Ameer Randolph
Chinese diesel heaters are a cost-effective way to heat enclosed spaces. They are often used for camping or in vehicles. The stock items that come with these heaters can sometimes be substandard, especially the green fuel line, which tends to fail over time. The fuel line size varies depending on the specific heater model and the section of the fuel system being referenced. For example, the internal diameter of the fuel line for the Hcalory heater is 0.16, while the fuel pump and heater fuel intake are 3/16. The connecting hoses for the diesel heater repair kit have an inner diameter of 4mm and an outer diameter of 10mm. It is important to use a fuel line that is rated for diesel and can withstand the pressure involved.
Chinese Diesel Heater Fuel Line Characteristics and Values
| Characteristics | Values |
|---|---|
| Hose Length | 16.4 ft |
| Hose Outer Diameter | 5mm |
| Hose Inner Diameter | 3mm, 4mm, 5mm, 3/16" |
| Hose Material | Plastic, Rubber, Nylon |
| Hose Colour | Green |
| Hose Wall Thickness | 0.8mm, 3.5mm |
| Hose Pressure Rating | USCG A1 |
| Hose Marine Rating | USCG A1 |
| Filter Height | 3.15" |
| Filter Outer Diameter | 1.3" |
| Filter Inner Diameter | 0.98" |
| Connecting Hose Length | 1.96" |
| Connecting Hose Outer Diameter | 10mm |
| Connecting Hose Inner Diameter | 4mm |
| Hose Clamp Size | 9-11mm |
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What You'll Learn
Hose sizes and ratings can be misleading
When selecting a hose for a Chinese diesel heater, it is important to consider the inner diameter (ID) of the hose. The ID of the hose plays a crucial role in ensuring the proper metering of fuel to the heater. It is recommended to match the ID of the hose to the specifications provided by the heater manufacturer. For example, some heaters may require a 5 mm hose, while others may specify a 4 mm hose.
However, hose sizes and ratings can be misleading. In some cases, a thin-walled hose may have a higher rating than a thicker-walled hose due to the presence of a reinforcing braid within the hose. Therefore, it is important to not only consider the size of the hose but also its rating and the materials used in its construction. The hose should be rated for the specific fluid it will be carrying, in this case, diesel fuel, and it should also be rated for the appropriate pressure.
Additionally, there are different standards and ratings for hoses, such as the marine rating USCG A1, which is recommended for fuel hoses in marine applications. When selecting a hose, it is important to ensure that it meets the relevant standards and ratings for your specific use case. It is also helpful to choose a hose with markings or embossing on the side for easy identification.
The outer diameter (OD) of the hose is also a factor to consider. While the ID ensures proper fuel metering, the OD can impact the hose's compatibility with connectors and fittings. It is important to measure the actual size required for your specific application and select a hose with the appropriate OD to ensure a secure and proper fit.
Lastly, it is worth mentioning that some diesel heaters may come with stock parts that are considered substandard or inadequate. For example, the fuel line may be too thin or the hose clamps may be weak. Upgrading to a more substantial fuel line and higher-quality hose clamps can improve the performance and reliability of the heater.
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Hose material type
When it comes to the hose material type for a diesel heater, there are a few options to consider. The most common materials used for fuel lines in diesel heaters include rubber, plastic, and galvanized steel.
Rubber hoses are flexible and durable, making them a popular choice for fuel lines. They can withstand high temperatures and are suitable for carrying diesel fuel. It is important to ensure that the rubber hose is rated for diesel fuel and can handle the pressure involved. The inner diameter (ID) of the hose should be appropriate for the size of the fuel line, typically ranging from 3mm to 5mm, while the outer diameter (OD) can vary. For example, a 5/32" (4mm) ID rubber hose may have an OD of 6.4mm, resulting in a thin wall thickness. Thicker-walled hoses, such as those with a 3.5mm ID and 9.5mm OD, are also available and may offer higher pressure ratings.
Plastic hoses are another option and are often used in diesel heater kits. While they may not have the same flexibility as rubber hoses, they can still effectively carry diesel fuel. It is important to ensure that the plastic hose is compatible with the diesel heater and meets the required standards.
Galvanized steel is also used for fuel lines, offering durability and corrosion resistance. Galvanized steel furnace ducts and dryer hoses can be purchased from hardware stores and used for diesel heaters. These metal hoses ensure zero fumes and are suitable for both heater intake and exhaust. However, they may not pack up well and can be prone to tearing over time.
When selecting a hose material type, it is crucial to consider the specific requirements of your diesel heater, including the size of the fuel line, the operating temperatures, and the pressure ratings. Additionally, markings or embossing on the hose can help identify its specifications and ensure compatibility with diesel fuel.
Some diesel heater kits offer a combination of hose materials, such as rubber connecting hoses and plastic fuel hoses, along with galvanized steel hose clamps. These kits aim to provide a comprehensive solution by addressing the shortcomings of stock items, offering more substantial lines, improved hose clamps, and sturdier fuel filters.
