chiggins25
New member
I’m going to try and provide as much information in this thread as I possibly can, so this may be a long read.
I’ve been having an issue on my 2001 Johnson 115 Ocean Pro Over oiling. I always understood the basic function of the VRO system, but only recently when I began researching have I had a little bit better understanding of how it actually works. I noticed over this winter the few times I had the boat out that it was smoking much more then normal when at idle and lower speeds, the boat also seemed to be sortve flooding itself if I let it idle too long. Underway at speed, the engine ran as it should. The next thing I noticed was that the gallon of oil I added to my VRO tank was consumed much quicker than it normally has in the passed. The engine was also fouling spark plugs very often.
Long story short, I started reading and learned that any sortve air leak in the fuel supply can cause this issue. I started by replacing the seals on the fuel filter that goes into the vro pump, double checking hose connections, etc. no change.
Next I took the pump apart and replaced the fuel diaphragm. I was hoping this would solve my issue as the diaphragm did in fact have a small tear in it. Put the pump back together and reinstalled. No change.
After this, I was a bit stumped so I continued my research. I had read that people in the passed have had issues of excessive oil being forced into the system due to the oil tank cap not venting and the tank becoming pressurized when it gets hot outside. I figured this to be unlikely, but I tested the theory by running the boat with the oil cap completely removed from the tank. No change.
My next guess is that the seal on the check valve that allows oil from the oil chamber to travel to into the fuel pump chamber where it is mixed may be compromised. (My terminology may be a bit off here) this would in turn cause the over oiling symptom I’m experiencing. I also understand that this part on the pump is press fit and not serviceable which would mean I would have to purchase a new pump.
I am all for replacing the pump as opposed to bypassing this system like many others may suggest as I have gathered from my research that the VRO system is actually a pretty good system when working properly, but I just want to make sure there isn’t something I’m missing here.
Is it possible that my air motor diaphragm within the VRO pump could be compromised and causing me this issue? I am being led to believe the answer is no, as if that was the case, the engine would not be receiving enough fuel to run properly when at speed. (I could be mistaken here, but this is just how I understand this system to work)
If anyone has any other suggestions on things to check or look for please let me know. I’d rather not throw good money after bad by repairing my current pump if just simply replacing the entire pump is my solution. I’d rather buy once cry once.
I’ve been having an issue on my 2001 Johnson 115 Ocean Pro Over oiling. I always understood the basic function of the VRO system, but only recently when I began researching have I had a little bit better understanding of how it actually works. I noticed over this winter the few times I had the boat out that it was smoking much more then normal when at idle and lower speeds, the boat also seemed to be sortve flooding itself if I let it idle too long. Underway at speed, the engine ran as it should. The next thing I noticed was that the gallon of oil I added to my VRO tank was consumed much quicker than it normally has in the passed. The engine was also fouling spark plugs very often.
Long story short, I started reading and learned that any sortve air leak in the fuel supply can cause this issue. I started by replacing the seals on the fuel filter that goes into the vro pump, double checking hose connections, etc. no change.
Next I took the pump apart and replaced the fuel diaphragm. I was hoping this would solve my issue as the diaphragm did in fact have a small tear in it. Put the pump back together and reinstalled. No change.
After this, I was a bit stumped so I continued my research. I had read that people in the passed have had issues of excessive oil being forced into the system due to the oil tank cap not venting and the tank becoming pressurized when it gets hot outside. I figured this to be unlikely, but I tested the theory by running the boat with the oil cap completely removed from the tank. No change.
My next guess is that the seal on the check valve that allows oil from the oil chamber to travel to into the fuel pump chamber where it is mixed may be compromised. (My terminology may be a bit off here) this would in turn cause the over oiling symptom I’m experiencing. I also understand that this part on the pump is press fit and not serviceable which would mean I would have to purchase a new pump.
I am all for replacing the pump as opposed to bypassing this system like many others may suggest as I have gathered from my research that the VRO system is actually a pretty good system when working properly, but I just want to make sure there isn’t something I’m missing here.
Is it possible that my air motor diaphragm within the VRO pump could be compromised and causing me this issue? I am being led to believe the answer is no, as if that was the case, the engine would not be receiving enough fuel to run properly when at speed. (I could be mistaken here, but this is just how I understand this system to work)
If anyone has any other suggestions on things to check or look for please let me know. I’d rather not throw good money after bad by repairing my current pump if just simply replacing the entire pump is my solution. I’d rather buy once cry once.