Johnson 70VRO with no VRO pump

sssports

Seaman Apprentice
Joined
Dec 11, 2006
Messages
35
Hello everyone! This is my first post/question, I have been reading a lot, and well I have to laugh because this is my first boat so I feel quite dumb, and after reading a lot of posts feel even dumber.

So here we go. I purchased a couple of years ago a project boat an old river john 16' with a Johnson 70 VRO engine. OMC controls in a right hand console.

I fixed up the inside of the boat with casting decks, new console etc. The 70 seemed to run fine in a barrel of water, and I ran it dry each fall, fogged it etc for winter storage. Well yesterday I towed it to the water for it's maiden run.

As in the barrel it started and idled fine, got out of the harbor and increased the throttle and it just dogged for about 5 seconds and then died. Now it starts very hard if at all, and will no longer even idle. All the boat dealers are backlogged for a month or more so I thought I would try and determine what is wrong with it myself. Problem is the more I read the more confused I get.

There is no VRO tank and there is a inlet below the fuel connector that has been plugged with a piece of fuel line with a bolt inserted to plug it, and with a worm clamp to hold/seal the bolt.

I was reading the FAC on the reliability of the VRO system and the fact that it gets blamed for many problems that in fact have nothing to do with the VRO system, in that FAC it talked about both a fuel pump and a oil pump being a part of the VRO system? Before I totally confuse everyone here maybe I should ask some basic questions which are as follows.

1) Does the Johnson 70 VRO engine have it's own fuel pump on the engine itself?
2) Can you simply plug this bottom connection below the fuel line connector and run a 50:1 fuel mix without doing anything else?
3) If the fuel pump was part of the VRO system, would this engine even idle without it?


I would also like to add a little information that may help to eliminate questions from anyone trying to assist me. The fuel tank is a brand new 24 gal moller, the fuel line is brand new and also moller. New fuel filter. I don't believe I have any fuel line air leaks, but I am not 100% certain, as I just read the FAC on testing for leaks, both at the engine and from tank to engine this morning. I did not replace any of the fuel lines inside the cowling, but after reading bringing a engine to life, seems I stopped short of doing everything necessary on an engine only idled and run in a barrel each summer for the past three years. I did fog cylinders, and carbs each fall with seafoam, and before taking it out ran the engine and fogged seafoam directly into the carbs for about 5 minuts. I also added the prescribed amount of seafoam into the fuel tank. After reading a lot of the FAC's on here is it more than likely that I should remove and rebuild the carbs, replace all fuel lines in the cowling etc?

Thanks for any and all help anyone is willing to offer. I am just a lot overwhelmed with what to do first, and am not even certain at this point that I have a fuel pump because of the VRO FAC.
 

Boss Hawg

Lieutenant
Joined
Apr 9, 2009
Messages
1,433
Re: Johnson 70VRO with no VRO pump

I have a '87 70VRO that is bypassed & much prefer it that way ;)

As far as your problems running best advice i can give (without a lot of one finger typing) is to read the TOP SECRET & STICKYS at top of this page:cool:
 

kenmyfam

Supreme Mariner
Joined
Aug 10, 2006
Messages
14,392
Re: Johnson 70VRO with no VRO pump

Rebuild carb's. Will only do good.
Sounds like you are using the fuel side only of your pump. As long as you premix your fuel there should be no problem, that is as long as the fuel side is O.K. It is re-buildable on the fuel side if necessary.
 

sssports

Seaman Apprentice
Joined
Dec 11, 2006
Messages
35
Re: Johnson 70VRO with no VRO pump

Hey guys thanks!

But since I am a complete "newbie" I am still not sure about the questions I asked.

Does the fuel pump on the 88 Johnson 70 VRO engine reside ON the engine itself? Or was it part of the VRO setup?
And is the setup I have, no VRO tank, just a fuel tank/fuel line plugged in to the fuel fitting on the 70 VRO a working setup?

Another problem I am having is there seems to be no manual available for the 88, and no fuel pump, or fuel pump rebuild kit, at least not on this site.

Thanks for any assistence!
 

kenmyfam

Supreme Mariner
Joined
Aug 10, 2006
Messages
14,392
Re: Johnson 70VRO with no VRO pump

Fuel pump should be on the port side of the motor.
Should be able to get a manual for it. Go with an OEM manual. Much better than the Seloc or Clymer.
Make sure you premix the fuel.
 

sssports

Seaman Apprentice
Joined
Dec 11, 2006
Messages
35
88 Johnson 70 VRO

88 Johnson 70 VRO

I will try to just ask direct questions and hopefully receive a complete answer, as it is just about where to get a manual, and a carb question.

I have been reading alot and trying not to ask questions not already answered eleswhere, but have not found my specific questions.

Where can I get a OEM repair manual for the 88 70hp VRO engine? I boats does not list having one.

Are the three carbs on this engine fixed jets?

In the spirit of trying to help as well as ask for help, I found a link for a repair kit for the VRO pump. Here it is.

http://www.maxrules.com/fixomcvro.html

It also has instructions for dissassembly, and reassembly. Hopefully since I boats does not sell any rebuild kits or replacement pumps I am not breaking any rules posting this link.

Thanks
 

tashasdaddy

Honorary Moderator Emeritus
Joined
Nov 11, 2005
Messages
51,019
Re: 88 Johnson 70 VRO

Re: 88 Johnson 70 VRO

manuals http://www.outboardbooks.com/

you have fixed jet carbs. the 1988 has a VRO2 pump, which is known to possibly cause problems, and is 21 years old. i would personally either eliminate the oil side or use the straight premix fuel pump.

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.

Vro Replacement Fuel Pump Kit "no Oil"
(for Using Oil/gas Pre-mix In Fuel Tank)

#5007422 it is in the $300 range.


$100 range
Part Number: 0385784
Description: FUEL PUMP AY
Pack Qty: 1
Dimensions: 3.50 x 3.50 x 2.25 (in)
Weight: 0.44 lbs
Equivalent Parts: 0395712,0398385,0433390,0438559

ok you have been given several options.
 

sssports

Seaman Apprentice
Joined
Dec 11, 2006
Messages
35
Re: Johnson 70VRO with no VRO pump

Hey Tashasdaddy,

THANKS! Now I can get the exact oem manual for my engine, much appreciated!

I have also since determined that my engine has the VRO2 pump as there is a tag on the pump. so some of my questions are answered.

Have also found a rebuild kit for it, but do not as yet know if it is bad or not, will have to do some testing in a water barrel. with guage hooked up. IF I can get it to start and run again.

Slowly getting there lol.
 

sssports

Seaman Apprentice
Joined
Dec 11, 2006
Messages
35
Re: Johnson 70VRO with no VRO pump

Tashasdaddy,

I guess I have confused some, as I didn't know anything about any of this being my first boat, hopefully this will help.

My motor already had the VRO oil tank completely disconnected and gone, I just didn't know if the motor would run the way it was set up. The conversion was done just as described here, so I am guessing that is not the problem.

Hopefully the fuel side of the VRO pump is ok, and it is the carbs gummed up. I will take off the carbs, get rebuild kits, and clean and install all kit parts. I will also replace all the fuel lines inside the cowling.

I am learning, but there is a lot to learn about these engines.

Thanks for all your help!
 
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