Nissan Repair: Hard to start, nissan 240 sx, head gasket

Question
Have a Nissan 240 SX 1990, when the engine has rested for about 20 minutes I must pump the gas pedal many times as I crank the engine to get it started ( it can take about 10 seconds). The dealer thinks that there is 1 or more injectors that leaks once the car stooped and floods the engine. The car has 120 000 Km. An other Nissan dealer changed the head gasket to try to solve the problem with no luck. Other that that it is in good condition. thanks.

Answer
Daniel,

Yes, my bet is on the injectors.  You can verify this by putting a pressure gauge on the fuel system and watch the fuel pressure when you turn the engine off.  Check and watch the pressure fall.  Also, you can see which cylinder is associated with the bad injectors by checking the spark plugs.  The ones that are black are where the injectors are going out and leaking and the ones that are gray are fine.