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The best diesel heater fuel line depends on the heater model, required hose dimensions, and whether you need a complete replacement kit or extra parts for maintenance. The 5-meter Webasto and Eberspacher kit is a practical match when its stated dimensions suit your setup; the 16.4-foot kit is more suitable when listed OEM numbers and heater models match. The two-set kit offers more spare components, while the silicone hose kit is an option for buyers seeking that material. Check fitment before ordering.

5M Fuel Tank Hose Clip Inline Filter Kit

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This kit is best for buyers who need a replacement fuel line and several connection parts for a compatible Eberspacher or Webasto heater. It is selected for its stated 5-meter line length, included inline filter, connection hoses, and hose clips. The product description says the kit fits those heater brands and can be fitted into an existing vehicle fuel tank or tank sender unit.

• Includes one 5-meter fuel line, five connection hoses, ten hose clips, and one diesel fuel filter.
• Fuel pipe dimensions are listed as 2.6 mm inner diameter and 5 mm outer diameter.
• The description also lists rubber tube dimensions and a filter length of 77 mm.

Choose this option if its measured line dimensions and included parts match the original setup. A limitation is that the listed fuel-line inner diameter differs from the 3 mm inner diameter specified for the 16.4-foot kit, so the two should not be treated as interchangeable without checking the heater requirements.

4M Flexible Silicone Fuel Line Kit

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This kit is best for buyers specifically looking for a silicone fuel-line option for a compatible Webasto or Eberspacher air diesel parking heater. It is included because the seller describes it as a replacement kit for restoring old or damaged fuel supply lines, and it includes a filter and connection hardware rather than just a length of hose.

• Includes one 4-meter main hose, five black connection hoses, ten stainless steel clamps, and one filter.
• The main hose is described as high-grade green silicone.
• The listing says the hose is designed for compatible Webasto and Eberspacher air diesel parking heaters.

Choose this kit if you want silicone construction and the stated 4-meter length suits your routing needs. The product information does not give hose inner or outer diameter, so verify the required dimensions before purchase. Do not assume that a material description alone confirms fitment for every diesel heater or fuel-line arrangement.

16.4Ft Diesel Heater Fuel Line Kit

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This kit is best for buyers whose heater and replacement part number match the listing. It is selected for its detailed compatibility list and clearly stated hose dimensions. The seller identifies OEM replacement numbers 1320399A and 35320A and names multiple Eberspacher and Webasto heater models. The listing advises checking both the part number and heater model before ordering.

• Includes a 16.4-foot fuel hose, inline filter, connecting hoses, and fuel-line clamps.
• Fuel hose dimensions are listed as 5 mm outer diameter and 3 mm inner diameter.
• The listing names models including HL18/24/32, HL90, DBW46, Thermo Top C/E, and Thermo 50/90/90ST.

Choose this option when the listed OEM number, heater model, and dimensions align with your existing installation. Its main limitation is that compatibility is not universal: the seller explicitly asks buyers to double-check fitment, and the dimensions differ from those of the first 5-meter kit.

Two-Set 5m Fuel Line Kit

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This two-set package is best for buyers who want replacement parts and a second set of components to keep as spares. It is selected for the quantity included: two long fuel lines, two filters, 24 pipe clamps, and 12 connecting hoses. That larger parts count may suit maintenance planning where having extra line and fittings available is useful.

• Provides two 5-meter fuel lines and two fuel filters.
• Includes 24 pipe clamps and 12 black pipe connecting hoses.
• The listing describes the components as plastic and metal and says the kit is compatible with most types of heater tanks.

Choose this kit if you have confirmed that the parts match your heater and want a spare set on hand. The limitation is that the compatibility description is broad and does not specify hose inner or outer diameter or name particular heater models. Confirm the dimensions and fitting style before relying on the general compatibility statement.

