Diesel Fuel/Additive Funnel (with .f3d)

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This funnel works for both diesel additives and fuel, and opens a standard UK misfuel protection flap on diesel cars, like a forecourt nozzle. It's the result of weeks of testing and iteration, with common problems addressed:

• Most funnels don't open the misfuel protection flap, which makes them useless on modern cars.

• Narrow funnels require a fuel can spout.

• Most funnels have shallow walls and splash diesel, which makes decanting quickly impossible.

• Without an air backflow channel, diesel backs up and spills in some funnels.

• Store-bought funnels have rubber elements that dry out, crack, and shed into the fuel.

• Two-part funnels need gluing, and incorrect adhesives can flake into the tank.

• Additive-sized funnels take ages to fill a tank. Holding a 20L jerry can for 10 minutes takes real work!

Well-designed funnels such as this don't have these problems.

Just using additives? Not enough trunk space? See my compact funnel, likewise thoughtfully designed:

Printing

At 24.7 cm tall, the funnel prints in one piece on most mid-sized printers. But if you need an alternative length, use deacald-diesel-funnel-B_longstem.stl and trim the stem in your slicer.

The print is top-heavy. You will need automatic supports. It's also large, but its walls are thick enough to print at up to 0.6 mm layers while staying watertight. If you don't care about visible layer lines, print with tall layers. It will help print speed.

PLA warps in hot cars, so PETG or a more resilient plastic is recommended.

Remove stray strings before use, as otherwise they'll end up in your fuel filter.

Safety

Effort was taken to design this funnel to reduce splashing and other hazards. Nevertheless, when you use funnels like these, be responsible. They are inherently less safe than your forecourt nozzles.

The essentials:

• Review your country and region's rules for fuel spills.

• Diesel spills are slippery and pose a hazard to cyclists, motorcyclists, and pedestrians. Most regions have a phone number you can call for clean-up.

• Don't decant fuel near water bodies and storm drains to avoid water pollution, which may be a serious offense in some countries.

• Likewise, don't decant in the rain.

• Diesel ignites easily in small amounts, such as droplets held in FDM-printed micropores.

• Don't use with gasoline. Gasoline ignites easily, can damage some plastics such as PLA, and remember that this funnel bypasses the car's misfuel protection.

• Putting incorrect fuel or additives in your car will cause damage.

• 3D prints develop cracks along layer lines. Inspect the funnel before use.

Use responsibly: don't pollute the environment, injure yourself, or damage your car.

If you choose to sell or exploit this part commercially or distribute physical prints to users, remember that this may involve additional legal duties and safeguarding.

Modifications

Per the license, you are free to remix, mod, and build on it. The Autodesk Fusion source file is included.

Disclaimer

These design files are open-source and provided for free. They are provided as-is, with no guarantees, and not as a physical product. By manufacturing a physical part, the manufacturer agrees that they are responsible for legal and safety compliance in that process as well as distribution, should they decide to do so. Although significant effort has been made to design a safe part, the designer is not involved in the production or use of the part, and therefore accepts no responsibility for any adverse outcome.