Regan Brown
The Yamaha SuperJet is a Waverunner that comes in different models, such as 650, 701, 760, and 1100. The fuel system in the SuperJet is a critical component, and proper fuel line routing is essential for its optimal performance. Understanding the correct routing of fuel lines ensures the efficient delivery of fuel to the engine and prevents potential leaks or malfunctions. This topic will explore the specific routes and connections of the fuel lines in the Yamaha SuperJet, addressing common challenges and providing insights into maintaining and optimizing the fuel system's performance.
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What You'll Learn
Fuel line routing issues
When it comes to the Yamaha Superjet, there are a few fuel line routing issues that you should be aware of. One common problem is fuel line length. If your fuel lines are too long, it can force the fuel to run uphill, which can lead to flow restrictions and other issues. To prevent this, ensure that your fuel lines are the correct length and that there is enough space for all the hoses. Consider using 90* fittings to help with routing and manage the amount of space needed.
Another issue that can occur is vapor lock. This can happen when a petrol tube loops up and the fuel lines get too close to the cylinders or head, especially if they touch. To prevent vapor lock, keep your fuel lines away from the cylinders and head, and consider using a different type of fuel tubing, such as smooth Nitrile rubber fuel tubing, which is more flexible and less bulky than reinforced nitrile rubber.
Additionally, it is important to have a stop valve in place. Without one, you run the risk of flooding the crankcase via the piston ring path if the carburetor float valve sticks open. A stop valve can help prevent this issue and ensure the safe operation of your Yamaha Superjet.
Furthermore, issues with the return line are also common. If your return line is plugged, it can cause problems with fuel flow. To fix this, it is recommended to get it ultrasonically cleaned to remove any debris or garbage that may be causing the blockage. You may also need to drill the return line to allow the fuel to flow through properly. However, be careful not to drill too large of a hole, as this can affect the fuel restrictor's function.
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Fuel selector position
The fuel selector position on a Yamaha Superjet is important for ensuring proper fuel flow and engine performance. The fuel selector valve has three positions: "On," "Off," and "Reserve." These positions correspond to the fuel lines coming from the tank, which are labelled "On" and "Res" (short for Reserve).
When the fuel selector is in the "On" position, the ski engine receives fuel through the "On" line. This is the normal operating mode when the fuel tank is expected to have sufficient fuel. However, if the "On" pickup is clogged or the fuel level is too low, the engine may not receive enough fuel, leading to performance issues.
In the "Reserve" position, the ski engine draws fuel from the "Res" line. This line is designed to allow access to the fuel at the bottom of the tank, ensuring that the engine can still receive fuel even when the fuel level is low. The "Reserve" position is typically used when the ski is in the water, and it is important to switch back to the "On" position once the ski is out of the water to prevent air leaks.
It is important to note that the "On" and "Res" pickups differ only in how low they sit in the tank. Therefore, if the "On" line becomes clogged or the fuel level is very low, switching to the "Reserve" position can help maintain fuel flow to the engine.
The "Off" position on the fuel selector valve stops the flow of fuel to the engine, effectively shutting off the fuel supply. This position is typically used when the engine is not in use or when performing maintenance or repairs on the fuel system.
It is worth mentioning that the knob selector positions may vary depending on the installation. In some cases, the knob selector may have left, down, and right positions, with left being "On," down being "Off," and right being "Reserve." However, if the knob has been turned 180 degrees, the positions change accordingly, with left becoming "Reserve," up being "Off," and right being "On."
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Fuel pickup tubes
The Blowsion Yamaha Fuel Pickup is a lightweight, low-profile solution for Yamaha Superjet fuel systems. It features heavy-duty O-ringed tank and fuel cap seals, as well as fuel pickup tubes and filters. The filters ensure that fuel can be retrieved even in challenging conditions, and the pickup tubes can be trimmed to suit the specific carburetor setup and fuel demands. For example, the tubes can be used as a reserve line, return line, or tank vent. The Blowsion Fuel Pickup is designed for use with single, dual, or triple pickup configurations, and it fits all models of the Yamaha Super Jet & Waveblaster B1 from 1990 to the present.
