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

[Chris Pincetich]

OK, did some testing and ready to do more once I get help figuring it out! (IMG:style_emoticons/default/sad.gif)

With both power and fuel pump relays off the board I turned the ignition key to ON and there is power to the hole in the board for power relay pin #30.

With the power relay on the board and the fuel pump relay off and the key ON, there is power to the fuel pump relay holes in the board at #30 and #85, negative ground at #87 and #86 is a dud (neither power or grounding). BAD BRAIN!?!?!?

I removed the top covers to both the 12 and 14 pin connectors (thanx for that tip McMark (IMG:style_emoticons/default/beerchug.gif) ) to test for power to each of those circuits.

With the key ON, and both relays in the board, there is power at the 12-pin connector at #2 and #7, and in the 14-pin connector at #2, #3, #8, #12, and #14.

Not sure if this is proof of either the relay board being bad or the ECU brain! (IMG:style_emoticons/default/headbang.gif)

Could I do more testing on the relay board? I have many other relay boards I could bench test! I think there is a way to use my multi-meter to test each circuit's integrity??

Thanks in advance for more help (IMG:style_emoticons/default/beerchug.gif)