Originally Posted by Michaelr227
The relay is powered by the computer module for a few seconds when u turn on the ignition switch, then or after that the PIP inside the distributor kicks in the signal to the computer.
If the relay is not getting power check the terminals on the plug ( the power that closes the circuited in the relay). Need to know how the relay works?
Close, actually, the primary winding (control circuit) of the fuel pump relay is powered from the EEC relay secondary, all the EEC does is provide the ground which energizes the primary allowing the secondary to close which in turn sends power to the pumps.
Power for primary side of the EEC relay is provided from the ignition switch in the run position, it uses G100 as a ground. The relay secondary uses Fuse Link N which is off the hot battery bus, when the relay closes, power is sent to the EEC and S122. S122 powers the fuel pump relay as I mentioned above.