The fuel pickup tubes play a crucial role in ensuring a consistent and reliable fuel supply to the engine. They are responsible for drawing fuel from the tank and delivering it to the engine's fuel system. The tubes are typically made of durable materials that can withstand the fuels' corrosive nature and are designed to maximize fuel pickup depth, increasing the runtime of the watercraft.
The ability to trim the pickup tubes is an important feature offered by the Blowsion Fuel Pickup system. This flexibility allows riders to customize the fuel system to their specific needs. For instance, trimming the tubes allows them to function as a reserve line, drawing fuel from the deepest parts of the tank to ensure the engine can access every last drop. Additionally, the tubes can be used as a return line, facilitating the flow of excess fuel back to the tank, or as a tank vent, helping to regulate the pressure within the fuel system.
The versatility of the Blowsion Fuel Pickup tubes is further enhanced by their compatibility with both single and OEM Yamaha carbs. This means that regardless of the specific carburetor setup, the pickup tubes can be easily integrated into the existing fuel system without the need for any modifications to the OEM tank. This makes the Blowsion Fuel Pickup a convenient and efficient option for Yamaha Superjet owners looking to optimize their fuel system's performance.
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Fuel line hose kits
If you own a Yamaha Superjet, it is important to pay attention to the fuel lines. The stock grey lines are known to destroy carbs and engines, resulting in poor throttle response, bogging, and eventually a blown motor. To prevent this, it is recommended to replace the grey fuel lines and original oil lines as soon as possible.
JLP offers a full fuel line hose kit for the Yamaha SuperJet Waverunner 650, 701, 760, and 1100 models. The kit includes 20 feet of high-quality polypropylene hose in either translucent red or green. The hose will not break down with modern fuels and is designed to last longer than OEM hoses. It also comes with 10 nylon zip ties that can be used in place of hose clamps. This kit provides enough line and ties to replace the entire fuel system on any 2-stroke Sea-Doo models 580/580, 650/657, 717/720, and 787/800.
When routing the fuel lines on a Yamaha Superjet, there are typically three lines: the bottom line is fuel in, the middle is pulse, and the top is fuel return. However, some users have suggested bypassing the fuel selector by running a line from the reserve pickup to the fuel pump and then running the return line back to the tank and the pulse line from the intake to the pump. This method eliminates the need for the fuel selector.
It is important to note that proper fuel line routing and maintenance are crucial for the safe and efficient operation of your Yamaha Superjet. Always refer to the official Yamaha Superjet manual or seek assistance from a qualified technician if you are unsure about any procedures.
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Fuel filter maintenance
The fuel filter in a jet ski needs to be replaced regularly to prevent clogging and ensure an uninterrupted flow of fuel to the engine. This is a fairly inexpensive process but it can make a significant difference in the performance of your jet ski.
To replace the fuel filter, first drain any settled fuel from the filter and then replace it with a new one. This process is important to rid your fuel system of unwanted debris that can clog your fuel lines and carburetor. High-flow fuel filters are available for this purpose, which also serve as a water separator to protect your motor from water damage.
In addition to replacing the fuel filter, it is also important to maintain the fuel tank and add a fuel stabilizer to your jet ski, especially when it is stored for extended periods. The stabiliser prevents fuel from deteriorating and causing potential engine problems.
Other aspects of jet ski maintenance include changing the engine oil and oil filter, replacing spark plugs, lubricating moving parts, and applying grease to seals and bearings. Regular jet ski maintenance is crucial for optimal performance and rider safety. A well-maintained jet ski performs better and lasts longer.
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Frequently asked questions
The Blowsion Yamaha Fuel Pickup can be used as a single, dual or triple pickup. It features heavy-duty O-ringed tank and fuel cap seals, fuel pickup tubes, and two filters for maximum pickup tube depth. The pickup tubes can be trimmed and used for the reserve, return, or tank vent lines.
The JLP Yamaha SuperJet Waverunner 650 701 760 1100 Full Fuel 1/4 Gas Line Hose Kit is a good option, available in purple or translucent red. The kit includes 20 feet of polypropylene hose and 10 nylon zip ties.
One option is to bypass the fuel selector by running a line from the reserve pickup to the fuel pump, then running the return back to the tank and the pulse line from the intake to the pump.