5M Fuel Tank Hose Clip Kit

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This kit is best for buyers looking for a fuel tank standpipe-style replacement associated with Eberspacher or Webasto heaters. It is selected because the listing names both heater brands and gives replacement numbers 1320399A and 35320A. The seller describes the components as made from rubber and metal and states that the kit has passed a waterproof test.

• Listed for Eberspacher and Webasto heater fuel tank applications.
• Replacement numbers are 1320399A and 35320A.
• Described materials include rubber and metal.

Choose this product if the standpipe arrangement and replacement number match your heater setup. The product details provided do not specify the hose length, diameter, filter contents, or the full parts count. That makes it important to compare the complete package contents and measurements with your current installation before ordering.

Buying Guide: How To Choose A Diesel Heater Fuel Line

Which hose length do you need?

Measure the route from the fuel source to the heater and allow for the actual path the line must follow. The products here list line lengths of 4 meters, 5 meters, or 16.4 feet. A longer hose is not automatically a better fit: extra length may not solve a mismatch in diameter, fittings, or fuel-source connection. Check the listed length against the route in your vehicle, RV, or other installation.

Which inner and outer diameter should you compare?

Use the dimensions specified for your heater or the measurements of the original line as a reference. Inner diameter affects how the hose connects to the fuel system, while outer diameter can matter for clips and connections. Among these options, one kit lists a 2.6 mm inner diameter and 5 mm outer diameter; another lists a 3 mm inner diameter and 5 mm outer diameter. These small differences matter when selecting replacement parts.

Do you need a complete kit or only the hose?

A complete kit can reduce the need to source individual filters, connecting hoses, and clamps. Compare the package list before buying: the first kit includes a filter, five connection hoses, and ten clips, while the silicone kit includes a filter, five connection hoses, and ten stainless steel clamps. The two-set option includes extra quantities of lines, filters, clamps, and connectors. Do not assume that every kit contains the same fittings or filter dimensions.

How should you check heater compatibility?

Start with the heater manufacturer and model, then check any replacement number shown for the original part. The 16.4-foot kit names several models and replacement numbers 1320399A and 35320A. Two other listings also refer to those replacement numbers, but this does not establish that every part in those kits fits every listed heater. Compare the product details with your heater documentation and existing components before purchase.

Is silicone or rubber the better choice?

Material choice should be based on the heater maker’s requirements and the specifications of the existing installation. The 4-meter kit is described as silicone, while other product descriptions refer to rubber or do not identify the main fuel-line material clearly. The silicone listing makes claims about resistance to cracking, hardening, and heat, but it does not provide hose dimensions. Confirm both material suitability and sizing rather than choosing on material name alone.

When is a standpipe kit appropriate?

A standpipe-style kit may be relevant when the replacement involves the fuel tank connection, not only the line running toward the heater. The 5-meter standpipe listing identifies Eberspacher and Webasto applications and replacement numbers, but provides limited dimensions and package details. Check whether your repair needs a standpipe, a line-and-filter kit, or both. If the product information does not show the necessary measurements or contents, seek confirmation before ordering.

Frequently Asked Questions

How do I know what size diesel heater fuel line to buy?

Check the heater’s required hose dimensions or measure the original line. Compare inner diameter, outer diameter, connection size, and length with the product listing. Do not choose based on length alone.

Are Webasto and Eberspacher fuel lines interchangeable?

Some listings describe kits for both brands, but that does not guarantee that every line fits every model. Verify the exact heater model, replacement number, dimensions, and connection style.

What is included in a diesel heater fuel line kit?

Contents vary. These listings include combinations of fuel hose, filters, connecting hoses, clamps, or standpipe components. Review the item’s package list to confirm it contains the parts needed for your repair.

Can I use a 5-meter line instead of a 16.4-foot line?

Those lengths are close, but length alone does not establish fit. Compare hose diameter, fittings, material requirements, and the route to the fuel source as well.

Should I replace the filter when replacing the fuel line?

Several kits include an inline filter, but the product details do not establish a universal replacement interval. Follow the heater manufacturer’s maintenance guidance and confirm that the filter included in a kit suits your setup.