Yamaha OX66 250 VST cleaning

bonedaddy · 10-07-2008, 11:18 AM

I was out on Sunday and running about 4800 RPM everything was fine and all of the sudden the boat just lost power. It didn't shut off, I gave it gas and took off again (this hppened 3 times total). I have read that my motor has a Vapor Seperator Tank that could cause the motor to loose fuel pressure if it is dirty. Does anyone have any suggestions or know how hard it is to clean this tank?

DOUBLE "D" & LV · 10-07-2008, 11:55 AM

There is a drain on the side of the VST. If you check it for water and none comes out, you may have to open the VST. If you do, you need to get a new o-ring for the cap and I would recommend getting a new filter inside of the VST. HOWEVER, I WOULD HIGHLY RECOMMEND MAKING SURE IT IS THAT BEFORE OPENNING IT UP. I have found that there are a lot of other issues to cause what you described. If your primer bulb goes flat, you have a restriction before the bulb; if the primer bulb seems to leek down, you could have a ruptured diaphram on one of your fuel pumps; there is a check valve on the engine that can stick and cause the engine to die; a loose fuel line connection can cause it. I only say this because the VST has your electric fuel pump in it and the VST is full of fuel. If you are not careful, you may get into more that you want. The VST is not hard to do if you pay attention and put it back without damaging anything. Call me if you need more info.

Sequoiha · 10-07-2008, 12:08 PM

All good info David,,,,, I can take care of it for you as well....:usaflag

Bowed Up · 10-07-2008, 04:10 PM

O2 sensor port clogged?

Wooly Bully · 10-08-2008, 10:30 PM

could also be 1 0f 3 fuel pumps.. if one of the fuel pumps has a tear in the diaphram, it will cause the same thing.. had to replace all of mine and it cost about 130 bucks.. hope this helps

bonedaddy · 10-09-2008, 12:14 AM

Thanks to everyone for replying, I am going to have it looked at next week!

10-07-2008, 11:18 AM	#1
bonedaddy Member Ruby Red Lip Join Date: Sep 2008 Location: Milton, Pace area Posts: 53	Yamaha OX66 250 VST cleaning I was out on Sunday and running about 4800 RPM everything was fine and all of the sudden the boat just lost power. It didn't shut off, I gave it gas and took off again (this hppened 3 times total). I have read that my motor has a Vapor Seperator Tank that could cause the motor to loose fuel pressure if it is dirty. Does anyone have any suggestions or know how hard it is to clean this tank?

10-07-2008, 11:55 AM	#2
DOUBLE "D" & LV Senior Member Grouper Join Date: Oct 2007 Location: pensacola Posts: 863	RE: Yamaha OX66 250 VST cleaning There is a drain on the side of the VST. If you check it for water and none comes out, you may have to open the VST. If you do, you need to get a new o-ring for the cap and I would recommend getting a new filter inside of the VST. HOWEVER, I WOULD HIGHLY RECOMMEND MAKING SURE IT IS THAT BEFORE OPENNING IT UP. I have found that there are a lot of other issues to cause what you described. If your primer bulb goes flat, you have a restriction before the bulb; if the primer bulb seems to leek down, you could have a ruptured diaphram on one of your fuel pumps; there is a check valve on the engine that can stick and cause the engine to die; a loose fuel line connection can cause it. I only say this because the VST has your electric fuel pump in it and the VST is full of fuel. If you are not careful, you may get into more that you want. The VST is not hard to do if you pay attention and put it back without damaging anything. Call me if you need more info.

10-07-2008, 12:08 PM	#3
Sequoiha Senior Member Sailfish Join Date: Sep 2007 Location: Pensacola Florida Posts: 2,477	RE: Yamaha OX66 250 VST cleaning All good info David,,,,, I can take care of it for you as well....:usaflag __________________ Kenny Mann Ms Penny Fishing Team Member NRA 172499461 Minn Kota ASC Dealer for The Super Stick www.thesuperstick.com Emerald Coast Marine LLC Allmost Anything Computers 4610 Saufley Field Rd Pensacola Fl, 32526 1-850-456-8196 1-850-455-8318 Sequoiha@cox.net Kenny_Mann-ECM@cox.net

10-07-2008, 04:10 PM	#4
Bowed Up Senior Member Snapper Join Date: Oct 2007 Posts: 530	RE: Yamaha OX66 250 VST cleaning O2 sensor port clogged?

10-08-2008, 10:30 PM	#5
Wooly Bully Junior Member Cigar Minnow Join Date: Oct 2007 Posts: 12	RE: Yamaha OX66 250 VST cleaning could also be 1 0f 3 fuel pumps.. if one of the fuel pumps has a tear in the diaphram, it will cause the same thing.. had to replace all of mine and it cost about 130 bucks.. hope this helps

10-09-2008, 12:14 AM	#6
bonedaddy Member Ruby Red Lip Join Date: Sep 2008 Location: Milton, Pace area Posts: 53	RE: Yamaha OX66 250 VST cleaning Thanks to everyone for replying, I am going to have it looked at next week!

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