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  1. #1
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    Bypassing the VRO

    I've got a 1985 Evinrude 140HP looper, and I have heard that the VRO system uses a common shaft for the fuel and oil pumps. The plugging off of the oil lines and input would starve the shaft of lubrication, and over time, the pump would then fail. That said, the recommendation was to go to a fuel pump that is ONLY for fuel, as from a pre-mix/non-VRO motor.

    Is this a valid concern, because I hear a lot of guys just plug off the oil-lines and run pre-mix?

    thanks

  2. #2
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    No shaft. It works from an air pulse to a diaphragm in the pump via a hose from the crankcase to the pump. Plug the oil line, premix, and you're good to go.
    Last edited by frederick55; 01-10-2013 at 08:48 PM.

  3. #3
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    Click image for larger version. 

Name:	vro cutaway.jpg 
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ID:	270752
    Quote Originally Posted by frederick55 View Post
    No shaft. It works from an air pulse to a diaphragm in the pump via a hose from the crankcase to the pump. Plug the oil line, premix, and you're good to go.
    It doesn't have the setup like the picture, internally????

  4. #4
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    Evinrude makes a fuel only pump for v-4 and smaller loopers/crossflows. There are a bunch on ebay. Would be a simple hassle free pump to get rid of the VRO.
    Although, I ran a VRO fuel pump with the oil side disconnected for years without an issue. Whatever suits you best.

  5. #5
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    Quote Originally Posted by lokinutz View Post
    Evinrude makes a fuel only pump for v-4 and smaller loopers/crossflows. There are a bunch on ebay. Would be a simple hassle free pump to get rid of the VRO.
    Although, I ran a VRO fuel pump with the oil side disconnected for years without an issue. Whatever suits you best.

    Yeah; I did the removal and install of a straight pulse pump on my 90HP Evinrude, which had the port and bolt bosses on the block. I'll have to look at this looper (the 140HP) and see if it has the same port available to do that. I will run it with the VRO minus the oil input and see how it goes.

    thanks

  6. #6
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    Just one thing after disconnecting the VRO and adding oil to the fuel, disconnect the fuel hose from the VRO and pump fuel to thru the hose untill you get premixed fuel to the pump so you dont run a fuel hose full of un-oiled fuel thru your motor.

  7. #7
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    or do the smart thing and leave the vro on to do what it is built to do. less oil at low rpms so you have a much cleaner and smoother running motor. when rpms increase so does oil ratio. omc is not like older mercs with a plastic gear driven pump that fails. if your pump on omc is getting a pulse signal you have gas and oil as long as you keep oil in the tank there is not a problem.

  8. #8
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    If you plug the oil hose and disconect the electrical plug on the vro pump it work just fine. I have done this on a 100 something engines, it is also possible to rebuild it and ot will work for 10 years
    When it comes to propellers, I hate Choppers!

    -Sunwind 480 race boat 90 omc- Sold
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    -B-28 Batboat 662 merc sci- Present
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    -Twister 24 Merc 200XS ROS - Present

  9. #9
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    Quote Originally Posted by powrguy View Post
    Click image for larger version. 

Name:	vro cutaway.jpg 
Views:	56 
Size:	96.0 KB 
ID:	270752

    It doesn't have the setup like the picture, internally????
    If you look at the bottom of your diagram it shows the fitting to the pulse. That is what drives the pump. There is no mechanical connection.

  10. #10
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    Hey fellas I never thought and dont think I have seen it asked or answered.....when replacing the VRO with a straight fuel pump....my crossflow had a 3 line VRO on it but does have the fuel pump bosses on it. Is it better to change out to the 3 line fuel pump or can you just switch it out for the 2 line pump and not have to switch any pulse hoses around.
    Laser 1550 ...under construction with a serious weight loss
    Motor 2.4....undecided on hp yet

  11. #11
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    Quote Originally Posted by 1FASTLASER View Post
    Hey fellas I never thought and dont think I have seen it asked or answered.....when replacing the VRO with a straight fuel pump....my crossflow had a 3 line VRO on it but does have the fuel pump bosses on it. Is it better to change out to the 3 line fuel pump or can you just switch it out for the 2 line pump and not have to switch any pulse hoses around.
    I would go with the 2 line pump that bolts to the block and plug the pulse line that went to the VRO. Many times that pulse hose becomes loose and causes low fuel-oil pressure

  12. #12
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    You could go with a Carter electric pump with great results. Don't have to worry about stock pump problems. Cheaper too!

  13. #13
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    Quote Originally Posted by perfmarine1 View Post
    I would go with the 2 line pump that bolts to the block and plug the pulse line that went to the VRO. Many times that pulse hose becomes loose and causes low fuel-oil pressure
    Thats kinda what I was thinking .....just didnt know if changing from the factory (dont laugh to hard) if the pulse would be different or pulse hoses would have to be rerouted.
    Laser 1550 ...under construction with a serious weight loss
    Motor 2.4....undecided on hp yet

  14. #14
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    Quote Originally Posted by davemvegas View Post
    or do the smart thing and leave the vro on to do what it is built to do. less oil at low rpms so you have a much cleaner and smoother running motor. when rpms increase so does oil ratio. omc is not like older mercs with a plastic gear driven pump that fails. if your pump on omc is getting a pulse signal you have gas and oil as long as you keep oil in the tank there is not a problem.
    +1.

  15. #15
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    I've run VRO's as long as I've been boating and really haven't had a problem. If it works, I'd keep it as mentioned above.

    Regarding damage to the pump after running without oil, I've taken apart pumps that have run with the oil side dry. Typically the oil side is not in good condition. I would not try to use the oil side of a pump that has been run dry.

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