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2004 f115 hard starting

Im working on a yamaha f115 and it would crank up and run but after i shut it down it would not start back up and it got worse and worse now it will not start at all i know its some kind of fuel problem im wondering if it could be the primestart failing
 
Hook up a fuel pressure gauge to the fuel rail. See what the readings are. Disconnect the vacuum line from the regulator and try and restart it. If that fails pinch off the return line on the regulator and try to restart it. If it starts the regulator is bad. Just had the same engine with the same problem.
 
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