Well you did good, you proved the relay wasn't the problem. You still must decide whether there is enough fuel pressure.

About the only way to do this without gauges is to remove an easy injector with the fuel line attached and bypass the relay as you have. First view that NO fuel should flow from the injector with the motor not spinning.

Next, place a finger on the airflow meter and push down. Fuel should flow in proportion to how far you push. If not you have found a problem.

If there is fuel flow you still must verify that the mixture is acceptable. Crank the car and once running (you did say it ran for a couple seconds) press gently down on the airflow meter. Try and add fuel as the car dies. Try to find a spot where the mixture is best by moving your finger gently, smothly, slowly up and down. This of course only works if your are too lean to start with.

Verify that the frequency valve is buzzing when the car is cranked and during the brief running.

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Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician