Engine stalling problems again...
 

So last summer with engine stalling problems we had it services and was determined the injector pump was faulty, causing the engine to run lean and run hot and vapor lock. We had it out a few weeks ago for 8 hours with no problems.
Yesterday we drove about 20 minutes from dock to stop and swim. Decided to cruise around after about an hour and after starting back up again and throttling up to plane she stalled out and died and would not fire back up. Very frustrating.
Would I be correct possibly in thinking fuel pump is bad? I haven't had a chance yet today to work on it. Is there a valve to attach a gauge to check fuel pressure?

Thanks for any help.