Choosing The Right Spot For Your Boat's Fuel Tank

When it comes to boat fuel tanks, there are two main types: permanent and portable. The location of your fuel tank will depend on a variety of factors, including the type of boat you have, the size and weight of the tank, and personal preference. Permanent fuel tanks are usually found under the deck of stern drive and inboard boats, while smaller outboard-powered boats often use portable fuel tanks that can be removed for refuelling. When deciding where to put your boat fuel tank, it's important to consider the weight distribution and balance of your boat, as well as safety precautions to prevent leaks or explosions. Some boat owners choose to install auxiliary fuel tanks to increase their range and fuel capacity, especially for multi-day trips or remote locations.

Stern drive and inboard boats have permanent fuel tanks under the deck

Stern drive and inboard boats are equipped with permanent fuel tanks that are usually located under the deck. These tanks are not meant to be removed. They are usually made of aluminium, fibreglass, or plastic, and are secured with hold-down straps. Stern drive and inboard boats are not the only types of boats to have permanent fuel tanks under the deck. Below-deck fuel tanks are also available for outboard boats.

A typical permanent fuel system consists of a fuel tank, a deck fill fitting (including the gas cap), a fuel fill hose (from the deck fill fitting to the fuel tank), a thru-hull vent fitting (which allows fuel vapours to vent outside of the boat), a vent hose (from the fuel tank to the vent fitting), a fuel hose (from the fuel tank to the engine), a primer bulb (a manual hand pump from the fuel tank to the engine), fuel fittings (to attach hoses to the fuel tank), and a fuel sending unit (an electrical device that tells the gas gauge how much fuel is in the tank).

Permanent fuel systems are often overlooked during routine maintenance, but they require a moderate amount of upkeep. Potential problem areas include dropping the gas cap into the water during refuelling, and hoses and primer bulbs (especially those exposed to the elements) tend to crack and develop leaks over time. A fuel gauge malfunction may also indicate an issue with the fuel sending unit.

When it comes to long-term boat storage, proper fuel treatment is key. It is recommended that boats are stored with the fuel tank almost full, leaving a little capacity to accommodate the expansion of the fuel if the temperature warms. Filling the tank displaces any air in the tank and prevents condensation from forming inside, which can occur if the boat is stored outdoors or in an unheated building. To prevent condensation, it is also important to use gasoline that does not contain ethanol and to add a marine-specific fuel stabilizer additive.

Portable fuel tanks are refillable off the boat

Marine fuel tanks are either permanent or portable. Stern and inboard boats are equipped with permanent fuel tanks that are fixed under the deck. On the other hand, portable fuel tanks can be removed from the boat for refuelling.

After refuelling, connect the tank to the engine and secure it with straps to prevent it from moving. It is important to always store portable fuel tanks out of direct sunlight and in a cool, dry place to minimise condensation. Keep the tank in a well-ventilated area, away from the engine and electrical equipment.

To ensure safety, clear the area of anyone not involved in the refuelling process. Put out all smoking materials and secure the boat to the dock. Turn off the engine and any electronics, and extinguish open flames. Keep all openings in the boat closed to prevent gasoline fumes from entering. After refuelling, open all doors, windows, and hatches to allow for air circulation.

Fuel tank placement affects a boat's centre of gravity

The placement of a boat's fuel tank is a critical aspect of boat design, as it directly impacts the vessel's centre of gravity, stability, performance, and safety. The centre of gravity refers to the point where the entire weight of the boat is directed vertically downward, and it plays a vital role in how the boat responds to various forces, such as waves and wind.

By placing the fuel tank in a specific location, designers can influence the boat's handling and performance characteristics. For example, positioning the fuel tank towards the front of the boat can help distribute weight more evenly, reducing the risk of capsizing and improving stability. This is especially important for powerboats, where high speeds and manoeuvrability require a well-balanced centre of gravity.

In some cases, boat owners might consider using portable fuel tanks, which can be placed in different locations to adjust the weight distribution. This flexibility can be advantageous for boats with varying cargo loads or changing passenger numbers, as it allows for real-time weight adjustments to optimise the centre of gravity.

