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Author Topic:   Johnson 150 Fuel Leak

george nagy posted 07-02-2013 05:51 PM ET (US)
I recently relaunched the boat after a 5 year or longer drydock. On the initial trip out last week I had a few ocassions were the no oil light and buzzer came on. The motor is a 1998 johnson 150 oceanrunner. The motor was serviced just prior to relaunch which consisted of amongst a few other things a carb rebuild and overhaul and water pump. The motore was sea trialed with success by the mechanic. The motor does run great. When the oil warning alarm came on I checked the primer bulbs on both the oil reservoir and the fuel line and although oil primer is hard the fuel would not remain hard and when pumped and at idle there was a rainbow slick in the water near the motor. This oil warning only occurred a few times at a slow idle speed rpm.
today I took apart the oil tank and checked all the hose connections and checked the oil line for air, there didn't seem to be any. When I checked prime on the fuel bulb I was surprised to see fuel flowing from the bottom of the pump assembly which seemed to be melting from the gas. I checked the hose connection and replaced with a hose clamp and it still leaks. It leaks a lot. There was signs of green fuel in the throats of each carb which would suggest that they are receiving oil. My suspicion is that at a certain rpm the engine does not receive the right fuel oil mixture which may have caused the warning sound. It may also be possible that at higher rpm speeds the engine is burning enough fuel to reduce the fuel from leaking out.
does anyone have any advice on how or what to repair or replace? I will tackle this myself.

jimh posted 07-02-2013 08:41 PM ET (US)
I don't recall if an c.1998 OMC will have the VRO or the OMS fuel pump. Both pumps monitor the oil flow and can sound an alarm if the oil pump side of the pump is not working properly.
Your observation of an oil slick tends to fit with the usual failure mode of the pump that produces too much oil in the fuel.
Check SHOP.EVINRUDE.COM to see what repair parts are available for the fuel pump. Some later models can be serviced.
george nagy posted 07-02-2013 09:13 PM ET (US)
The oil slick is from the gas leaking from the bottom of the pump. It is very apparent when the air cleaner is off that this is a gas slick caused by the leak. The engine does not have a tremendous amount of blue smoke which would tend to signify an over oiling condition but when it is started and cold it does still have blue smoke coming from the exhaust. I will look at the link provided to get some more intel. Thanks
george nagy posted 07-02-2013 10:17 PM ET (US)
In further review of an exploded parts diagram I believe that the problem is occurring between the fuel and oil side of the pump. I think the gasket material between the two have eroded away, perhaps by ethanol or most likely having been dried out for 5 years without any fuel in the system. I think this will be my starting point for remedying this problem.
george nagy posted 07-03-2013 12:18 PM ET (US)
Well, I bit the bullet and decided to replace the entire vro pump. My thoughts are that this motor is tight and clean and runs great so I might as well invest in a new pump in order to keep it that way. Seemingly small investment in the larger picture I guess. It looks as if the swap will be very simple too!
pcrussell50 posted 07-03-2013 06:42 PM ET (US)
IIRC from the seminal article on VRO in the reference section of CWW, yours should be an OMS, (the latest and final iteration of VRO). Also from the article, somewhere they talk about how replacement pumps are rebuildable, which would be a tremendous savings off the $400-500 it costs for a new pump.
Ask your marine mechanic if your pump is the rebuildable kind.
-Peter
george nagy posted 07-03-2013 10:08 PM ET (US)
I went for the new pump because there is a fuel leak on the oils side, there is acrack or void somewhere there but I can't' isolate it. I had it apart and did not see any obvious problems with the rubber inside. I will keep the pump around for future investigation later. My thoughts are that if the pump is replaced entirely this would greatly help to increase the longevity of the entire motor itself. As for local marine dealer there really aren't many here as most are yamaha powered brands. In fact this old mako and eventually just grady dealer was one of the oldest omc dealers around and according to the owner they are no longer selling evinrude and are depleting their stock of parts and then no more just yamaha.
george nagy posted 07-03-2013 10:09 PM ET (US)
it is oms by the way.

