Operating a small vessel often requires an extension of the standard capabilities laid down by the engine manufacturer. A regular built-in tank integrated into the outboard motor design rarely allows for long crossings or a full fishing day without refueling. fume-tankThis is a mandatory element of equipment for long-distance exits.
The use of an external container solves several critical tasks at once: from an elementary increase in the fuel reserve to improving the overall safety of the vessel operation. Built-in tanks They are often located in close proximity to hot engine parts, which creates a risk of overheating fuel, whereas the remote system allows you to place the tank in a cooler and ventilated compartment, this is especially true for hot climates and intensive work at high revs.
In addition, a heavy tank mounted in the bow or under the seat can compensate for the weight of the engine and passengers, improving the driving performance of the vessel. In this article, we will discuss in detail all aspects of choosing, designing and correctly installing an autonomous fuel system, so that your launch is predictable and safe.
Advantages of switching to an external fuel system
The main argument in favor of modernization is, of course, autonomyA standard tank of 1.2 to 2 liters, often packed with low-power engines, only lasts 40 to 60 minutes of full gas, is catastrophically short for a fisherman or tourist, and a 12, 24, or even 200 liter tank makes a boat a complete vehicle capable of traveling tens of kilometers without stopping.
⚠️ Warning: Never rely on a built-in tank for long distances. Abrupt weather changes or headwinds can increase fuel consumption by one and a half times, and the regular volume simply will not be enough to return.
The second important factor is securityGasoline vapors are heavier than air and, when leaked from the built-in tank, can accumulate in the hold or for an outboard motor casing, creating an explosive mixture. The remote tank, especially if made of reinforced plastic or quality steel, is usually more sealed and placed in a specially designated, ventilated place, which minimizes the risk of ignition of vapors from sparks or overheating.
Also worth noting is the convenience of refueling: the neck of the built-in tank is often inconveniently located, and when refueling from the canister, there is a high risk of spilling fuel onto the hot engine or into the water. Removable tank You can refuel on the shore, in a calm environment, or use stationary gas stations on the pier, which is much faster and cleaner.
- 🚀 Increase in range of swimming by 5-10 times compared to the standard capacity.
- 🛡️ Reduce the risk of fire by removing fuel from heat sources.
- ⚖️ The ability to optimize the centering of the boat by placing the cargo.
- 🔧 Simplification of the procedure of fueling and control of the level of fuel.
Design features and materials of manufacture
The market today offers two main types of fuel tank materials: plastic and metal, each with different operating specifications that must be considered when choosing. Plastic tanksThey are typically made of high-density polyethylene with the addition of ultraviolet stabilizers, lightweight, non-corrosion-prone, and often have translucent walls, allowing visual control of the fuel balance.
Metal containers, most often made of aluminum or stainless steel, are very durable and durable. However, they are susceptible to corrosion when improperly treated or contacted with salt water. Inside metal tanks, you can often find a coating that prevents oxidation, but even this does not guarantee eternal service. Aluminum tanks lighter than steel, but require careful handling, since when hitting the side or stone, they can deform, which will violate the tightness.
The most important element of the design is the fuel intake, which in quality models is equipped with a filter-sludge filter, which traps water and large debris without letting them into the mainline. return-valve, preventing the leakage of fuel when the hose is disconnected, and a ventilation valve that provides normal pressure inside the tank during fuel generation.
When buying a plastic tank, look for the labeling of the material. Look for HDPE (high-density polyethylene) designations indicating compatibility with gasoline and ethanol (E10, E15), since ordinary plastic can be destroyed by alcohol additives in modern fuels.
And the form factor is also a form factor, and the tank is rectangular, which is convenient for mounting in a rundoo or under a seat, and cylindrical, which is easier to attach to a transom or a side, and the choice of shape is dictated by the architecture of your boat and the availability of space.
Calculation of required volume and range
Before you go to the store, you have to do some simple math to figure out how much you want. fuel It's usually specified in terms of liters per hour (l/h) at full power, but in practice, motors rarely run at 100 percent, so the actual consumption is often 60 to 70 percent of the passport value.
For the calculation, use the formula: Operating time = tank volume / Fuel consumptionFor example, if the engine consumes 5 l/h and the tank holds 24 liters, then theoretically it will last 4.8 hours. stock-stock (usually 20–25%) in case of unforeseen circumstances: strong headwinds, currents or the need for emergency maneuvers.
| Engine power (hp) | Average consumption (L/h) | Tank volume 12 l (hours) | Tank volume 24 l (hours) | Tank capacity 60 l (hours) |
|---|---|---|---|---|
| 2.5 – 3.5 | 1.0 – 1.5 | 8-12 hours. | 16-24 hours. | 40-60 hours. |
| 5 – 6 | 1.5 – 2.2 | 5-8 a.m. | 10 to 16 hours. | 27-40 a.m. |
| 8 – 10 | 2.5 – 3.5 | 3-5 hours. | 7-10 a.m. | 17-24 hours. |
| 15 – 20 | 4.0 – 6.0 | 2 to 3 hours. | 4-6 hours. | 10-15 hours. |
When planning long expeditions, it is worth considering installing multiple tanks or using large containers (100+ liters), but this is where the weight and dimensions restrictions come into force. Fuel systems with a total volume of more than 200 liters on small craft often require coordination with the registering authorities and additional fire alarms.
Also, consider that a full tank weighing 24 liters will add about 17-18 kg (including the weight of the container itself). For light inflatable boats, this is a significant load that can affect load capacity and speed. So the balance between autonomy and weight must be found individually for each boat owner.
