vro failure rate? "disconnect or not to disconnect"?

homey

Cadet
Joined
Jan 16, 2003
Messages
22
Hello, I periodically check this great site and find it very informative...I currently have twin 1989 Johnson 150's.(one motor rebuilt, new vro pump was installed) These engines are equipped with vro's and I've seen some posts inquiring about disconnecting the vro pump. Is the "vro" pump a disaster? My boat holds 140 gallons of fuel. If I premixed wouldn't my range shrink? Disadvantages or advantages? Any advice or opinions, "to disconnect or not to disconnect" would be appreciated...Thank you, Homey.
 

Yepblaze

Lieutenant Commander
Joined
Jun 1, 2001
Messages
1,686
Re: vro failure rate? "disconnect or not to disconnect"?

VRO for the most part is very reliable.<br /><br /> Just make sure that the oil resivours are kept full of the good quality, and water free oil.
 

Walker

Captain
Joined
Jun 15, 2002
Messages
3,085
Re: vro failure rate? "disconnect or not to disconnect"?

Yes, OMC VRO pumps are very reliable. Right up to the point where they quit and you burn an engine.
 

Capt Ken

Commander
Joined
Jul 30, 2002
Messages
2,270
Re: vro failure rate? "disconnect or not to disconnect"?

Homey, I personally have never seen the oil side of a VRO fail and I've been doing this for 21 years. Now many engine failures are blamed on the VRO because it makes a good scapegoat when bubba the mechanic isn't educated enough to recognize the real cause of the failure. 99% of the failures are due to either lean fuel mixture on one or more cylinders or overheating. Dirty carbs are the biggest killer of 2 cycle engines so why don't we bypass the carbs and pour fuel straight into the engine. The newer VRO pumps are attached to the alarm system and if the pump loses pressure, the alarm sounds. Even if you replace an older pump, the replacement has instructions on how to connect to the alarm system. Every VRO failure I've seen has caused reduced fuel flow like a common fuel pump, not reduced oiling. You will find very few mechanics knowledgeable of the system that will recomend removal.
 

acc

Seaman
Joined
Apr 9, 2003
Messages
59
Re: vro failure rate? "disconnect or not to disconnect"?

I had a VRO go out on a Johnson GT100 bass boat several years ago....fortunately upstream so I drifted to the harbor....(You know, the scenery is pretty nice if you slow below 60 knots to see it)<br /><br />Offshore motor and kicker are premix because I bought them new and insisted on premix....<br /><br />Recently purchased 93 bass boat has VRO and will be neutered soon......<br /><br />The recent posts regarding VRO undo were mine and I thank the reponders for their help....
 

rudeafrican

Petty Officer 1st Class
Joined
Oct 29, 2002
Messages
225
Re: vro failure rate? "disconnect or not to disconnect"?

acc,<br /><br />Just a couple of questions,<br />- did your motor actually seize up?<br />- if so, how many cylinders were damaged?<br />- when the VRO failed did the alarm sound?<br />- What was the symtoms of the failure?<br /><br />The reason I ask is that I notice that Capt. Ken, Joe Reeves and Clanton, all men with decades of experience between them, all vouch for the reliability of the system. I myself have rebuilt my 2 VRO's (as a precaution) and from the design I cannot see how the "oil pump" , and I use oil pump circumspectly, can fail without the "fuelpump" failing as well. The whole system is driven by 1 motor, the air motor, operating the piston for the fuel and oil pump. <br /><br />Of course any interuption of the oil supply such as no oil, airleaks or kinks in the hoses would negate the above. But that goes the same way for any oiling system such as Yamaha's autolube etc.<br /><br />So Homey, to answer your question, personally I do not disconnect. My motors are now 12 years old and running fine. Ensure proper maintainance of the system, such as clean the oil tank, clean pickup, good quality oil, ensure no airleaks, and regular alarm testing will go a long way to hassle free boating. Also every few years rebuild the VRO, the 2 kits required cost less than $40.<br /><br />With a built in tank with 140 galls you will eventually not know what oil/fuel ratio you have.<br /><br />Just my 0.2 cents worth.
 

acc

Seaman
Joined
Apr 9, 2003
Messages
59
Re: vro failure rate? "disconnect or not to disconnect"?

Hey rude.....<br /><br />The VRO went out about 20 miles upstream from Ditto Landing in Huntsville AL<br /><br />It manifested itself by sounding the beeps that indicate VRO failure....not overheating....not low oil level in the oil tank....<br /><br />Engine did not seize.....no cylinders burned...<br /><br />I returned to dock using my electric trolling motor......<br /><br />Dealer replaced the VRO.....<br /><br />But that experience is the reason why I will do the bypass surgery.......<br /><br />'hope this answers your questions....
 

