1989 Acura Integra Raw Fuel Smell & whine noise from FI

Notes: Injectors & seals have been replaced. Engine runs perfectly cold & hot - no sputter or symptoms typical of an overly rich mixture. Fuel mileage is excellent - 27-36 MPG so the excess fuel isn't sustained. Only 99K original miles. Have checked for leaks from fuel tank & along undercarriage from fuel line. No leaks evident around fuel filter. Actually no fuel smell under hood at all while running.

1.) Raw fuel odor when car first started - doesn't come from under hood - think it comes from exhaust. Engine runs perfectly - no sputter, choking, etc. Odor disappears immediately. Worse when car is cold, but sometimes occurs when warm, too.

2.) Whining sound from fuel system area at idle speed while in DRIVE - Can't pinpoint location - could be one of many dashpots that is leaking vacuum. The sound stops when increasing engine speed even slightly. Also removing hoses from various dashpots increases speed and sound stops.

Could a failing dashpot cause the excess gas injection at startup? If so, which dashpot is likely culprit. Or is it possible an injector is leaking gas into cylinder when engine is turned OFF & then that gas passes through unburned and odor detected at tailpipe when the car is re-started?