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Charles, Marine Mechanic
Category: Boat
Satisfied Customers: 3873
Experience:  US Navy (Ret) Certified Mercury Marine Tech with over a decade of repair experience.
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I have Sea-Doo Sportster LE DI, 2004. The problem is that

Customer Question

I have Sea-Doo Sportster LE DI, 2004.
The problem is that the engine reach up to 6K RPM when started on idle speed.
It doesn't respond to accelerator.
Everything was ok when i came from ride.
I flushed engine with fresh water as a routine procedure.
Engine was idling fine when I stopped it.
Next day I've tried to start it on trailer before go to trip.
It started on crazy RPM. 5.5K.
I've checked.
1. Intake to see if throttle is not wide open.
2. Cleaned 2 exhaust rave valves.
3 Cleaned air pressure regulator. It was dirty with water/oil emulsion
4. Checked all possible air leaks and didn't find anything.
Submitted: 1 year ago.
Category: Boat
Expert:  Charles replied 1 year ago.

Hello, my name is***** will assist you.

Expert:  Charles replied 1 year ago.

Remove the fuel rail from the engine mounting, leaving all connections connected. Turn the key to on. Look around the fuel injectors to see if there is any fuel leaking from them. If so, they should be cleaned. It is possible that a torn diaphragm in either the fuel or air regulators would also cause the engine to rev very high like this.

Customer: replied 1 year ago.
Charles, I was not able to view your answer earlier and conduct the routine you suggested because i had emergency business besides my boat, therefore sorry for delay.
I understand that there is three possible problems.
1. Injectors leak.
2. Fuel Pressure Regulator causes excessive fuel pressure.
3. Air Pressure Regulator causes excessive air pressure.I can visually inspect injectors as you described.
I can disconnect return fuel line to see if FPR functioning properly.
Do you know how to check if APR is ok?
Thank You
Expert:  Charles replied 1 year ago.

If you can find a good location in the system to install a gauge that would be the best way to see if the regulators are functioning correctly. I could not locate a test point in the diagrams.

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