I drive a 1999 Honda Prelude and recently I found fuel in the vacuum line. So I replaced the fuel pressure regulator with a part bought from advanced auto parts and now I noticed a longer crank time under start up. Before, the engine would fire up within 2 seconds of cranking but now it takes a bit longer. I noticed that if I pressurize the fuel (engage the fuel pump) 5 times before starting, the cranking time is shortened! I was thinking to rent a pressure gauge to see whats going on but could it be that the part isnt genuine honda? Im not seeing fuel pump symptoms but I'm also looking at replacing the fuel filter since its overdue but this is a problem that wasnt there before replacing the fuel pressure regulator.
Read more: Could it be my fuel pressure regulator?