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Yes that's correct.I am guessing that you have an F115 four stroke and not an 115 two stroke. Is that correct?
injectors were serviced last year, I might did 10 -15 hours after the service.The pressure regulator is plumbed to the intake manifold. So that manifold pressure is applied to the regulator.
Prior to start, the manifold pressure will be as high as it will ever be. As will be the fuel pressure. Upon starting the motor, the manifold pressure goes down and so too does the fuel pressure.
If the motor won't run with the pressure regulator being plumbed to the intake manifold, but it will when the regulator is not plumbed to the intake manifold, (resulting in an excessively high fuel pressure) I might guess that the fuel injectors are somewhat clogged. At the normal fuel pressure they won't allow enough fuel flow for the motor to operate. But with an excess fuel pressure they might.
When were the fuel injectors serviced?
So key on motor off about 40psi,idle about 35psi.Put a gauge on the fuel injector rails and see what the fuel pressure is. Key on motor off. Key on motor running at idle. Key on motor running at mid throttle.
