Resident 1.8 L-jet experts, a little help please... Options

[Blue6]

My 1974 1.8 completely stock has a problem. Every couple of days it will only stay running about three seconds. No mater how many times I try to start it, it just runs for three seconds then dies. Other days it will run great.
I checked the power to the fuel pump, and get 10.86 while cranking. When I plug the fuel pump back in and crank the engine, it doesn't do anything. No noise, no vibration. I removed the pump and jumped it with a battery, and it spins like it should. What am I missing. Thank you...

[timothy_nd28]

Grab a voltmeter and set it for DC. Put the positive meter lead on the positive battery post. Insert the negative meter lead on pin 88d of the dual relay, should be a big black wire with red stripe. With the car off, you should be reading a solid 12 volts. Monitor the voltmeter when cranking and with the engine running, you should see 0 volts. Anything higher than 0.5 volts would indicate a resistance drop internal of the relay and should be replaced.

It's also worth checking if the fuel trigger points inside the airflow meter are working. With the ignition switch set to on, deflect the airflow meter flap. You should hear the fuel pump engage.