1972 1.7 - Fuel pump not starting when key is turned, Problem with fuel pump Options

[itsmagic]

My 1972 1.7 914 recently decided to not start. I quickly noticed that the fuel pump is not running briefly like it should after the ignition key is turned. I verified that the relays on the relay board (Master, Fuel Pump, Blower) are all good by trying them on the headlight motors. I then verified that the two fuses on the relay board are good. Next, I popped the cap on the fuel pump relay and pressed it... the fuel pump runs when I do this. (The car will then start and run for a few seconds if I start it). Sooooo, I am at a loss... The fuel pump is fine, relay board is fine, relays are fine... what could be causing the fuel pump to not activate? Thank you for any advice. Wayne

[Tom]

You can narrow down the search some by doing the following. Using a jumper hooked to ground on one end and with a thin piece of solid wire ( a paperclip would work) on the other, turn on the key switch and put the wire/ paperclip from the jumper to the #3 connection on the 4 pin plug which is located at the lower left of the picture posted above. The ECU provides a ground to pin 86 of the fuel pump relay, allowing it to energize and close the contacts to provide power to the fuel pump.
If the above test is satisfactory, you are losing the ground signal from the ECU. Pull the 4 pin connector and check the terminal on the wire for pin #3. If that is good, you are going to have to remove the connector at the ECU and see why the signal is getting lost, may be a bad terminal on the wire or bad solder connection on the connector at the ECU. You can use your multi-meter on the ohms scale to check from the ECU connector to the 4 pin connector. Should be less than 1 ohm.
Tom