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Author	Topic: Johnson 150 Fuel Leak
george nagy	posted 07-02-2013 05:51 PM ET (US) I recently relaunched the boat after a 5 year or longer drydock. On the initial trip out last week I had a few ocassions were the no oil light and buzzer came on. The motor is a 1998 johnson 150 oceanrunner. The motor was serviced just prior to relaunch which consisted of amongst a few other things a carb rebuild and overhaul and water pump. The motore was sea trialed with success by the mechanic. The motor does run great. When the oil warning alarm came on I checked the primer bulbs on both the oil reservoir and the fuel line and although oil primer is hard the fuel would not remain hard and when pumped and at idle there was a rainbow slick in the water near the motor. This oil warning only occurred a few times at a slow idle speed rpm. today I took apart the oil tank and checked all the hose connections and checked the oil line for air, there didn't seem to be any. When I checked prime on the fuel bulb I was surprised to see fuel flowing from the bottom of the pump assembly which seemed to be melting from the gas. I checked the hose connection and replaced with a hose clamp and it still leaks. It leaks a lot. There was signs of green fuel in the throats of each carb which would suggest that they are receiving oil. My suspicion is that at a certain rpm the engine does not receive the right fuel oil mixture which may have caused the warning sound. It may also be possible that at higher rpm speeds the engine is burning enough fuel to reduce the fuel from leaking out. does anyone have any advice on how or what to repair or replace? I will tackle this myself.
jimh	posted 07-02-2013 08:41 PM ET (US) I don't recall if an c.1998 OMC will have the VRO or the OMS fuel pump. Both pumps monitor the oil flow and can sound an alarm if the oil pump side of the pump is not working properly. Your observation of an oil slick tends to fit with the usual failure mode of the pump that produces too much oil in the fuel. Check SHOP.EVINRUDE.COM to see what repair parts are available for the fuel pump. Some later models can be serviced.
george nagy	posted 07-02-2013 09:13 PM ET (US) The oil slick is from the gas leaking from the bottom of the pump. It is very apparent when the air cleaner is off that this is a gas slick caused by the leak. The engine does not have a tremendous amount of blue smoke which would tend to signify an over oiling condition but when it is started and cold it does still have blue smoke coming from the exhaust. I will look at the link provided to get some more intel. Thanks
george nagy	posted 07-02-2013 10:17 PM ET (US) In further review of an exploded parts diagram I believe that the problem is occurring between the fuel and oil side of the pump. I think the gasket material between the two have eroded away, perhaps by ethanol or most likely having been dried out for 5 years without any fuel in the system. I think this will be my starting point for remedying this problem.
george nagy	posted 07-03-2013 12:18 PM ET (US) Well, I bit the bullet and decided to replace the entire vro pump. My thoughts are that this motor is tight and clean and runs great so I might as well invest in a new pump in order to keep it that way. Seemingly small investment in the larger picture I guess. It looks as if the swap will be very simple too!
pcrussell50	posted 07-03-2013 06:42 PM ET (US) IIRC from the seminal article on VRO in the reference section of CWW, yours should be an OMS, (the latest and final iteration of VRO). Also from the article, somewhere they talk about how replacement pumps are rebuildable, which would be a tremendous savings off the $400-500 it costs for a new pump. Ask your marine mechanic if your pump is the rebuildable kind. -Peter
george nagy	posted 07-03-2013 10:08 PM ET (US) I went for the new pump because there is a fuel leak on the oils side, there is acrack or void somewhere there but I can't' isolate it. I had it apart and did not see any obvious problems with the rubber inside. I will keep the pump around for future investigation later. My thoughts are that if the pump is replaced entirely this would greatly help to increase the longevity of the entire motor itself. As for local marine dealer there really aren't many here as most are yamaha powered brands. In fact this old mako and eventually just grady dealer was one of the oldest omc dealers around and according to the owner they are no longer selling evinrude and are depleting their stock of parts and then no more just yamaha.
george nagy	posted 07-03-2013 10:09 PM ET (US) it is oms by the way.