1. The Motor
was rebuilt in 2013, along with the injectors and high pressure fuel pump.
2. All new hoses double clamped along with all new cooper
washers from the tank to the injectors including the fuel return back to tank.
3. With engine running, cracked each cylinder at the injector to see if the miss was high pressure pump, or injector related. Not. The miss was still there on any 2 cylinders.
4. Vacuumed air vent to fuel tank and found a partial blockage there. Water
the boat. Avoid spraying water
in the air to tank intake.
5. Removed fuel return line at tank to injectors and blew out any possible clogs there.
6. Bypassed the Racor filter. Not it. Reconnected.
7. By passed the lift
pump with gravity fed fuel. Not.
8. Took of the mixing elbow and was found to be clear.
9. Loosing my patience at this point.
10. After all this and 3 days later I decided to run the motor
for an hour at different RPMs to try and clear all the lines after everything I've done.
The Shudder/Miss was still present.
11. While coming back to port on a windless day I put in this stuff you can get at Canadian tire called SEA Foam into the fuel tank. Ran engine at 2900 RPM for 2 hours. The next day the engine fired in 2 seconds and the shudder was gone.
I don't know, you tell me.