1996, Audi A4 Quattro 2.8 Manual, 248.000km (around 150.000 miles)

Problem:

Not Starting, Cranking, but NOT starting.

The car just staled on a stop sign. Few minutes before it stalled it start running crappy and lost power, like I downshifted from 3rd to 2nd and like it was running on 3-4 "cylinders" instead of 6 (little bit louder then usual).


Replaced:

Fuse checked. Fuel pump REPLACED.
I have a no knowledge if the fuel pump relay works. Relay number is 8A0951253B (208 on the top). Is there a way to check it if the relay is OK? I have the relay pulled out and ready to buy one, but what if it's NOT the relay. I have a Multimeter, so is there a way to
check if the relay is OK or is it possible that is the fuel filter? Fuel filter should be OK tho, because it was replaced about 4 months ago. (the old one corroded and start dripping fuel). If the relay is OK, is there any way I can check to see if fuel goes to the engine? Or could be some "other" problem with my car.

Any suggestions and help appreciated.

Thanks,