Losing rpm on port engine only.

[mrt214]

Ok guys here we go, I have twin 350s and 1 fuel tank. I am losing rpms on port engine only when I throttle up to 4500rpm. both engines run at 3000rpm but this is not enough for this boat. I have replaced these items so far.

1. Both water seperators
2. coil on port side
3. fuel filter inside carb on port engine

Now I am contemplating changing cap wires and rotor. I am open for suggestions.
Boat has 435hrs 1996 Maxum 3200SCR

[mmwjr]

When you say losing rpms do you mean it gets to 4500 under load and then drops off?

Check fuel pressure should be 6-7 psi.

[mrt214]

yes it is when under load getting on plane then engine rpm drops. I have considered the fuel pump.

[mmwjr]

Originally Posted by mrt214

yes it is when under load getting on plane then engine rpm drops. I have considered the fuel pump.

Since you replaced the filters this is what I would check next as I would think its fuel related and not electrical as it makes power then drops off shortly after.

[mmwjr]

After checking the fuel pump I would look into a carb issue such as a float issue causing the carb bowl to go low.

[mrt214]

Yeah what the hell it's only money. haha

[mmwjr]

And as long as it's your money I am willing to spend it.