VRO pump ?

[GSL1]

I have a 2000 70hr Johnson after the boat sits for a week or so the carbs fill with oil and engine wont start until I drain oil out of carbs engine starts run great. As long as I use the boat every day or so I have no probelms only after she sits for awhile. No alarms go off a little smoke when first fired then runs great also not burning much oil I fill resevior twice a season maybe 3 times. Is there a way to test the VRO pump.

 

[wilde1j]

Re: VRO pump ?

The OMS (you don't have VRO) is leaking oil after shutdown and probably needs to be replaced. Shop manual may have tests for the pump (I don't have a manual for your motor).

 

[tashasdaddy]

Re: VRO pump ?

is oil tank higher than motor? it siphons down when not running. i had the same problem with my pontoon. converted OMS to premix. easily done.

VRO conversion w/ pump still working

if the fuel side on your Pump is still working it is very simple. unplug the 2 line harness going to the oil tank, unplug the 3 or 4 wire harness, going to the Vro pump. cut and cap the oil line going into the motor. add oil to fuel tank, mix well, then remove fuel line at top carb, catching gas in a container, pump the fuel line bulb until you get premixed gas to the carb. you can tell as it will change color. put line back on carb, and go boating.

 

[GSL1]

Re: VRO pump ?

thanks for the advice,instead of disconnecting oil line and premixing can I just put a inline quick connect on the oil line like the one for the gas line and disconnect after use and reconnect before the next use and reprime .

 

[GSL1]

Re: VRO pump ?

wild1j
marina where I bought boat told me about VRO pump nothing about a OMS what is it and what does it do

 

[dajohnson53]

Re: VRO pump ?

wild1j
marina where I bought boat told me about VRO pump nothing about a OMS what is it and what does it do

VRO "variable rate oiling" was the name of the pump through the mid-90s sometime (someone will be able to clarify this). There are two versions with possibly some updates between them (VRO and VRO2). EVERYONE (users, parts guys, service techs) tends to still use the VRO term even pumps made after they changed to ....

OMS "oil metering system" is what they changed the name for on pumps that are the most current version and were standard on all automatic oiling engines after that mid-90s date (sorry I can't be more exact, but I don't know w/o looking it up).

The difference is that OMS have a constant (nearly constant?) oiling rate rather than variable. They of course are updated based on materials, alarms, etc. but the oiling rate is the primary difference.

A normal user would no idea what kind of pump they have - it mixes oil either way. It is in the same place on the engine, has the same connections, same alarms, pretty much looks exactly the same except for very subtle differences.

Look at this website, it's very interesting: http://continuouswave.com/whaler/reference/VRO.html

I wouldn't worry about it, it is a common thing to call them all VRO. In my experience, the local BRP/Johnson/Evinrude parts guys and service techs all still call them VRO regardless of whether they're VRO, VRO2 or OMS. And it really doesn't matter because asking for a VRO pump when you really need an OMS pump will still get you the pump intended for your engine and it will be an OMS pump, unless it comes from stock that is over 10 years old!

It doesn't matter if you ask for parts for a VRO or OMS pump, because they won't base the parts on what you call the pump, but what it's model/part number is.

 

[GSL1]

Re: VRO pump ?

instead of cut the line and capping could I put a quick connect inline and disconnect the oil line and reconnect and prime it before use

 

[d.boat]

Re: VRO pump ?

tashasdaddy above mentioned a problem like what you're describing if the oil tank is above the fuel pump. Is this the case with yours? If so, maybe installing it lower would do the trick.

I'm not expert, but i can't think of any physical reason the oil would be getting into the carb bowls at rest except through gravity. The oil system is not pressureized, it's a "suck" system up to the fuel pump, not "push".

As for a quick connect, I don't see why any quick connect wouldn't work (wouldn't have to be like the fuel)) as long as it's totally air tight when you connect it.... and as long as you fully purge the line of air and reprime every time you disconnect/reconnect it. The system relies on air-free oil lines and full prime.

like i said, maybe moving tank will be better solution?

 

[wilde1j]

Re: VRO pump ?

Quick disconnect is a bad idea, since you would have to verify the oiling was working every time out ... way too much trouble. Unless oil tank is higher than the motor, something is clearly wrong. My neighbor had a similar issue several years ago, his tank was well below the motor, and replacing the OMS pump solved the problem. The only other fix, as you already know is to drain the carb float bowls every time out ... clearly a pain in the *****.

 

[GSL1]

Re: VRO pump ?

dboat and wilde1j
thanks for the advice and yes the oil tank is above the engine I am thinking of installing a inline petcock to close the flow of oil to the fuel pump when not in use this way I should not have to worry about air getting into the line should only have to purge the line before making last connection to fuel pump again thanks for all the help .