Vro Pump Conversion To Straight Fuel Pump
One of the most common causes of engine failure is water in the remote oil tank. Public perception fed by uneducated mechanics put the blame for almost every engine problem on the VRO. Even though they are not listed in the parts catalogs, most of the diaphragms are interchangeable. Can I remove this vapor separator non-sense and plumb the fuel pump outlet straight to the carbs like an older motor? OMC also makes a wiring harness adapter (P/N 174710) for the 1984 and 1985 engines that did not have any warning systems. VRO replacement and no fuel pressure fix. I had it disconnected on my motor and never had any problem with the motor!!! Changes are periodically added to the information herein. If you have a cross-flow engine with a VRO pump, this is doable. CDI Electronics' #551-34PV gearcase vacuum/pressure tester work well, as does a SnapOn YA-4000 or the old Stevens pumps. Vro pump conversion to straight fuel pump kit. The pressure (white area) on one side of the piston rushes into the vacuum side (tan area) as the large spring quickly pushes the piston back to its starting point. As you run out of fuel, the oil still pumps, filling the lines and carbs with your favorite TC-W3 lubricant.
- Vro pump conversion to straight fuel pulp fiction
- Vro replacement fuel pump
- Vro pump conversion to straight fuel pump kit
Vro Pump Conversion To Straight Fuel Pulp Fiction
On V-6's a constant horn at high speeds that disappears instantly when the throttle is pulled back indicates a fuel restriction. Vro pump conversion to straight fuel pulp fiction. By the way, the SystemCheck® can be adapted (with accessory kit P/N 176709) to any engine with a four-wire VRO pump. Gasoline reformulation in those early years contained alcohols and solvents that softened the internal rubber components and caused pump failures and damaged engines. Of all the traditional two stroke outboards produced worldwide, OMC products have the only automatic lubrication systems with a "no oil flow" alarm. Replace the VRO fuel pump with a simple fuel only pump.
One beep every 20 to 40 seconds is a low oil level in the remote tank. I have a 1984 Evinrude GT150 and they disconnected the VRO but didn't put a fuel pump on it. Air leaks and/or fuel restrictions will affect the VRO and usually show up as excessive oil consumption, smoking, and fouling plugs. Replace a VRO pump with a standard fuel pump. I have been running premixed gas with the original VRO pump successfully. It consists of four basic sections: Cutaway View of VRO Pump Showing Major Components.
But I just dropped a cylinder and now am trying to find a good used 150 or 175 for the boat before I sell it. No matter what happened to a motor, someone would utter ".. be a bad VRO. Some installations even had 5/16-inch fuel line squeezed down over the smaller fittings. ) This makes them more efficient, but also required a special fuel pump. So, contrary to boat ramp "urban legends", the VRO pump is a simple and reliable oiling system that has been standard equipment on most OMC outboards from 40- to 300-HP for the past 20 years. VRO STORY—The Myth of the Mixer. VRO to Pulse Pump on Johnson 115. A typical conversation that we've all heard at one time or another might go something like this: For instance, the first boat owner's problem (1) is an air leak somewhere in the boat's fuel system causing "foamy" fuel instead of a solid column of liquid. Early systems had a smooth vinyl oil line that hardened after a few years and sometimes caused air leaks. Reconnect the fuel hose. The air motor diaphragm kit is part number 435921 and the fuel pump repair kit is 436095. If it has a black face on it, replace it with a blue style (OMC P/N 435009).
Vro Replacement Fuel Pump
The quickest and easiest test is the grounding of the tan overheat temp switch wire to the engine block. Check and test the boat's fuel system for restrictions and/or air leaks, and make sure the oil tank is clean. 3 - Mix the 50/1 oil in the proper amount with whatever quanity fuel you have. Here is the instructions I've found to disable it: ********************. The ratchet clamps (OMC P/N 322654) give the best seal and full 360-degree clamping action. One of the bones OMC owners like to pick concerns the oiling system. Of course a steady tone at all speeds is an overheat condition. Should I disable my VRO. Are there more than one? OMS pumps have a blue/gray outlet nipple or a blue/gray pulse nipple, or a black fitting held in place by an oval metal bracket and two Torx headed screws. Can anyone help me get a part number?
