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  1. #1
    Supreme Mariner kenmyfam's Avatar
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    Default Now a Pre-Mixer. (Photos)

    First day of vacation and my VRO pump starts acting up !!!!
    I have read so much here that I knew my options. Nowhere near a computer and 450 miles from home !!!!
    Local dealer had a replacement pump at $508:00
    Asked for a regular fuel pump and was told it would not fit.
    Told them that i would "make it fit"
    Got a pre-mix pump from a 1982 150HP for $82:00 (OMC part) Aftermarket was available at $56:00 and 2 day delivery. No Brainer decision for us as we would spend almost the difference in gas for the car to go and get it 2 days later !!!
    Made an adaptor bracket at the cottage from an old cookie sheet.
    Couple of nuts and bolts from my toolbox stash. Drill a couple of holes (always take the cordless on vacation with a small handfull of bits)
    Put 2 stroke oil in the internal tank (overdo it slightly to make certain I have enough in)
    Pumped the bulb into a gas can till I saw pre-mix coming through
    Put the unknown mix gas in the truck.
    Remove plugs and put a little oil in there (small amount)
    Fire her up.
    Smoked like crazy for about 20 seconds.
    Running like a charm now although a little smokey on the first tank.
    I also disconnected the oil warning wire and plugged off the oil line.
    Ran great for the balance of the vacation.
    Once home removed the oil tank and lines and tidied up the oil line feed to the motor.
    Just have to remember to pre-mix from here on. Should not be an issue !!!!
    Attached Images Attached Images
    Last edited by kenmyfam; October 3rd, 2009 at 12:17 PM. Reason: Rotated a photo and added one
    Marada 2100 Executive Series, 5 Litre V8 with Mercruiser Alpha 1 outdrive. 2007 K-Z Spree 260 RBH, all = a whole lot of family fun !!!!

  2. #2
    Vice Admiral samo_ott's Avatar
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    Default Re: Now a Pre-Mixer. (Photos)

    Excellent ingenuity.
    Steve.

  3. #3
    Lieutenant Commander
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    Default Re: Now a Pre-Mixer. (Photos)

    Quote Originally Posted by kenmyfam View Post
    First day of vacation and my VRO pump starts acting up !!!!

    What were you seeing when it started failing? Thanks. Great save on the vacation!

  4. #4
    Honorary Moderator Emeritus tashasdaddy's Avatar
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    Default Re: Now a Pre-Mixer. (Photos)

    what did you do for a pulse line? nice install.
    FLORIDA GATORS
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    Please, NO PM's (Private Messages) regarding boat/engine problems. they will not be answered.
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  5. #5
    Petty Officer 2nd Class ftltony's Avatar
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    Default Re: Now a Pre-Mixer. (Photos)

    You're the kind of person we all need to have with us if we are stranded on a deserted island! Just like the Professor on Gilligans Island, you could probably figure out how to make phones out of coconuts!!!

    As to your dilema, everytime I go on vacation, I have one large box of tools, and another large box of pieces of aluminum sheet, rods and tube, steel goodies, TIE WRAPS, nuts, bolts, screws and basically, everything I hope I DON'T ever need to use, but happy as a clam that I have it when something happens!
    Hold My Beer And Watch This!

  6. #6
    Petty Officer 2nd Class Philthyphil's Avatar
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    Default Re: Now a Pre-Mixer. (Photos)

    I did a bigger reply to this in the Doral section.....we both have Dorals and this happend on the lake where I have a cottage. Like I posted there I'm stashing a liter of 100 to 1 syn oil to dump in the tank in case of VRO trouble when out on the lake. I am also starting to think about buying a pump that would replace mine if it failed and just keep it and a homemade bracket in stock. The whole thing is less than 100 bucks and it sure could save a long weekend. I'd like to check it out up close the next time your at Ahmic if I can.....cheers......Phil

  7. #7
    Supreme Mariner
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    Default Re: Now a Pre-Mixer. (Photos)

    Some of the commercial V4 loopers came out with that same set up but they used 2 of the standard pumps. One is borderline on supplying enough fuel volume / pressure. Just be real careful.

  8. #8
    Petty Officer 1st Class
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    Default Re: Now a Pre-Mixer. (Photos)

    I am also curious about the pulse line. I am going to have to do mine soon.

  9. #9
    Petty Officer 2nd Class Philthyphil's Avatar
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    Default Re: Now a Pre-Mixer. (Photos)

    Mine is only a 90 hp so maybe volume not as much a problem.?

  10. #10
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    Default Re: Now a Pre-Mixer. (Photos)

    The 90 crossflows won't be a problem. That fuel pump was stock equipment for many years. If your 90 is the 60* looper, I'd be very cautious. The oil injection pump has a lot more capacity. Personally, I'd never go without oil injection.

  11. #11
    Petty Officer 2nd Class Philthyphil's Avatar
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    Default Re: Now a Pre-Mixer. (Photos)

    Mine is an 86 90 hp. As for oil injection I much prefer it. Over the years have had lots of bikes and snowmobiles with oil injection and never have had an issue. Mind you both the bikes and sleds have used much simplier systems that were reliable and easy to service, not like this OMC conglomeration of lines pumps wires etc. My old 1980 Yamaha 340 sled had oil injection and the three sleds we have now use oil injection. My Ski-doo is 600ccs and makes 125 hp and the system is buletproof and simple. And the Ipone syn oil I use is almost smokeless and smells like strawberries.....lol

  12. #12
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    Default Re: Now a Pre-Mixer. (Photos)

    The OMC / BRP system for motors like yours is the simplest on the market. There are no hoses running all over like on a Yamaha or Merc. You have 2 lines in - one for gas, one for oil. Both go to the pump and come out the single outlet which feeds the carbs. Very neat system.

