175 hpdi alarm

[lobster lew]

Just bought boat w/ 175hpdi.Took boat out for first time ran great for about an hour went to take off ,alarm goes off motor start rough idle like ther's fuel prob.Put her in neutral alarm still sounding shut her off, turnd key to start w/out starting her alarm still on.Checked oil res on eng, plenty there.Could only idle in.Any ideas?

[boats.net]

Probably overheat alarm, may need a new water pump.