Why do I get drawn to these kinds of threads?? Hmmmm. Anyway I don't have that car but that symptom is very curious. On my car I don't even think I can hear the fuel pump. What exactly is the sound you hear? I hate guessing but perhaps it could be the OVP. In any case I would suggest doing some searching. Here is a recent thread I found about the OVP on your car. Hopefully someone else has something more insightful to add. http://www.peachparts.com/shopforum/showthread.php?t=230781&highlight=190e+ovp

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1998 C230 330,000 miles (currently dead of second failed EIS, yours will fail too, turning you into the dealer's personal human cash machine)
1988 F150 144,000 miles (leaks all the colors of the rainbow)
Previous stars: 1981 Brava 210,000 miles, 1978 128 150,000 miles, 1977 B200 Van 175,000 miles, 1972 Vega (great, if rusty, car), 1972 Celica, 1986.5 Supra