Capt Ken

Commander
Joined
Jul 30, 2002
Messages
2,270
Re: vro failure rate? "disconnect or not to disconnect"?

So what you are saying ACC is that everything worked like it was suppose to and no damage resulted. Premixing fuel usually leads to over oiling of the engine studies have found. Most boaters when adding oil to their fuel usually add more than is needed. Or they think the boat will take more fuel than it actually does and will have added oil for the guessed amount. 50:1 is the ratio for high speed running. At idle, 100:1 is the correct ratio. Varable Ratio Oiling takes this in consideration and thus reduces the fouling at low speeds.
 

rickdb1boat

Supreme Mariner
Joined
Jan 23, 2002
Messages
11,195
Re: vro failure rate? "disconnect or not to disconnect"?

As rudeafrican said, maintenence is the key for VRO related problems. If you take care of the items he mentions, the odds are with you. But it is a personal thing. Either you trust it or you don't. If you're going to wonder every time you go out if it's going to fail(For one reason or another), then it's best to pre-mix and forget it. I have to say that I have always pre-mixed in the past and will continue to do so. But that's just me.
 

acc

Seaman
Joined
Apr 9, 2003
Messages
59
Re: vro failure rate? "disconnect or not to disconnect"?

A Suggestion:<br /><br />Why don't those people that want VRO keep it???<br /><br />Why don't those who don't want VRO remove it???<br /><br />This is not supposed to be some sort of religious argument.....<br /><br />Me, I'm going fishing at first light in the AM...Then I'm going again on Thursday.....But the first day it rains, I'm gonna do surgery on that VRO....<br /><br />More seriously, thanks to those who helped me....<br /><br />curtis
 

Dunk50

Seaman Apprentice
Joined
Nov 14, 2002
Messages
34
Re: vro failure rate? "disconnect or not to disconnect"?

acc I am one day ahead of you. I did not want the VRO and last night this Forum helped me take it off. This morning I went to Michigan City Indiana (Lake Michigan) and caught five Coho and one 12#8oz King. It was nice after a long winter. Thanks to you on the Forum
 

homey

Cadet
Joined
Jan 16, 2003
Messages
22
Re: vro failure rate? "disconnect or not to disconnect"?

Thank you all for the replies and advice...This is a hot topic and you all have valid points...I've decided to keep my vro's for a couple of reasons. My motors are almost 14 years old and in good shape. As I said before, the starboard motor has been rebuilt with new vro. My mechanic checked out the port motor also in good shape. Both motors are burning the same amount of oil and the break in of the starboard motor is going well. (They get serviced regularly)...The thought of premixing with many gallons of fuel...well, I dont want to think about it...Thanks again, Homey
 

LITTLE LEAK

Recruit
Joined
Apr 13, 2012
Messages
1
Re: vro failure rate? "disconnect or not to disconnect"?

as rudeafrican said, maintenence is the key for vro related problems. If you take care of the items he mentions, the odds are with you. But it is a personal thing. Either you trust it or you don't. If you're going to wonder every time you go out if it's going to fail(for one reason or another), then it's best to pre-mix and forget it. I have to say that i have always pre-mixed in the past and will continue to do so. But that's just me.

:)be safe no gessing about is it working pre mix it
 

WinnipegBoatMan

Petty Officer 3rd Class
Joined
Nov 5, 2009
Messages
91
Re: vro failure rate? "disconnect or not to disconnect"?

I've recently found myself working on my friends 93' 90Hp Evinrude with the VRO system still installed.. I agree with Capt Ken.. With propour knowledge of the VRO system, and frequent inspection of the Carbs, and fuel lines, the system is honestly great! Especially when your filling your boat with 20 Gallons of fuel for the day, not having to worry about adding the correct amount of oil having to be added! If your using small 5 gallon fuel tanks, sure its easy to mix.. but inboard tanks.. VRO all the way!
 

rockyrude

Lieutenant Junior Grade
Joined
Sep 10, 2007
Messages
1,120
Re: vro failure rate? "disconnect or not to disconnect"?

I'm sure these guys figured it out in the nine years since the last post.
 

WinnipegBoatMan

Petty Officer 3rd Class
Joined
Nov 5, 2009
Messages
91
Re: vro failure rate? "disconnect or not to disconnect"?

BAHAHAHA! Guess i should take it ease on the beers while on here!
 
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