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Hose length
The hose length and size for a Chinese diesel heater vary depending on the specific model and application. Some common hose lengths and sizes recommended for Chinese diesel heaters are as follows:
- 16.4 Ft Hose Length: This is a common hose length included in diesel heater fuel line kits. It provides sufficient length for connecting the fuel source to the dosing pump and for short joining pieces from the pump to the heater.
- 8" of Hard Plastic Hose: This length is recommended for the output side of the pump, providing flexibility and ease of routing.
- Combustion Air Intake Hose: The length of this hose should be considered, as it may need to be longer depending on the location of the combustion air intake.
- Fuel Pump Wires: While not directly related to fuel line length, it is important to ensure that the wires for the fuel pump controller are of sufficient length to be routed and mounted conveniently.
Hose Size Recommendations:
- 2mm ID/4mm OD Hard Plastic Line: This is the standard size that comes with many Chinese diesel heaters and is recommended for the connection between the dosing pump and the heater.
- 1/4" Fuel Line: A high-quality 1/4" fuel line can be used to provide flexibility and ease of routing, especially when connecting to the pump.
- 3/16" Rubber Fuel Line: This size is commonly used to connect the fuel line to the filter, pump, and heater, providing a secure and tight fit.
- 5/32" (4mm) ID Rubber Hose: This size is recommended for the connection from the fuel source to the dosing pump and for short joining pieces.
It is important to note that the specific hose length and size requirements may vary depending on the make and model of the Chinese diesel heater. Always refer to the manufacturer's instructions or consult a professional for guidance on selecting the appropriate hose length and size for your specific application.
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Hose thickness
The hose thickness for a Chinese diesel heater is an important consideration, and there are a few options available depending on the specific application and requirements.
Firstly, it is important to note that the fuel line internal diameter for a Chinese diesel heater is typically around 0.16" or 3/16" (approximately 5mm), as mentioned in some sources. This is the standard size for the fuel pump and heater fuel intake, and it is important to ensure that the hose thickness allows for a secure and proper connection to these components.
In terms of specific hose thickness options, one common recommendation is to use a 4mm rubber hose with a 5mm hard nylon tube for the fuel line. This combination provides a balance between flexibility and robustness, as the 4mm rubber hose can be easily routed, while the hard nylon tube offers durability. It is worth noting that the hard nylon tube is recommended over the green fuel line that often comes with Chinese diesel heaters, as the green line has been known to fail and soften with diesel fuel.
Another option mentioned is a 2mm hard fuel line, which is the standard size that comes with some heaters and is recommended for use between the pump and the heater. This smaller size may be more suitable for metering fuel in small bursts under pressure, but it might be more challenging to find connectors that accommodate this size.
It is also important to consider the pressure and fluid ratings of the hose. The hose should be rated for diesel fuel and the specific pressure requirements of the application. Additionally, there is a marine rating for fuel hose, known as USCG A1, which may be worth considering for added peace of mind.
Lastly, it is worth mentioning that hose sizes and ratings can sometimes be deceiving. In some cases, a thin-wall hose may have a higher rating than a thicker-wall hose due to the reinforcing braid within. Therefore, it is crucial to carefully review the specifications and ratings of the hose before making a purchase decision.
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Hose connections
The fuel line internal diameter is typically 0.16" or 3/16", while the fuel pump and heater fuel intake are often 3/16". This measurement is crucial for ensuring the correct flow rate and compatibility with the heater's fuel system.
For Chinese diesel heaters, it is recommended to use a 4mm rubber hose with a 5mm hard nylon tube. This combination provides flexibility and durability, allowing for easier routing and installation. The hard nylon tube offers improved resistance to diesel fuel when compared to the standard green fuel line, which has been reported to soften and fail prematurely.
When sourcing hoses, it is important to consider the ratings and markings on the hose. Hoses should be rated for the specific fluid they will carry, in this case, diesel fuel, and they should also meet the required pressure ratings. The USCG A1 marine rating is often used as a standard for fuel hoses in marine applications.
In addition to the hose size and type, it is worth noting that the quality of the fuel line clamps is important. Upgrading to quality 9-11mm mini-fuel injector clamps can enhance the overall performance and reliability of the fuel system.
When purchasing a Chinese diesel heater or replacement parts, it is advisable to double-check the OEM/size/heater model number to ensure compatibility and meet your specific requirements.
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Frequently asked questions
The standard size for a Chinese diesel heater is a 2mm hard fuel line, which is recommended from the pump to the heater. The internal diameter of the fuel line is 0.16" (~3/16"), while the fuel pump and heater fuel intake are 3/16".
It is recommended to use a hard nylon type fuel line for Chinese diesel heaters. The green fuel line that often comes with the heater will likely fail as it will soften with diesel.
The heater usually comes with a tiny 2mm internal diameter and 4mm outer diameter hard plastic line.
The connecting hose length is usually 1.96" with an outer diameter of 10mm and an inner diameter of 4mm.
The standard fuel filter has a height of 3.15", an outer diameter of 1.3", and an inner diameter of 0.98".
