I have a 2007 60hp 4 stroke efi that keeps losing fuel pressure. I can turn the ignition on and get 42psi at the VST schrader valve. I can run the motor for anywhere between 1 minute and 1 hour at normal speeds under a load with no loss of power and then the fuel pressure will drop to 5 psi then start bouncing between 5 and 30 until the motor stalls or I turn it off. If I turn the ignition back on I will have 42 psi again, engine will start right back up and the process repeats itself. I also occasionally get a 6 beep alarm, at startup only, although this does not happen every time. There are no stored codes. The primer bulb stays hard throughout the process, pumping it has no effect on the issue. I also have 13.6 volts at the electronic fuel pump at all times, even when the fuel pressure drops. I have changed the electric fuel pump in the VST twice, the mechanical fuel pump, fuel filters, drained and cleaned the gas tank multiple times, connected an external tank directly to the canister fuel filter, all with no change.
Any suggestions would be appreciated. Thanks in advance.
Any suggestions would be appreciated. Thanks in advance.