From the thread title..."no start when warm".

My guess would be the accumulator.

New fuel filter is not a bad idea, since you need to pull the whole fuel pump/fuel filter/accumulator assembly in order to get to the accumulator.

http://s1377.photobucket.com/user/lesterl/media/Fuel%20Pump%20Misc%20020517A_zpscghizk54.jpg.html?o=0