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1984 944 Fuel Pump Whine

Fuel System

Vehicle Information: Model(924/944): 944; Year: 1984; Engine (type, size, modifications): 8V A/C delete; Total Mileage: 105,000 approx;

I recently had the fuel pump, FP Reg., and FP filter replaced. I have noticed after driving 20-30 minutes the FP begins to whine and get louder. If I stop, turn-off the car and open the gas cap it sucks air in like a car that is on empty (car is full of gas though). When I restart the car the whine is gone until 20 minutes or so and the cycle repeats.I have replaced the gas cap, but no change. Is this a vaccum problem? If so what could be the problem/fix? Also, when whine begins I am assuming fuel pump is overworking having to suck in fuel, am I correct?

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