Major Oil Problem

cptskinny · 11-29-2008, 09:19 AM

I have a 2000 Yamaha 150hp carborated 2 stroke. It has a small oil tank on the motor, quart or less, and a 2 1/2 Gal main tank, that supplies oil to thesmall tankon the motor. The problem is oil is pumping all the time. Engine smokes and oil is all over the inside of the cowlingand will drain out if the motor is tilted up. Makes a slick on the water. I have had the switch replaced that supposedly shuts the pump on and off to keep the oil between the two lines on the small tank. This did not solve the problem, it still does the same thing. Would appreciate any suggestions for what else could be causing this problem. I had another oil problem a couple months ago, but that turned out to be the plastic turnbuckle on the end of the rod that wentonto the oil pump. Fixed that and had one good trip before this happened.

Thanks

Cptskinny

xl883lo · 11-29-2008, 10:16 AM

Go to The Hull Truth and search for "making oil" IIRC this is a common problem for certain models and they had several threads about it.

Bowed Up · 11-29-2008, 10:48 AM

Check the barrel fuse on the side of the motor near the solinoid.

sosmarine · 11-29-2008, 10:55 AM

Are you saying the pump in the Aux tank (2.5 gal) is constantly pumping oil to the main tank on the motor? There are a couple of things it could be, float switch in the main tank, short in the wiring, or bad computer. Glad to look at it if you are near Navarre.

metal11 · 11-29-2008, 11:01 AM

When you say the motor smokes, do you mean more than normal or that it just smokes. If the pump is running all the time it will over flow the tank on the motor and SOS is right about a short or bad float switch. Need to know exactly what it's doing before we can help much.

The Maintenance Shoppe · 11-29-2008, 12:51 PM

You have a bad oil tank level sender or oil monitor computer, or bad trim sensor which feeds oil computer. We can diagnose and repair it.

JollyGreen · 11-29-2008, 01:25 PM

I was helping a neighbor with a similar problem a few months ago and as a result of our troubleshooting I am curious how a trim sensor will cause over pumping. I thought it prevented the pump from running if the motor was trimmed up to a certain position. Please explain.

Based on our research I would go with SOS.

cptskinny · 11-29-2008, 02:10 PM

I have had the oil tank float switch changed and that did not help.

sosmarine · 11-29-2008, 02:38 PM

If you changed the engine float switch then it is either wiring or computer. Is your "Return to port switch" part of the compter or seperate? I may have a new computer that I will let go cheap. I would be need the model number of your motor to make sure.

Sequoiha · 11-29-2008, 08:44 PM

If in fact it is a 2000 model,,,, and the oil tank on the engine is filled all the way to the top, then the float switch on the engine tank is bad... this switch is the only one that turns the pump on and off.... this system PBS has been the downfall of very many yamaha technicians... if the pump is running then the circuit is good... give me a call on monday,, ill talk to you about it....:usaflag

11-29-2008, 09:19 AM	#1
cptskinny Junior Member Ruby Red Lip Join Date: Oct 2007 Posts: 28	Major Oil Problem I have a 2000 Yamaha 150hp carborated 2 stroke. It has a small oil tank on the motor, quart or less, and a 2 1/2 Gal main tank, that supplies oil to thesmall tankon the motor. The problem is oil is pumping all the time. Engine smokes and oil is all over the inside of the cowlingand will drain out if the motor is tilted up. Makes a slick on the water. I have had the switch replaced that supposedly shuts the pump on and off to keep the oil between the two lines on the small tank. This did not solve the problem, it still does the same thing. Would appreciate any suggestions for what else could be causing this problem. I had another oil problem a couple months ago, but that turned out to be the plastic turnbuckle on the end of the rod that wentonto the oil pump. Fixed that and had one good trip before this happened. Thanks Cptskinny

11-29-2008, 10:16 AM	#2
xl883lo Senior Member Trigger Join Date: Oct 2007 Posts: 288	RE: Major Oil Problem Go to The Hull Truth and search for "making oil" IIRC this is a common problem for certain models and they had several threads about it.

11-29-2008, 10:48 AM	#3
Bowed Up Senior Member Snapper Join Date: Oct 2007 Posts: 530	RE: Major Oil Problem Check the barrel fuse on the side of the motor near the solinoid.

11-29-2008, 10:55 AM	#4
sosmarine Senior Member Sailfish Join Date: Sep 2007 Location: Navarre/Town Center Posts: 1,826	RE: Major Oil Problem Are you saying the pump in the Aux tank (2.5 gal) is constantly pumping oil to the main tank on the motor? There are a couple of things it could be, float switch in the main tank, short in the wiring, or bad computer. Glad to look at it if you are near Navarre.

11-29-2008, 11:01 AM	#5
metal11 Senior Member Mingo Join Date: Oct 2007 Posts: 122	RE: Major Oil Problem When you say the motor smokes, do you mean more than normal or that it just smokes. If the pump is running all the time it will over flow the tank on the motor and SOS is right about a short or bad float switch. Need to know exactly what it's doing before we can help much.

11-29-2008, 12:51 PM	#6
The Maintenance Shoppe Senior Member Snapper Join Date: Nov 2007 Posts: 531	RE: Major Oil Problem You have a bad oil tank level sender or oil monitor computer, or bad trim sensor which feeds oil computer. We can diagnose and repair it. __________________ *The Maintenance Shoppe* Full service boat, pwc, and trailer repair 4048 Creighton Rd Pensacola, FL. 850-221-6789 www.themaintenanceshoppe.com

11-29-2008, 01:25 PM	#7
JollyGreen Senior Member Mingo Join Date: Jan 2008 Posts: 151	RE: Major Oil Problem I was helping a neighbor with a similar problem a few months ago and as a result of our troubleshooting I am curious how a trim sensor will cause over pumping. I thought it prevented the pump from running if the motor was trimmed up to a certain position. Please explain. Based on our research I would go with SOS.

11-29-2008, 02:10 PM	#8
cptskinny Junior Member Ruby Red Lip Join Date: Oct 2007 Posts: 28	RE: Major Oil Problem I have had the oil tank float switch changed and that did not help.

11-29-2008, 02:38 PM	#9
sosmarine Senior Member Sailfish Join Date: Sep 2007 Location: Navarre/Town Center Posts: 1,826	RE: Major Oil Problem If you changed the engine float switch then it is either wiring or computer. Is your "Return to port switch" part of the compter or seperate? I may have a new computer that I will let go cheap. I would be need the model number of your motor to make sure.

11-29-2008, 08:44 PM	#10
Sequoiha Senior Member Sailfish Join Date: Sep 2007 Location: Pensacola Florida Posts: 2,474	RE: Major Oil Problem If in fact it is a 2000 model,,,, and the oil tank on the engine is filled all the way to the top, then the float switch on the engine tank is bad... this switch is the only one that turns the pump on and off.... this system PBS has been the downfall of very many yamaha technicians... if the pump is running then the circuit is good... give me a call on monday,, ill talk to you about it....: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

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