I've heard a lot of people say yes, do it ASAP. Other suggestions: Johnson/Evinrude VRO Fuel Pump Conversion. Follow the pulse line from the VRO to the engine block and look for a hex shaped fitting threaded into the crankcase. The factory does not endorse spark plug manufacturer's conversion charts. Whenever there is a gathering of boaters, the conversation usually turns to engines, then gravitates to stories about problems. The original VRO from 1984 and 1985 had a black fuel outlet fitting and no wiring. Vro replacement fuel pump. A long standing practice was to pre-mix the gasoline and oil together in the boat's fuel tank. As the oil flows into the fuel area, the pressure moves a small piston that actuates a steel pin in the alarm module. A fuel restriction such as from a bad anti-siphon valve, kinked line, or a partially plugged filter does not allow a full charge of gas to be drawn into the fuel pump cavity. "Took out two cylinders on his V-6. Be sure to read and understand the service manual before doing any of these procedures.
Senior Refuge Member. Again, you get the full shot of oil mixing with less gas. Has anyone made a similar switch or conversion? I dont need this to fix to be "by the book", I need to get on the water and get use out of the boat and engine. "Come to think of it, " the third member of the group chimes in, "my brother-in-law's offshore rig with twin outboards must have a flaky VRO; one motor always uses more oil than the other. Since 1993, the VRO is actually called an oil metering system (OMS). You can also replace the clear plastic cap with the later model's solid black filler cap (OMC P/N 176217) that provides much better water intrusion resistance. The VRO2® was introduced in 1986 and included a "NO OIL FLOW" alarm. The new pump (P/N 5004558) contains various fittings for different outboards, and each internal part is replaceable for easier and less expensive servicing. Changes included an electronic circuit to compare the oil pulses with the engine's RPM, a better oil pump piston, alcohol resistant seals, and a brown fuel outlet for recognition.
Vro Pump Conversion To Straight Fuel Pump Kit
Actually, he only needs a refresher in the correct starting procedure. There is no nipple to attach a regular piece of fuel line. So basicaly at this point, with the help of friends who know more, I want to switch out the VRO for a cheaper standard fuel pump. Also, pre-mixing set the gasoline-oil mix to a fixed ratio, typically 50:1. If an oil tank is exposed to the elements such as in an open boat, installing the tank inside a covered battery box will protect it from spray. I have ruled out the fuel line from tank to outboard, replaced line and primer bulb, followed instructions posted on a threads here to disconect the oil side of the VRO, and am now mixing 50:1 in the gas tank. "Uh huh, my neighbor had a blown engine, " quips another. Each cycle pulses oil into the foamy mix, increasing the oil:fuel ratio to the carbs creating a smoky exhaust.
The information, software, products, and services published on this web site may include inaccuracies or typographical errors. A system with 3/8-inch fuel lines, a clean "spin on" filter, and a quality anti-siphon valve should show between 2. Late-model OMC's use a double-wire wound spring clamp (#339277) that also works well in keeping lines air tight. The horn sounds for 10 seconds when a fault occurs and the proper light stays on until the problem is corrected.
Trace the wires from the back of the VRO to its rubber plug (electrical plug) and disconnect it. These air leaks can also trigger "NO OIL" alarms, commonly at startup, idle, and trolling speeds. Actually the engine works great when I become the fuel pump, but my hand gets tired and it's not allways easy to know where I'm going when I'm pumping the ball. The operator just had to keep the oil reservoir full and oiling would be done automatically. The inline replacement is OMC P/N 435010. Gasoline is drawn into the blue area of the chamber, travels through the piston's flapper valve, and is pressurized in the green section on the following stroke. They are calibrated for each model of pump. Each OMC (VRO) kit contains the parts needed including a new pulse limiter to install the system correctly. This article discusses the history of OMC outboards with VRO, the theory of VRO operation, and the diagnosis and repair of common problems.