Please help me anyone!

Hi i just bought a 1990 190e 2.6 and ive been loving every minute of it. when i bought the car there was a quarter tank of old gas and it wouldnt start i siphoned old gas and replaced the filter and the pumps. it was driving fine for two weeks until today i stopped at the gas station and it wouldnt start up again its cranking no fuel is getting through i cant hear the pumps kick on anymore. i dont know what to do because they are both brand new. any ideas please tell me im at a loss