get two beeps & just quits when warm

[kevinp]

I have a 2002/03 21i R with Merc 315hp efi-when warm boat gives two beeps
boat keeps running most times and sometimes boat just stalls while driving which is a huge problems when inverted. Replaced PCM and worked good for a week then when it temp went over 30C 85F it runs for an hour then starts beeping and stalling. I have replaced all fuel filters, checked for obstructions-any one else having this problem and what to do as it is nice to use boat when it is hot. I have heard Merc has a new/better low preasure pump available. Any chance this could be electrical? Tige must build boats that can run all day in hot weather or why have a boat?

[dustinkim25]

I have the same problem

If it makes you feel any better my 03 21i is doing the exact same thing yours is and it is way too frustrating. I am in the process of trying to figure it out -have you had any luck yet? Please let me know.

[dogbert]

I'd have a service technician read the code. I had to replace my fuel pressure regulator on my Merc last year. My service manager told me that eventually it would have started to die.

[lee]

It is going into Guardian mode and the codes will need to be read and then cleared for it to stop.