Katerina Swanson
The VRO fuel pump is a popular choice for boat engines, however, some users have expressed concerns about its reliability and have opted to replace it with a standard fuel pump. When making this conversion, it is important to disconnect and cap the oil line to prevent air from entering the system. Additionally, it is recommended to install an inline fuel filter to ensure the fuel is properly filtered before it reaches the engine. While some people choose to purchase a replacement pump, others opt for more affordable options or decide to mix their fuel manually.
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What You'll Learn
Converting a VRO pump into a straight fuel pump
The Vapor Reduction System (VRO) pump can be converted into a straight fuel pump, but it is a complex process. It involves eliminating the oil tank and VRO pump warning system, but retaining the overheat warning setup. Here is a step-by-step guide:
Firstly, cut and plug the oil line at the engine to prevent the oil side of the VRO pump from drawing air into its system. Trace and disconnect the wires from the back of the VRO to its rubber plug. Next, trace, disconnect, and remove the wires from the oil tank to the engine, along with the oil tank itself.
At this stage, you should mix the 50/1 oil with the required quantity of fuel. Disconnect the fuel line at the engine and pump the fuel primer bulb until the fuel exits the hose, tinted with the oil.
Now, you can reconnect the fuel hose. If desired, test the heat warning system by grounding out the tan heat sensor wire with the key in the 'on' position. The warning horn should sound.
There are a few additional considerations to keep in mind. Firstly, ensure that you are comfortable with the setup and take the route that makes you feel at ease. Secondly, this conversion involves working with older equipment, so it is recommended to consider replacing the VRO pump with a new single-chamber pump used on pre-VRO engines for improved reliability. Finally, when troubleshooting and performing maintenance, refer to a factory service manual to avoid issues.
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Replacing a VRO pump with a standard diaphragm pump
To replace a VRO pump with a standard diaphragm pump, the following steps can be taken:
- Cut and plug the oil line at the engine to prevent air from entering the system.
- Disconnect the wiring to the VRO and oil intake, and plug the oil intake at the VRO.
- Remove the VRO pump and purchase a suitable standard diaphragm pump as a replacement.
- Install the new standard diaphragm pump, ensuring that all hoses and connections are secure.
- Test the new pump to ensure it is functioning correctly.
It is important to note that when replacing a VRO pump with a standard diaphragm pump, the number of hoses and connections may be reduced. Additionally, a fuel filter may need to be installed in-line, as the VRO pump's fuel filter is often removed during the conversion.
When performing this conversion, it is crucial to consult appropriate resources and seek assistance from knowledgeable individuals to ensure the process is completed correctly and safely.
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VRO pump failure
The VRO (OMS) automatically mixes oil and gas and sends the fuel mixture to the carburetors. The pump itself does not require any mechanical maintenance, but the VRO system should be inspected occasionally for cracked lines, leaks, and broken clamps. One of the most common causes of engine failure is water in the remote oil tank.
Symptoms of an impending VRO failure include alarms, low oil consumption, and sudden engine shutdown after a short period of operation. In some cases, the engine may run at idle for a few minutes before dying again.
To address VRO pump failure, some users have chosen to replace the VRO pump with a standard diaphragm pump, which can be more cost-effective and easier to install. This conversion involves cutting and plugging the oil line, disconnecting wires, and mixing fuel and oil manually.
It is important to note that while the VRO pump can be rebuilt, the oil pump cannot, according to some sources. Therefore, taking preventive measures, such as regular inspections and addressing any signs of potential failure, is crucial to avoid unexpected breakdowns.
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VRO pump conversion kits
A VRO pump can be converted into a straight fuel pump. This can be done by eliminating the oil tank and VRO pump warning system while retaining the overheat warning setup. Here is a step-by-step guide for the conversion:
- Cut and plug the oil line at the engine to prevent the oil side of the VRO pump from drawing air into its system.
- Trace the wires from the back of the VRO to its rubber plug (electrical plug) and disconnect it.
- Trace the two wires from the oil tank to the engine, disconnect those wires, and then remove the oil tank.
- Mix the 50/1 oil with the appropriate amount of fuel.
- Disconnect the fuel line at the engine and pump the fuel primer bulb until the tinted oil exits the hose.
- Reconnect the fuel hose.
It is important to note that you can test the heat warning system by having the key in the "on" position and grounding out the tan heat sensor wire protruding from the cylinder head.
There are also VRO to premix conversion fuel pump kits available online, such as the Johnson Evinrude VRO to Premix Conversion Fuel Pump Kit 5007422. This kit is available on maxrules.com and has installation videos on YouTube.
Additionally, there are VRO2® Pump Kits available from Crowley Marine that service a VRO2® pump with a 4-wire warning system or a "VRO® style" fuel-only pump.
When it comes to the question of whether to convert a VRO pump or purchase a new single-chamber pump, it is a judgement call that each individual must make based on their specific needs and preferences.
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VRO pump replacement parts
The VRO pump is a fuel pump used in marine engines. It can be used as a regular fuel pump with premix. To do this, the oil line must be disconnected and capped, and the wiring to the VRO disconnected.
There are several VRO replacement fuel pump kits available for Johnson/Evinrude 25-140hp 90-degree outboards. These kits are designed to replace the VRO fuel pump, which can be expensive. The kits are compatible with a range of VRO pump part numbers, including 0438404, 0435554, 0174875, 0174725, 0174568, 0174262, 5004562, and many others.
It is also possible to repair a VRO pump with a rebuild kit, which can save money. These kits include new air and fuel diaphragms, and are constructed of high-quality plastic and metal for durability. However, one user reported that the repair kit they purchased failed after 45 minutes of use, leaving them stranded.
When replacing a VRO pump with a standard fuel pump, it is necessary to remove the pulse limiter nipple, unplug the VRO wire harness, and plug the pulse limiter tap. A new fuel pump can be purchased for a lower price than a VRO pump, and may include mount screws and a gasket. It is also recommended to purchase a new fuel filter and hoses.
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