Rajan Wilcox
When it comes to boating, one of the most important considerations is the placement of the fuel tank. While some opt for below-deck tanks to save space and lower the center of gravity, others prefer the convenience and
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Weight distribution
When considering the weight distribution of a boat deck above a fuel tank, several factors come into play. Firstly, it is crucial to understand the impact of fuel weight on the vessel's overall weight capacity and handling. Fuel weight can significantly affect a boat's carrying capacity and how it handles. For instance, one U.S. gallon of regular gasoline weighs approximately 6.1 pounds, so adding 40 gallons of gas adds about 244 pounds to the boat's weight. This additional weight can alter the boat's handling characteristics and impact its stopping distance.
The placement of the fuel tank in relation to the boat's center of balance is another critical factor in weight distribution. The general rule of thumb is to keep the tank "low and in the center" for stability reasons. Mounting the tank near the stern or too far from the center of balance can make the boat top-heavy and affect its handling, especially in rough waters. Therefore, some boat owners prefer to mount the tank towards the front of the boat to offset the weight of a heavy outboard motor and improve fuel consumption.
To optimize weight distribution, some boaters opt for multiple smaller tanks strategically placed around the boat. This setup allows for equal distribution and helps balance the weight. For example, side-mount tanks can be positioned in the center of the boat to distribute weight evenly. Additionally, the use of custom-built tanks or flexible bladders can provide more flexibility in weight distribution and space utilization.
It is essential to carefully consider the weight of the fuel and the placement of the fuel tank to ensure optimal weight distribution and handling of the vessel. The specific design and requirements of the boat will dictate the best approach to weight distribution, and in some cases, it may be necessary to consult experts or manufacturers for advice.
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Stability
The stability of a boat is a crucial consideration when deciding to place a fuel tank above the deck. The weight distribution and balance of the boat can be significantly impacted by the placement and number of fuel tanks.
One option to consider is having two above-deck tanks, one on each side under the seats or gunwale. This can help distribute weight evenly and prevent the boat from becoming too heavy in one area, improving stability. Additionally, the weight of the fuel can offset other heavy equipment on the boat, such as an outboard motor, further enhancing stability and fuel consumption.
However, it is important to be cautious when placing fuel tanks above the deck as it can lower the centre of gravity and reduce the stability of the vessel. This is especially true for large boats, where the weight of the fuel tanks can add a significant amount of weight above the centre of buoyancy. To mitigate this, some boats may opt for a below-deck fuel tank to keep the weight lower and improve stability.
Another factor to consider is the type of fuel tank used. Low-profile fuel tanks can provide more stability in rough seas, and plastic tanks can be preferable to metal ones as they do not damage the paint job. Additionally, flexible bladders can be used as collapsible fuel tanks, saving space once they are empty.
Lastly, it is essential to secure fuel containers, especially in open areas of the boat, to prevent them from moving excessively and rupturing. This can further impact the stability of the boat and cause safety hazards.
Overall, when deciding to place a fuel tank above the deck, careful consideration of the boat's stability is necessary. The weight distribution, type of fuel tank, and secure placement can all impact the boat's stability and should be carefully assessed to ensure a safe voyage.
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Noise insulation
The engine is the primary source of noise on a boat, and this is exacerbated by wind noise and vibrations from water hitting the hull. Insulating the engine bay compartment is a great way to reduce noise.
Firstly, identify the source of the noise. The engine is the primary source of noise on a boat, but wind noise and vibrations from water hitting the hull can also contribute. Continuous exposure to noise above 80 decibels can cause nausea, fatigue, increased blood pressure, and insomnia. Therefore, it is important to address these issues and create a more pleasant and relaxing ride.
Secondly, flexible mounts can be used to isolate the vibrating machinery from the hull. This helps prevent the transmission of vibrations through the solid structure of the boat, reducing the reverberation of hull sections that can amplify noise.
Next, enclose the noise-producing machinery in a tight, insulated enclosure to reduce air-transmitted noise. Sound-absorbing materials can be added to the engine bay compartment to further reduce noise levels. Hard surfaces reflect sound waves, so by absorbing echoes, there will be less sound pressure inside the compartment and less sound escaping.
