trouble starting

[two99fiveO's]

My 99 5.0 cranks strong but takes 3-5 seconds to fire up. the plugs, wires, fuel filter are new. any suggestions?

 

[dogfriend]

Next time you start, instead of turning the key to start, just turn the key to the "on" position and leave it there for 5 seconds before turning it to "start". If the engine starts immediately, then it might mean that you are losing fuel system pressure and it is taking 3 to 5 seconds before pressure has built up enough to start each time. This would be caused by a bad check valve or a leak in the fuel system. I believe the check valve is part of the fuel pump assy.