Rajan Wilcox
The choice between a metal or plastic outboard fuel tank depends on several factors, including durability, cost, maintenance, and compatibility with fuel type. Metal tanks, such as those made from aluminum, are known for their strength and durability, but they may be more susceptible to rust and corrosion, especially with the introduction of ethanol in gasoline. On the other hand, plastic tanks are lightweight, incredibly durable, and less likely to leak or corrode, but they may be more prone to swelling in hot temperatures and can release fuel vapors over time. Both types of tanks have their advantages and disadvantages, and the best choice depends on specific needs and preferences.
| Characteristics | Values |
|---|---|
| Durability | Plastic tanks are considered "incredibly durable" and more reliable than aluminium tanks for gasoline. |
| Strength | Plastic tanks are not as strong as steel and can be punctured or ripped. |
| Rust | Metal tanks can rust, which can contaminate the fuel. |
| Weight | Plastic tanks are lighter than metal tanks. |
| Fuel line issues | Plastic tanks can leak more easily than metal tanks. |
| Expansion | Plastic tanks expand and contract with heat, which can cause issues over time. |
| Cost | Metal tanks are cheaper than plastic tanks. |
| Ethanol | Ethanol may cause issues with aluminium tanks. |
| Fire resistance | Both plastic and metal tanks meet USCG requirements for fire resistance. |
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What You'll Learn
Plastic tanks are more durable and reliable than metal tanks
Plastic tanks are also more durable than metal tanks. They are less prone to fractures, especially in below-deck fuel tanks, due to their ability to withstand sun damage. Plastic tanks are also not affected by galvanic reactions caused by ethanol, which can lead to corrosion and welded seam issues in metal tanks.
The introduction of ethanol has shifted the preference for marine fuel tanks from aluminum to plastic. Plastic tanks are technically superior when it comes to ethanol compatibility, and their seams are stronger than those of aluminum tanks. Plastic tanks also meet USCG fire resistance requirements and have improved over time to reduce vapor permeation, addressing previous concerns about fuel odour.
Plastic tanks offer a more reliable option for gasoline storage. They are less likely to introduce galvanic action to other components on the boat and do not require the same level of maintenance as metal tanks. Plastic tanks are also relatively inexpensive and widely available, making them a cost-effective and convenient choice for boat owners.
Overall, plastic tanks offer superior durability and reliability compared to metal tanks, especially when considering the challenges posed by ethanol and the need for fuel tanks that can withstand the marine environment without introducing contaminants or requiring excessive maintenance.
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Metal tanks are more expensive than plastic tanks
The higher cost of metal tanks can be attributed to the material's strength and durability. Metal tanks, such as those made of steel or aluminum, are stronger and more durable than plastic tanks. They can withstand shocks and impacts without puncturing or tearing, making them a safer option for fuel storage.
However, it is worth noting that the introduction of ethanol has shifted some preferences towards plastic tanks. Ethanol can cause galvanic reactions in aluminum tanks, leading to corrosion and potential engine troubles. Plastic tanks, on the other hand, are not affected by ethanol and are considered "incredibly durable" by many experts.
Additionally, plastic tanks have some advantages over metal tanks. They are lighter in weight, making them easier to carry and transport. Plastic tanks also do not rust, eliminating the possibility of rust stains on the deck or fuel contamination.
While metal tanks have a higher upfront cost, they can last for up to 25-30 years with proper maintenance. On the other hand, plastic tanks may require more frequent replacements due to leakage or other issues. Therefore, while metal tanks are more expensive initially, they may prove to be a more cost-effective option in the long run, depending on the specific use case and maintenance practices.
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Metal tanks are heavier than plastic tanks
Plastic tanks, on the other hand, are known for their lightweight construction. They are much easier to handle and transport due to their reduced weight. This weight advantage is a significant consideration for boat owners who may need to carry or lift the tanks during installation, maintenance, or refuelling. The lightweight nature of plastic tanks also contributes to the overall weight of the boat, potentially improving speed, fuel efficiency, and handling characteristics.