Choice of fuel hose and paging pear
The fuel hose is the link between the tank and the engine, which is a simple part, but it is the one that causes problems most often. Standard hoses, which come with the engine, are often 2-3 meters long, which is inconvenient when installing the tank in the bow of the boat. Purchasing an elongated hose (6, 9 or 12 meters) solves the problem, but requires attention to the quality of the material.
Modern ethanol fuels are aggressively affecting rubber and certain plastics. USCG Type A1 Or similar, confirming its resistance to alcohol and the ability to keep vapors out, using cheap analogues without adequate protection can lead to swelling of the hose, cracks and, as a result, fuel leakage.
Why does the paging pear harden?
A common cause of rubber pear fossilization is long-term storage of the fuel tank when the pear is compressed or under pressure, and the destruction is caused by low-quality gasoline with a high content of aggressive additives. Keep the pear in straightened form and outside direct sunlight.
The second important element is itself puncture-pear It's used to generate initial pressure in the system and visually control the fuel supply, and if the engine is soft and doesn't fill, it's a signal that the filter is clogged or the fuel pump is malfunctioning, and if it blows up like a ball, the flipper or the fine cleaning filter is clogged.
- 🔍 Check the hose for cracks and scuffs before each season.
- 🔄 Change the fuel hose every 3-5 years, even if it looks whole (resurfaced).
- 🛢️ Make sure that the diameter of the hose (usually 8 mm) corresponds to the connections of the tank and motor.
- 💡 Use quick-removal connections with valves for ease of disconnection.
⚠️ Warning: Never use conventional garden hoses or water supply hoses for fuel, and the gasoline will quickly dissolve their internal structure and the pieces of rubber will get into the carburetor, leading to costly repairs.
Rules for safe installation and installation
The right installation of the remote tank is the key to your safety, the main rule: the tank must be securely fixed. In conditions of pitching, sharp turns or hitting a wave, an unfixed 24-liter container turns into a dangerous bar weighing almost 20 kg, which can injure passengers or damage the board.
Use special brackets, belts with quick-removal carabiners or regular niches in the boat design. If the boat is metal or with a rigid bottom, you can make a stationary box-block with ventilation. In inflatable boats, PVC tank is usually installed on the slate (floor) in the bow or under the front seat, fixing it with slings.
☑️ Checking the correctness of the tank installation
Pay special attention to the hose laying. It should not lie in water, be clamped by sides or seats, and touch the exhaust pipe or other hot elements of the engine, the optimal option is to run the hose through special hatches or along the side, fixing it with clips. Fuel line shall have smooth curves, the radius of which is not less than the minimum permissible for this type of hose.
When installing a tank in a closed compartment (for example, in a hazel), it is mandatory to organize supply and exhaust ventilation. The holes should be located at the lower and upper points of the compartment, since gasoline vapors are heavier than air and will accumulate at the bottom. The lack of ventilation in a closed volume with the tank is unacceptable.
Maintenance and typical faults
Even the most reliable system requires regular maintenance, and the main enemy of the fuel system is water and condensate, and water can enter the tank with fuel at the gas station or form inside due to temperature changes (condensation), because water is heavier than gasoline, it settles to the bottom.
To remove water, use a sump, if it is provided by the design of the tank, or special fuel filter-separators, installed additionally in front of the engine. fuel-filter (carburetor or injector) – a mandatory procedure, especially after prolonged downtime or refueling on suspicious columns.
Typical malfunctions and their signs:
- 📉 The engine is stalling at high speeds: Most likely, the filter is clogged or the hose flattened and blocked the flow in high vacuum.
- 💨 The engine is not running smoothly: It is possible that air entered the system through an unsealed connection or a crack in the hose.
- 🛑 The pear is not filled: The return valve in the tank is faulty or the fuel intake is clogged.
Regular replacement of fuel filters and the use of high-quality additives-stabilizers of fuel prolong the life of the carburetor and fuel pump for years, saving money on repairs.
When you can preserve a boat for winter storage, it is recommended to develop fuel from the tank and hoses completely or use a fuel stabilizer if the tank is planned to be left full. A full tank reduces the area of oxidation of the walls and condensation, but only if the fuel is treated with chemistry.
Frequently Asked Questions (FAQ)
Can I use a remote tank with any outboard motor?
Yes, the retractable tank can be connected to almost any two-stroke or four-stroke motor that has a connection for an external fuel line. Older models that do not have a fuel pump may require a tank above the level of the carburetor for the slope or the use of an additional pumping pear with a valve.
How often should you change the fuel hose and pear?
The life of a good hose is about 5 years, but visual inspection is necessary every season. If the hose has become rigid, sticky or covered with a network of small cracks, it must be changed immediately.
Is a plastic tank dangerous in the cold?
Specialty marine plastics (HDPEs) retain their properties at low temperatures, but in extreme cold (below -20°C), plastic can become more fragile, metal tanks are more reliable, but require corrosion protection, the main thing is not to drop a frozen plastic tank.
Do you need a separate filter if you have it in the tank and in the engine?
Installing an additional fuel filter separator between the tank and the engine is a great practice, especially for injection engines, creating an additional barrier to water and dirt, protecting the engine’s expensive fuel equipment.
Can I keep a full tank of gasoline in my garage?
Storing a full tank of gasoline in a residential or non-specialized garage is prohibited by fire safety regulations. Gasoline vapors are explosive. You can only store a tank of fuel in specially equipped metal cabinets with ventilation or in detached buildings.