  13. #13
    Petty Officer 2nd Class Philthyphil's Avatar
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    Default Re: Now a Pre-Mixer. (Photos)

    I have a "pulse" line as well, along with I think three wires. Like I said look at a bike or sled. Mechanically driven pump.....like your car..... a handfull of moving parts . One line in one out, fits in the palm of your hand. Like your cars oil pump works the life of the unit. .I had Japanese bikes in the 70's with oil injection and it worked well. With the moderen oils works even better. I would like to keep the system if it fails but that price for a pump is a little over the top. Have to see how it holds out.

  14. #14
    Chief Petty Officer
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    Default Re: Now a Pre-Mixer. (Photos)

    have never heard of these fuel volume problems in any of the other conversion posts i have read?

    -nate

    not saying you dont know what your talking about just dont remember reading about it.

  15. #15
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    Default Re: Now a Pre-Mixer. (Photos)

    Usually when someone wants to replace a non-injection pump they use the one that looks like an injection pump without the oil side. Those pumps, both injected and non-injected, have more than enough capacity for a V4 or V6 looper.

    On the V4 looper motors that OMC made without the injection type pumps they used 2 of the standard pumps much like on a V6 crossflow from the late 70's & 80's. Loopers live on fuel pressure & volume. On any we run we even change out the small "looper" needle & seats for the crossflow seats with larger inlets. I'm just concerned about leaning out a cylinder.

  16. #16
    Supreme Mariner kenmyfam's Avatar
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    Default Re: Now a Pre-Mixer. (Photos)

    Sorry for the none response but have driven from Ontario to Alabama today and am just checking in before sleeping. The pump was from a 1982 150hp and the pulse line is the same one that was on the previous pump
    Hope that makes sense as I am really tired. Will check in again as soon as I can.
    Ken
    Last edited by kenmyfam; December 29th, 2009 at 09:08 AM.
    Marada 2100 Executive Series, 5 Litre V8 with Mercruiser Alpha 1 outdrive. 2007 K-Z Spree 260 RBH, all = a whole lot of family fun !!!!

  17. #17
    Supreme Mariner kenmyfam's Avatar
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    Default Re: Now a Pre-Mixer. (Photos)

    Pump being used has 3 connections.
    1 for premix fuel from the tank
    1 from the pump to the carbs
    1 for the pulse line from the original VRO
    I was told it is from a 1982 150hp Johnson.

    I figure that volume should not be an issue as both pumps are from motors that can eat 14 + gallons per hour at WOT.
    It is running really well if not slightly better than it ever has. It is a little smokey at idle and trolling on the premix but we dont really do much of that. At least i know it is getting enough oil.
    Last edited by kenmyfam; December 29th, 2009 at 09:09 AM.
    Marada 2100 Executive Series, 5 Litre V8 with Mercruiser Alpha 1 outdrive. 2007 K-Z Spree 260 RBH, all = a whole lot of family fun !!!!

  18. #18

    Default Re: Now a Pre-Mixer. (Photos)

    Hey I am new to the forum. I found lots of good info here for other repairs but have recently had vro fuel pump issue and decided to ditch the oil injection for a regular pump. My local mechanic has no time to do it so I going it on my own. My question is this . the pump clearly shows a fuel inlet and a fuel outlet but the middle hole in the back between the mounting holes must be for pulse line hook up from the crankcase. can anyone confirm this for me. Its not threaded so it looks a little confusing. I am installing on 1991 90hp evinrude.


    Thanks

  19. #19
    Fleet Admiral HighTrim's Avatar
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    Default Re: Now a Pre-Mixer. (Photos)

    Welcome to iboarts SSMAC.....

    start yourself a new thread and you will get maximum help

  20. #20
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    Default Re: Now a Pre-Mixer. (Photos)

    The 1991 88 & 90 HP models had an optional conventional lift pump that mounted directly on the intake manifold and used the pulse directly from behind the fuel pump (PN 433387), thus requiring no hose.

    You should find have a place on the intake manifold just below the pulse fitting for your VRO that has two threaded screw holes in line with the pulse hole and that pulse hole will be blocked.

    You need to block the VRO pulse fitting and open the lift pump hole and the only lines you will need are the incoming and outgoing fuel. Obviously, you will not need a bracket to hold the pump.

  21. #21

    Default Re: Now a Pre-Mixer. (Photos)

    thanks chris still trying to figure out hoe to ask for help

  22. #22
    Seaman miker-gr's Avatar
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    Default Re: Now a Pre-Mixer. (Photos)

    Can somebody tell me what exactly the "pulse line" do???

  23. #23
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    Default Re: Now a Pre-Mixer. (Photos)

    Lift pumps, VRO pumps and and OMS pumps are all driven by the movement of one of the pistons. This creates alternative vacuum and compression which can be used to move a membrane inside the fuel pump, driving the pump.

    Some fuel pumps require an additional hose to handle the pulse, others are mounted directly to the intake manifold and get the pulse from a hole behind the pump.

  24. #24
    Seaman miker-gr's Avatar
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    Default Re: Now a Pre-Mixer. (Photos)

    Quote Originally Posted by ezeke View Post
    Lift pumps, VRO pumps and and OMS pumps are all driven by the movement of one of the pistons. This creates alternative vacuum and compression which can be used to move a membrane inside the fuel pump, driving the pump.

    Some fuel pumps require an additional hose to handle the pulse, others are mounted directly to the intake manifold and get the pulse from a hole behind the pump.
    ezeke

  25. #25
    Seaman Apprentice
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    Default Re: Now a Pre-Mixer. (Photos)

    Dhadley??.............a carb kit,.fits a particular eng,...how is it,....that u fumble around w/the needle and seats...........in effect,they are prob the same for 70--250??

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