GT-40 Hard starting after sitting a few minutes

i'm having a little bit of hard starting issue with a '99 SAN with GT-40 engine. the boat fires up instantly when cold, just like it always has. this summer i've had some hard starting (cranking 4-5 seconds) after the boat has been sitting 10+ minutes. if i shut it down and immediately restart like with in a minute, it does so just fine.

i've changed the FCC filter and hose and did a full tune-up this spring (cap & rotor, plugs, wires). i also replaced both relays. i'm going to pull the anti-siphon valve tonight and clean it. could this be sticking open, draining the fcc causing it to turn over that long? it would seem to me there would still be fuel in between the fcc and injectors to be able to start on? plus doesn't make sense that it starts perfectly when cold. i also was thinking maybe bad coil when hot? that also doesn't add up that it would start immediately after shutting down just fine.

if cleaning the AS valve doesn't work, i'll go buy a fuel pressure gauge and make sure it's making enough pressure. anything else i need to try?

it's not that bad, and has not left me stranded, but it is fuel injected and the problem has just surfaced recently. it has just always started effortlessly and am thinking something is close to failing and would like to nip it in the bud before that time comes.

i never even though of that. i don't even remember if the GT-40 has fuel rails, but would pulling the injectors and cycle the ignition on diagnose that problem? stick a piece of cardboard under them to see if they are leaking?

You shouldn't need to crank since the pumps are electric. But, you will need to turn on the ignition to build initial pressure.

If you can update the subject to this thread, add "GT-40" to it. Then hopefully some more of the real GT-40'gurus will pick up it and chime in as well.