1987 audi 5000cs intermintent start Fuel pump

[audifan4evr at aim.com]

hello i have a 1987 5000cs. my problem is that i am not getting power to my fuel pump all the time. for instance it will take two to four times of on off start before i can here my fuel pump run. when this problem first started we did not have spark either. but i am assuming that is because of the pump not being powered. i have ran every single electrical test in the book and everything checks out. i also swapped distributers,crank case sensors, ecu's and many many other things including the ignition switch. i do have a bosch 044 fuel pump and a fuel cell in the trunk. baiscally my question is does anyone know what controls the power sent to the fuel pump. the original wiring for the original pump now goes to the inline Bosch pump. i have been stumped for weeks and have found nothing. please help