Sylvie Willis
The DRZ400SM is a motorcycle model that has been associated with fuel overflowing problems. Users have reported finding puddles of fuel under the bike after filling the tank, which may be due to a faulty float valve or a bad petcock. Some have suggested that the issue could be related to the bike's vent cap or needle valve, which may not be functioning properly and causing a build-up of pressure in the tank. It is worth noting that there are two types of DRZ tanks: one that is California/EU compliant and one that is not. California environmental laws prohibit fuel tanks from venting to the atmosphere, which may be a factor in the overflowing fuel issue for some DRZ400SM owners.
| Characteristics | Values |
|---|---|
| Reason for "no CA" on DRZ fuel tank | California environmental laws don't allow tanks to vent to the atmosphere |
| Other reasons for fuel overflowing | Float valve malfunction, bad petcock, or a full tank with a non-working vent cap |
| Fuel tank material | Metal for street-oriented or capable of street riding motorcycles; plastic for off-road versions |
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What You'll Learn
California-compliant tanks
California-compliant fuel tanks adhere to the state's strict environmental laws, which prohibit tanks from venting to the atmosphere. This means that the tanks are designed to prevent fuel vapours from escaping into the air, reducing emissions and pollution.
The California Air Resources Board (CARB) sets standards for fuel tanks and other automotive components to ensure that they meet the state's environmental and air quality standards. One of the key requirements for California-compliant fuel tanks is that they have a sealed vapour recovery system. This system captures fuel vapours and redirects them back into the fuel tank or engine to be burned rather than released into the atmosphere.
The specific design of California-compliant fuel tanks can vary, but they typically include features such as:
- A vapour recovery line that connects to the fuel tank or engine
- A charcoal canister that absorbs and stores fuel vapours
- A vent valve that regulates the flow of vapours and prevents them from escaping
- A sealed cap or lid to prevent vapours from escaping from the tank
It is important to note that the California-compliant fuel tanks are not just for motorcycles but also for other vehicles and equipment. For example, landscapers use CARB-compliant gas cans for their equipment.
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The float valve
One common problem with the float valve is that it can become stuck in the open position, allowing fuel to continue flowing into the carburettor even after it is full. This can result in fuel overflowing and leaking onto the ground or into other components of the motorcycle, such as the engine and oil. It is important to address this issue promptly to prevent damage to the motorcycle and potential safety hazards.
To troubleshoot float valve issues, it is recommended to verify that lifting the float cuts off the fuel flow. If the float valve needle has failed, it may need to be replaced. Regular maintenance and inspection of the float valve can help prevent these issues and ensure the proper functioning of the fuel system.
It is worth noting that the DRZ400 has different fuel tank designs, including one that is compliant with California environmental laws. These regulations prohibit fuel tanks from venting to the atmosphere, which can impact the function of the float valve and fuel system. When addressing fuel tank and float valve issues, it is important to consider the specific model and any applicable environmental regulations.
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The petcock
On some motorcycles, such as the DRZ400, the petcock is connected to a vent line or vacuum line that helps to equalize pressure in the fuel tank. This vent line is designed to allow air to flow in and out of the tank, preventing a build-up of pressure that could force fuel past the needle valve and cause leaks.
It is important to note that the petcock should always be turned off when the motorcycle is not in use, as leaving it on can lead to fuel leaks and overflows. Additionally, if the petcock is not functioning properly, it can cause fuel to leak past the needle valve and onto the garage floor, as well as into the engine cylinder and oil. Therefore, it is crucial to regularly inspect and maintain the petcock to ensure it is working correctly.
In terms of fuel tank construction, there are different regulations for street-oriented motorcycles and off-road motorcycles. For example, in California, environmental laws do not allow fuel tanks to vent to the atmosphere, which has an impact on the design of the petcock and venting system. Additionally, street-oriented motorcycles in the United States are typically required to have metal fuel tanks, while off-road motorcycles can have plastic fuel tanks.
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Vent cap issues
The DRZ400SM is prone to overflowing fuel. This can be caused by a faulty vent cap on the tank, which can lead to a build-up of pressure that forces fuel past the needle valve. A malfunctioning vent cap can also cause fuel to leak onto the garage floor and into the engine cylinder.
There are two types of DRZ tanks: one that is California/EU-compliant and one that is not. California environmental laws do not allow fuel tanks to vent to the atmosphere. Instead, compliant tanks have a vent line that allows air to enter the fuel tank as fuel flows out, preventing a vacuum from forming.
A clogged fuel cap vent can cause the bike to surge at a constant RPM. This can be fixed by clearing the vent with a clean hose and blowing into it (not with an air compressor). Another method is to clean the inside of the fuel cap with carburettor cleaner.
If the vent is functioning properly, the issue may be caused by a faulty float valve in the carburettor, which can stick and fail to shut off fuel flow when the carburettor is full. The float valve may also be set too high, causing the carburettor to overflow.
It is recommended to check the oil if fuel is leaking from the vent cap, as it may be contaminated with excess fuel. If the oil is overfull or smells like gasoline, it should be flushed.
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Metal vs. plastic tanks
The acronym "CA" in "no CA" on a DRZ fuel tank stands for California, which has specific environmental laws that do not allow fuel tanks to vent to the atmosphere. This means that the fuel tank is not compliant with California's environmental laws.
Now, when it comes to metal vs. plastic tanks, there are several factors to consider:
Durability
Metal tanks are incredibly strong and durable. They can withstand harsh weather conditions, external damage, and extreme temperatures. Metal tanks are also more resistant to fire and explosions, making them ideal for industrial settings. Plastic tanks, on the other hand, are more prone to damage from external factors, including UV exposure and harsh weather conditions. They may melt and leak fuel when exposed to fire.
Weight and Flexibility
Plastic tanks are lightweight, making them easier to transport and install. They are also more flexible and can be customized to fit into specific spots, which is important given the complexity of a vehicle's undercarriage. Metal tanks, due to their weight, may impact fuel economy negatively.
Maintenance
Both types of tanks require regular maintenance. Metal tanks require regular cleaning and painting to prevent corrosion and rust. Plastic tanks, while less prone to leaks, only need cleaning to remove debris and sediment.
Cost
Plastic tanks are generally more affordable than metal tanks due to the lower cost of the material and the ease of production. However, metal tanks may be more cost-effective in the long run due to their longer lifespan.
Environmental Impact
Metal tanks are more difficult to recycle and can have a larger carbon footprint. Plastic tanks are more environmentally friendly as they are recyclable and lightweight, reducing fuel consumption during transportation. However, regulations in certain areas may prohibit the use of plastic tanks for specific types of fuel, such as diesel.
In conclusion, the choice between a metal and a plastic tank depends on specific needs, budgets, and applicable regulations. Each type of tank has its own advantages and drawbacks, and careful consideration of these factors is necessary to make an informed decision.
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Frequently asked questions
"No CA" on a DRZ fuel tank likely refers to a tank that is not California/EU compliant. California environmental laws do not allow fuel tanks to vent to the atmosphere.
A California/EU-compliant DRZ fuel tank has a vent line that allows air to flow in and out of the tank to equalize pressure. This vent line is connected to the vacuum line.
The vent line on a DRZ fuel tank is designed to prevent fuel overflow by equalizing pressure in the tank. However, due to California environmental laws prohibiting fuel tanks from venting to the atmosphere, some DRZ fuel tanks are designed without this feature.
