work together without having to start the engine. i think i have a leak in the blue line going to the seat backs, but i'm not sure. i assume that the system is to lock the seats when the engine is running unless you puch the small black button on the side of the seat? the line does not hold a vac at the firewall. it seems hard to get at under the seats, do you guys just unbolt the seat? thanks again!