E150hp FichRam MY2001 Engine loose rpms

[Poleposition]

Just put the boat in the water, early spring in Sweden, Scandinavia...

Starting the engine is no problem.

But when running at 3000rpm the engine suddenly loose some rpms for a second and then run normally again.
I can run 15min with no issues, then all of a sudden a "jump" occurs again.

Why this? Water in fuel issue after winter? Or is this engine battery-current sensitive, bad battery?

Thanks in advance!

[boats.net]

Might drain the vapor separator tank into a clear bag and look for water or trash in fuel, Check for loose or dirty battery cable connections, check wire connections on engine.
May need to run it with fuel pressure gauge attached to see if fuel pressure is dropping.

[Poleposition]

Thanks for info S.M. Wheres the vapor drain located?

[boats.net]

It's at bottom of fuel vapor separator tank, the tank with electric fuel pump in it on side of engine.

[Poleposition]

Hard to discover, but found a leaking fuel hose...just a small drop. Changed the fuel hose, new clamps, problem solved

[boats.net]

Great, small leaks can be hard to find, glad you found and repaired it.

[Poleposition]

I have also drained and cleaned the VST tank. Ready to test again. Do I need to drain air in a certain way on the High pressure side? There is a kind of bycicle valve loated on one hose, is that the air bleeding thing?

[boats.net]

No it will bleed itself just check for fuel leaks.