Additionally, the size and shape of the fuel tank can also impact the boat's centre of gravity. A larger or longer fuel tank placed in the rear of the boat, for instance, may raise the centre of gravity, affecting the boat's stability and increasing the risk of capsizing. Conversely, a smaller or T-shaped tank can help lower the centre of gravity, improving stability and reducing the chances of tipping over.

It is worth noting that personal preferences and boating conditions also play a role in fuel tank placement. Some boat owners prefer to have the fuel tank at the outboard rear, while others opt for under the front seat or in the bow to lower the front of the boat. Ultimately, the goal is to achieve a well-balanced centre of gravity that ensures the boat's stability, safety, and optimal performance in various marine environments.

Fuel tanks can be custom-made to fit a specific spot on the boat

Fuel tanks are an essential component of a boat's fuel system. While some boats come equipped with permanent fuel tanks, usually located under the deck, others may require custom-made solutions to fit specific spots. Custom fuel tanks can be designed and built to meet unique space and performance requirements, offering a tailored option for boat owners.

Custom-made fuel tanks offer several benefits to boat owners. Firstly, they can be designed to fit specific spaces on the boat, maximizing available space and ensuring a perfect fit. This is especially advantageous for boats with unique configurations or limited space, as custom tanks can be crafted to utilize every inch efficiently.

Another advantage of custom fuel tanks is the ability to meet specific capacity requirements. Boat owners can determine the desired length, width, depth, and thickness of the tank, ensuring it aligns with their fuel needs and available space. This customization can lead to more efficient fuel usage and extended operating ranges.

In addition, custom fuel tanks can be constructed from various materials, such as aluminum, fiberglass, or plastic, depending on the customer's preferences and requirements. Aluminum, for example, is known for its high strength-to-weight ratio and corrosion resistance, making it a popular choice for marine applications.

When considering a custom-made fuel tank, it is essential to work with reputable manufacturers who adhere to industry standards and regulations. The design and construction process should be transparent, allowing customers to review and approve each step before finalization. Additionally, customers should be provided with clear pricing information, including any additional costs for customization, shipping, or installation accessories.

In summary, custom-made fuel tanks offer boat owners the flexibility to optimize their fuel systems. By tailoring the tank to the boat's specific dimensions and requirements, owners can enhance space utilization, fuel capacity, and overall performance. With the option of custom fuel tanks, boat owners can ensure their vessel is equipped with a fuel system that meets their unique needs and expectations.

Flexible bladders are collapsible fuel tanks that can be rolled up when empty

Marine fuel tanks are either permanent or portable. Permanent fuel tanks are usually located under the deck and are not meant to be removed. Portable fuel tanks, on the other hand, can be taken off the boat for refuelling. Smaller outboard-powered boats commonly use portable fuel tanks.

Flexible bladders are a type of portable fuel tank. They are collapsible fuel tanks that can be rolled up when empty, making them highly convenient for storage and transport. These tanks are made of durable, heavy-duty fabrics, such as polyurethane fabric with reinforced seams, or heavy-duty urethane and/or nylon-coated geomembrane materials. They are designed to be folded or rolled up when not in use, requiring minimal storage space. When filled, they take on a pillow-like structure.

The flexibility of these tanks allows them to be used in a wide range of applications, including marine, military, industrial, and recreational settings. They are highly versatile, with sizing options ranging from 25 gallons to 210,000 gallons or more. This makes them suitable for both small and bulk fuel storage requirements.

Flexible bladders offer several advantages. They are lightweight and portable, making them easy to deploy in remote locations. Their collapsible nature also results in significant savings in shipping costs. Additionally, they are constructed using high-quality, fuel-compatible fabrics that provide a tough exterior and a reliable interior to handle fuel materials safely.

When considering the placement of a flexible bladder fuel tank on a boat, factors such as boat design, weight distribution, and personal preference come into play. Some boat owners choose to place the fuel tank at the rear of the boat, below the outboard, while others opt for the front or under the seat to improve weight distribution and overall space utilisation. Ultimately, the decision is influenced by the specific characteristics of the boat and the owner's preferences.

Frequently asked questions