Finally, line the enclosed living quarters, such as cabins, with sound-absorbent materials. This will help to reduce airborne noise and create a more comfortable environment for conversation and relaxation. It is important to note that any soundproofing installation must provide adequate ventilation for the engine to prevent reduced power, engine damage, or worse. Additionally, ensure that the insulation material is kept above bilge water levels and is flame retardant to prevent mould and moisture retention.
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Tank placement
Below-deck fuel tanks have the advantage of being out of the way and can help lower the boat's centre of gravity, which may improve stability. However, they often require more effort and money to install and maintain. It is important to create an access hatch for removal or repairs, and if using a poly tank, one must follow the instructions carefully as they can expand when exposed to fuel.
Above-deck fuel tanks are generally easier to mount and deal with. They are more accessible for refuelling and checking fuel levels, and if there are any leaks or issues, they are easier to spot and fix. However, they take up valuable deck space and may impact the boat's stability, especially if placed near the stern or combined with the weight of a motor.
Some boat owners prefer the weight distribution of having the tank up front, which can offset the weight of an outboard motor and improve fuel consumption. It also reduces concerns about loading and where people sit. On the other hand, placing the tank near the bow may make refuelling more challenging.
When installing an above-deck fuel tank, it is important to ensure that the tank and fill neck ring are grounded to prevent sparking during refuelling. Custom-building a tank into the floor should also include access panels for future inspections and maintenance.
The number of tanks is another consideration. Multiple tanks can improve weight distribution, especially if the boat has wide gunwales that can accommodate saddle tanks. However, this may also increase concerns about space, cosmetics, and stability, especially in rough waters.
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Fuel gauge visibility
When installing an above-deck fuel tank, it is essential to consider the placement of the fuel gauge to ensure easy visibility and accessibility. The fuel gauge should be located in a convenient spot on the dashboard, allowing you to monitor the fuel level at a glance.
Fuel Sender Unit:
The fuel sender unit is a critical component of the fuel gauge system. It is usually located directly under a composite pie-style deck plate in small recreational boats. To test the fuel sender unit, follow these steps:
- Shut off the main battery switch to prevent any current flow while working near the fuel tank.
- Disconnect the sender unit and test its resistance with a multimeter. The resistance should vary according to the fuel level. For example, when the tank is full, the resistance should be low (0-90 ohms), and when empty, it should be high (240 ohms).
- If the sender unit and wiring are functional, the issue may lie with the gauge itself.
Replacing the Fuel Gauge:
If the fuel gauge is faulty and needs replacement, follow these steps:
- Remove the faulty gauge from the dashboard.
- Disconnect the wiring and take note of the connections for the new gauge.
- Install the new gauge and reconnect the wiring, following the diagram provided by the manufacturer.
- Verify the gauge's functionality by filling the tank and monitoring fuel use.
Fuel Gauge Types:
Fuel gauges in recreational boats can be analog or digital. Digital gauges may have a calibration feature, but the level detection principle remains the same. It is important to note that fuel gauges in boats are more of a guide and can be affected by factors like boat attitude.
Troubleshooting Common Issues:
If your fuel gauge always reads full, it could be due to an open circuit, no resistance, or a bad ground. Here are some troubleshooting steps:
- Check and clean the ground connection first.
- Test the resistance of the gauge and refer to the make and model's specified values.
- Go to the sending unit for the tank (usually an access deck plate) and remove the pink wire with the key on. The gauge should now read zero.
- Touch the pink wire to the tank ground. If the gauge responds correctly, the issue is resolved. If not, double-check the ground connection.
- If the gauge still doesn't respond, the issue may lie with the tank wiring to the gauge.
Above Deck Fuel Tank Options:
When selecting an above-deck fuel tank, consider options that provide fuel level visibility. For example, Moeller offers above-deck fuel tanks with manual swing arm sight gauges, providing a visual indication of the fuel level. These tanks are made from high-density polyethylene and are designed for specific boat types, ensuring compliance with industry standards.
By following these instructions and selecting appropriate above-deck fuel tanks, you can improve fuel gauge visibility and ensure a safer and more informed boating experience.
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Frequently asked questions
An above-deck fuel tank is easy to mount and deal with, and if the fuel gauge stops working, you can just look over your shoulder and see the fuel through the tank.
One disadvantage of an above-deck fuel tank is that it may cause the boat to become too top-heavy. Another is that you may be able to hear the fuel sloshing around, although this can be mitigated with insulation or soundproofing.
A below-deck fuel tank is out of the way.
