GT-40 Hard Start When Hot

Could anyone shed some light on a starting issue I am experiencing? Boat starts great when cold and runs great all day. However, after sitting (5+ minutes) when hot it will take a while to turn over (3-5 seconds) and barely wants to start at times. Has not left me stranded, but it's definitely noticeable. I've already changed the fuel pressure regulator and low pressure fuel pump.

http://correctcraftfan.com/forum/forum_posts.asp?TID=36112&KW=&title=gt40-fuel-pressure

Barley turn over? Or Barely fire up and run? If the first your starter is dragging worn and is pulling to many amps and turning slow or your Battery is weak.. If the later your Ecm/fuel relays could be suspect if your Spark and fuel pumps checked out ok.. I recently had a extended hot start crank issue on my 99 gt40 and replaced my Fuel pump and Ecm relay's and it fixed my issue.. They are standard old school ford relays.. Duralast/Auto Zone # 19272 if you wanna do the local parts route..

Dylan, Sounds like your in the same situation I was, I'm IMOP the Gt40 is one of the best motors PCM has ever produced and many on here will say the same.. Although it does have its quirks/common issues like any other engine.. Make sure both low pressure and high pressure pump prime when u turn the key to Start postion.. Sometimes it's best to actually put your hand on the low pressure pump to feel it buzz because it can be muffled by the HPFP.. Do you have a Spark checker? If so check spark when your engine fails to start.. If the spark is weak your Coil could be going South or the Ignition module.. but the Module's on these motors harldy ever fail.. Its almost always a fuel pump or relay issue on a hot/soak starting issue...like I said switch the ECM and Fuel pump relays out.. I would also recommend reading the Poor Man's gt40 diagnosis on here.. It's a sticky thread

Anything is possible-switch them around one runs the pumps the other the ecm. I always carry spares of them in the boat. Ever change the distributor?