VRO pump failure, bypass

[lmuss53]

I bought a 1992 40 hp Tracker Evinrude VRO motor that the guy said would only run with the enrichner lever in the open position. ..

I cut the line on the oil side of the pump when I took it out and intended to put it back on something with the VRO hooked up.

I put it on a stand and capped the oil line on the pump. I hooked it to a tank of mixed fuel and thought I'd give it a try.

It would not start unless I turned the red tab to the prime position (right angle to the primer body) and then It smoked like crazy.

I decided to just pull the carbs off and clean them since I figured that was the issue. I pulled the pump output line off at the nipple for the carb distribution fitting and got a good strong pulse of fuel from the mixed tank there. When I took it apart the top carb was full of almost straight 2 stroke oil. Not mixed gas which was in the bottom one, but oil, thick and without gas. I seem to remember a failure mode of the VRO pump where the oil pump diaphram fails and floods the motor with oil. Does any one else know about this type of failure on the VRO pump?

The plan now is to clean the carbs and just bypass the VRO, which is pumping a strong stream of mixed gas when I crank the engine with the carbs unhooked. I think I can just cap the oil side and go to mixed gas, correct? One thing I 'm not sure of is what to do with the wires for the alarm, I want to keep the overheat alarm.

One other thing, does anyone know the number for the 3 nipple replacement pump if I decide to get rid of the VRO pump altogether?

Thanks in advance for any help you can give me here.

 

[flyingscott]

Yes the VRO can fail and over oil the engine. Another cause of over oiling is an air leak in the fuel line because of a clamp failure or bad hose. Yes you can just disconnect the oil line and run it on pre-mix

 

[racerone]

Others will argue.------I think the simplest way is to use the 2 hose pump.----A spot to mount it over the pulse hole is already there on the port side of top cylinder.--------Then plug pulse hole for VRO.-------Re-arrange hoses.

 

[Auxlarry]

I agree Racerone!! My VRO went out years ago on my 85 115 hp and that was my first choice. don't mind mixing my oil and I know it's right!!

 

[lmuss53]

Rearranging hoses is the kicker there. The three nipple pump pops right on to the 3 existing hoses and mounts in the VRO spot.

I've done it both ways, the plug that comes out of the pulse hole went right back in the VRO hole, so that was easy enough. I just think the 3 hose pump is easier to install on the 3 hose VRO setup.

I've never pulled a working VRO off of an engine, and I would not. I checked with a pro tech friend today and he said that the VRO is designed to fail like this one did, by over oiling, not under oiling.

But fail this one did, so I will also not pay the extra cost to replace the VRO pump, when mixing is as easy as it is.

3 hose pump from Amazon is on the way, $46.