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Author Topic:   VRO pump leaking
Hank posted 08-19-2002 01:12 PM ET (US)   Profile for Hank   Send Email to Hank  
The VRO pump on my '84 V-4 Evinrude leaks when I pump the primer bulb. The leak is at the joint between the two clamshell sections of the oil mixer portion of the unit. I pre-mix so I'm not interested in the proper functioning of the mixer. The leak is very severe, however it seems to be a gasket at the joint between the two sections.

A new VRO pump costs $240. Has anyone heard of a rebuild kit for these units ?


Cpt Quint posted 08-19-2002 01:44 PM ET (US)     Profile for Cpt Quint  Send Email to Cpt Quint     
If you premix and no longer use the oil side of the pump than you can replace this with a standard OMC pump. Only modification is to clamp off 3 hoses, but this is a common repair and stndrd pump is aboutn $40. Therte is not an after market VRO that Im aware of.
Hank posted 08-19-2002 06:34 PM ET (US)     Profile for Hank  Send Email to Hank     
Cap't Quint
Thanks for the reply. It is my understanding that the standard fuel pump was mounted directly on the crankcase from which it received crankcase pulses to run the pump.

My current VRO pump is connected to the crankcase by means of a hose assembly attached to a nipple on the crankcase.

Where, on my engine, would the standard pump mount ? Is there some plate covering an attachment flange ? Or, is there a version of the standard pump which could obtain crankcase pulses through a hose as does the VRO unit ?
Certainly, spending $40 beats spending $240.


mcahill2 posted 08-19-2002 07:08 PM ET (US)     Profile for mcahill2  Send Email to mcahill2     
and you will always no that you have oil. VRO
VERY RARELY OILED I disconected it on my brand new 2000 115, have seen to many fail


WSTEFFENS posted 08-20-2002 11:17 AM ET (US)     Profile for WSTEFFENS  Send Email to WSTEFFENS     
I had engines of that vintage in the same time span that they were built. I caught a heavy dose of alchol from a fuel dock and it did both of my pumps dirt. Same thing leak in the main chaimber. The repalcements were more tolerant and never failed. The cost of the replacement isn't the national debt, bite the bullit and get it fixed right! I have had several pairs of VRO engines and no problems. Maintence is the key. VRO will not stand for leaky, loose or cracked hoses, as it depends on crank case pulse pressure to work and pump. Otherwise it is a dirt simple mechanical process with no computer spooks & goblins. By passing the system is just a band-aid.


Hank posted 08-20-2002 08:26 PM ET (US)     Profile for Hank  Send Email to Hank     
Cap't Quint
I checked with my local Johnson/Evinrude dealer and you're right on. I can outfit the engine with the standard pump for about $40 plus $10 for new hoses, clamps etc.

I have no prejudice aginst the VRO system. I understand that the system gets an undeserved bad rap. Anytime a cylinder cooks
for any reason the VRO system gets blamed.

In my case it's the money ! I've been premixing for years with this engine. If I wish to use automatic oiling I shall have to replace the VRO pump at $240 and also provide an oil supply tank (which did not come with the boat)as well as hook up appropriate alarms, oiling filters, etc. I imagine this additional hardware does not come cheap. With the standard pump, for $50 I can be ready to go fishing.


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