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It must be that its early in the morning, I have'nt had a cup of coffee whatever but Im good with the ruling out of the house tank/lines. The HP pump was replaced and as I said earlier the boat ran good that next day but half way through the second day the problem reoccured. The mechanic pulled...

I will make sure any hose used are Yamaha OEM parts. When I used the portables I did bypass the inline pumps.

I have rev'd. the motors at the dock in neutral and they rev. easily up to 4000 rpms. Actually both motors have no problem rev'g. up to 4000 but his is not under load which is what the mechanic tells me is where the low rpm issue comes into play.

After using the portable tanks with New Fuel I realized that I was just sending the new fuel through an already clogged system within the motor and the motors ran the same. So to me this did not rule out the house tanks and fuel lines. I think to rule out the house tanks and lines would you not...

The reason for replacing the fuel lines is do to the age and the symptoms the motor is having. I also think there trying to eliminate another possible problem. When I ran the portable tank the motor still ran bad. I think this is do to the fact the filter most have been clogged and I was just...

The original mechanic stated that to protect the motor that is running fine and not put undo strain on it when the other motor is having issues it will not exceed a certain rpm. The problem occurs every time you run the motor and the rpms do not fluctuate they just max out at 3500. But in the...

I just spoke with the marine and was given the work order and there plan of attack. First item, Disassemble VST tank, check filters/screen and clean as needed. NOTE, this was done once already by the first marine and the High Pressure fuel pump was replaced. Also while VST tank is disassembled...

Milford CT.

The port motor is the more noticeable of the two but the starboard motor during all of this will not exceed 4000 rpm. It to will drop off if you try to exceed 4000 rpm. I was told by the first mechanic that this is typ. when one motor drops off the other will not compensate and will stay at a...

The portable fuel tanks were connected directly to the motors and the same results occurred with the low rpm. I have not tried running the boat with the fuel caps off. We did check as best we could any blockage within the vents overflow and it appeared clear.. One of the possible fixes as...

The portable tank was run with both motors but only after I took the boat out running on the house tanks to make sure the probably was occurring. I then came back to the dock and connected the portable tanks directly to the fuel filter supply. The issue with this test is if there was debris in...

The corrosion that was mentioned to me was viewable at the top of the block through the thermostat housing. I'm told it is do to the steam generated from the heat of the motors and it settling at the top of the block. The mechanic showed me the same type of engine with a corrosion issue which he...

Here is a short history of the boat and motors before explaining my problem. I purchased this boat in 1996 and am the second owner of the boat. I replaced the 2 stoke motors in 2003 with 2002 Yamaha 4 Strokes. The boat and motors have been yard maintain for most of the time. Since I have owned...