While metal tanks offer superior strength and impact resistance, their weight can be a drawback in terms of convenience and manoeuvrability. Plastic tanks, despite being less robust, provide the advantage of lightweight construction, making them easier to manage during various boat operations. This weight difference can influence the decision-making process when choosing between metal and plastic outboard fuel tanks.
It is worth noting that the weight of metal tanks can be a safety concern for some boat owners. Heavier tanks may require more secure mounting and stabilisation to prevent shifting or movement during boat operation. Additionally, the weight of metal tanks can impact the overall weight and performance of the boat, especially in high-speed or racing applications.
In summary, metal tanks are heavier than plastic tanks, and this weight difference can influence purchasing decisions. While metal tanks offer durability and impact resistance, plastic tanks provide the advantage of lightweight construction, ease of handling, and improved boat performance. Boat owners need to consider the trade-offs between durability and weight when deciding between metal and plastic outboard fuel tanks.
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Metal tanks are more prone to rusting than plastic tanks
Metal fuel tanks are more susceptible to rusting than plastic tanks. This is because plastic is a non-metallic composite that does not rust. Metal tanks, on the other hand, can develop rust when water gets into them and stays there for prolonged periods. While it is possible to coat metal tanks with a rust inhibitor or tank sealer, this may not entirely prevent rusting over time. Additionally, metal tanks may require more maintenance to prevent corrosion, especially if they come into contact with other metals or alloys that are not the same as the tank material.
Plastic tanks are often considered more durable and reliable than metal tanks for gasoline storage. They are less likely to leak and are not affected by ethanol, which can be an issue for metal tanks. Plastic tanks also have stronger seams than aluminum, making them more resistant to fractures from constant pressure and jarring.
One disadvantage of plastic tanks is their tendency to expand and contract with heat. This can cause the plastic to stretch and weaken over time. However, some users have reported that this expansion can also help to break loose residue stuck to the sides of the tank, preventing it from running through the fuel system. Additionally, plastic tanks are generally lighter and easier to carry than metal tanks, reducing the risk of injury.
While metal tanks may be more prone to rusting and corrosion, they have their own advantages. Metal, such as aluminum, is often considered stronger and more durable than plastic. Metal tanks can withstand shocks and impacts that could puncture or damage a plastic tank. Metal tanks are also generally cheaper than plastic tanks of similar sizes.
Overall, both metal and plastic fuel tanks have their advantages and disadvantages. Metal tanks may be more prone to rusting, but they offer superior strength and durability. Plastic tanks are less likely to rust and are more flexible, but they may be more susceptible to heat-related issues and physical damage. The choice between a metal or plastic outboard fuel tank ultimately depends on the specific needs and preferences of the user.
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Metal tanks are stronger than plastic tanks
While metal tanks can rust, this can be prevented with a good coating of tank sealer. Metal tanks are also cheaper to produce and can be more durable, lasting up to 25 years or more with proper maintenance.
Some users have noted that they prefer plastic tanks as they are lighter and have no issues with fuel line pressure or water or other contaminants. Plastic tanks are also preferred by some for their transparency, which allows users to see the fuel level, and they do not rust, which can prevent stains and contamination of the fuel.
However, some plastic tanks have issues with leaking fittings, and the plastic tanks that meet US EPA standards do not permeate vapors, so smell is no longer an issue.
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Frequently asked questions
Metal fuel tanks are stronger and more durable than plastic tanks. Metal tanks are also less likely to leak and are not affected by changes in temperature.
Metal tanks are more expensive than plastic tanks. They are also heavier, which could be an issue when transporting the tank. Metal tanks are also more likely to rust, which could contaminate the fuel and cause engine issues.
Plastic tanks are cheaper, lighter, and more durable than metal tanks. They are also less likely to rust, which means there is no risk of fuel contamination. Plastic tanks are also easier to transport and store due to their flexibility and lower weight.
Plastic tanks are more likely to leak and can be affected by changes in temperature, causing them to expand and contract. Plastic tanks may also be less safe in the event of a fire.
