My '80 thru '87 service manual on page 65 section LD shows that the fuel pumps are connected at some point to whats called a CBHC connector. The problem is that I cant find it! Its not in m yparts manual and they dont show you were it is. This is one of the last things I need to test to determine why my fuel pumps will NOT run unless powered by a seperate power supply. Weve verified voltage throughout most of the system. The fuel pump relays, the rpm relay, the inertia switch, fuel pump fuses, and even that pesky overspeed module appear to be sending the correct 12 volts while cranking so its not likely any of those items. I even replaced the RPM relay with a new one just to try it. Car throws a massive spark so its not that. We have also verified that the connector sockets for these items are not damaged in any way and show correct voltage.
This problem started after replacing the battery & tightening the alternator belt which did involve removing the airbox. Weve checked all of the obvious "maybe you knocked this loose or that loose". Its beyond that, Im afraid.
Like I said, she starts and runs like a beast..... with the fuel pumps wired directly to the battery
Otherwise, it just cranks but power is not reaching the fuel pumps. This is really a tough one to sort out!
Thanks for any help on that CBHC connector and its location - I need to find that sucker!