My 91 civic has recently started having a hard time starting when warm. The car starts like normal after it has been sitting but doesn't want to start after I have been deriving and shut it off for 5-10min. I believe that the fuel pump is going (353k miles). I changed out the igniter, cap&rotor, and coil a few months ago tracking down a starting problem when it was raining outside(car had to be cold) so I know that the problem is none of these components. The car runs great when warm as long I I do not turn it off. I have also noticed that the car will start hesitating and misfiring after shifting up to the next gear while accelerating. I replaced the fuel pressure regulator today and it was not the problem. Am I right to think that the fuel pump is the problem? I do hear the fuel pump when I turn the key and the car does not smell flooded during the hard time starting.

 

my 91 civic is having the same problem. Did you solve your problem? What was it?