Took the plane up tonight, on the first takeoff I heard an audible low fuel pressure warning. Everything felt fine, the pressure was fluctuating between 3.5-5.2 psi. On the next go round same warning but this time I felt a slight hiccup in the engine. The third time the same warning and the engine sputtered quick. Called it a day after that. When I was shutting down the engine I pulled the fuel pump fuse. The fuel pressure steadily dropped to almost 0 PSI. Can a failed electric pump starve fuel from the mechanical pump or is the mechanical pump my problem. Any thoughts, thanks, Joe