Refilling a refillable vape pen requires following the correct steps to ensure the device operates properly, extends its lifespan, and ensures safe use. Below are the detailed steps for refilling e-liquid and precautions:
(Note that Regardless of whether you use Oil, E-liquid, or other liquids, the filling process is generally the same, so no distinction is made in this article.)
Preparation Before Refilling E-Liquid
Confirm the Device Type
Check whether the vape pen is refillable, typically equipped with a detachable tank or atomizer core. Non-refillable devices (such as disposable vape pens) do not require refilling and should be replaced directly. If you have purchased empty vape devices directly from a vape hardware manufacturer, they usually provide unsealed devices, requiring you to fill the oil and seal them yourself. Once sealed, secondary refilling is generally not supported.
Prepare Tools
- E-liquid/Oil: Choose e-liquid compatible with the device. Oils with different viscosities have varying requirements for heating temperature and device voltage. Incompatible devices may cause dry burning or failure to produce vapor.
- Clean tissue or soft cloth: Used for wiping.
- Needle-tipped dropper: The filling hole is usually small, requiring a syringe or needle-tipped dropper for injection. Some e-liquid bottles come with a dropper for precise filling.
- Gloves: Optional, to avoid skin contact with e-liquid.
- Safety Tips: Avoid operating in humid or high-temperature environments. Ensure the device is turned off or powered down (for variable voltage devices, turn off the power). Keep away from children and pets.
Steps to Refill E-Liquid
1. Disassemble the Oil Tank
- Rotating Tank: Rotate the tank counterclockwise until it detaches from the main body.
- Press-Type Tank: Gently press the clip or side button to release the tank.
- Bottom-Fill Device: Some devices require unscrewing the bottom screw or rotating the base.
Note: Ensure the device has cooled down before operation to avoid burns.
2. Identify the Filling Port
The tank typically contains a metal or ceramic atomizer core, with the filling port located around or at the top of the core. Avoid dripping e-liquid directly into the central air intake hole of the atomizer core (this may cause leakage or burning). Refer to the device manual or the brand's official instructions to confirm the filling port location.
3. Refill E-Liquid
- Tilted Filling: Tilt the tank at a 45-degree angle and slowly inject e-liquid along the inner wall of the tank using a dropper to avoid air bubbles.
- Control the Amount: Do not exceed the tank's marked "MAX" line (typically 80%-90% of capacity). Overfilling may cause leakage or inhalation of e-liquid.
- Avoid Contact with Atomizer Core: E-liquid should be dripped onto the tank's inner wall or cotton reservoir, away from the metal part of the atomizer core.
4. Reassemble
Wipe excess e-liquid from the tank and device connection points with a tissue. Align the tank with the device interface, rotate clockwise, or press until fully closed. Ensure a tight connection to avoid air or liquid leakage.
5. Rest and Use
- Rest for 5-10 Minutes: Allow the e-liquid to fully penetrate the atomizer core's cotton wick to prevent dry burning.
- Test with Small Puffs: Take 2-3 light puffs before first use to check for leaks or unusual odors.
- Adjust Power: For variable voltage devices, start with low power and gradually increase to an appropriate level.
Precautions
- E-Liquid Selection: Avoid using expired or deteriorated e-liquid (darkened color or sediment). High concentrations of nicotine or cannabis extract may cause throat irritation; start with a low concentration.
- Replace Atomizer Core: Replace the atomizer core when burnt flavors or leaks occur (typically every 1-2 weeks).
- Safe Storage: Store e-liquid in a cool, dry place, away from sunlight and children. Avoid getting e-liquid in eyes or mouth; if contact occurs, rinse immediately with plenty of water and seek medical attention.
Troubleshooting
- Leakage: Most empty devices are designed such that the airway and oil chamber are connected before the mouthpiece is sealed, lacking a stable sealed environment. If left exposed for too long after filling, the oil may leak from the airway due to gravity or pressure differences. Therefore, it is recommended to seal the mouthpiece within 3 minutes of filling. Also, check if the tank is overfilled, if the sealing ring is damaged, or if the assembly is tight. Learn more about vape leakage issues.
- Burnt Taste: This may be due to dry burning of the atomizer core or a high PG ratio in the e-liquid. Replace the atomizer core or adjust the power.
- No Vapor: Check the battery level, ensure the tank is installed correctly, or verify if the atomizer core is clogged.
FAQ
Q: Can I mix e-liquids from different brands?
A: Yes, but it may affect the flavor or shorten the atomizer core's lifespan. It is recommended to use e-liquids from the same brand or similar formulations.
Q: Do I need to turn off the device when refilling e-liquid?
A: It is recommended to turn off the device power (for variable voltage devices) to avoid short circuits due to misoperation.
Q: How do I know if the tank is full?
A: Observe the tank's scale line or liquid level; stop filling when it approaches the top.
How to Refill Oil in Our Disposable Vape Pens
ASM GROUP LIMITED, established in 2019, is a company specializing in atomizer production and R&D and one of the top three global CBD/THC vape hardware manufacturers. If you have purchased our vape devices, refer to the following oil-filling tutorials or contact us for one-on-one guidance.
ASM - GD Filling Instructions

- Check that the silicone mouthpiece is securely attached.
- Use a needle to inject oil into the green-marked hole (avoid the red airflow hole).
- Reattach the silicone mouthpiece within 1–2 minutes.
- Store at 68–77°F (20–25°C).
ASM - D3 Filling Instructions

- Open the vape box.
- Use the two side holes (green ✔️) to fill, avoid the center hole (red ✖).
- Slowly inject oil, do not overfill.
- Press the mouthpiece back within 1–2 minutes and let the cotton wick absorb oil.
- Store at 68–77°F (20–25°C).
ASM - X1 Filling Instructions

- Open the vape box.
- Use the two side holes (green ✔️) for oil filling, avoid the center hole (red ✖).
- Press the mouthpiece firmly within 1–2 minutes to seal.
- Store at 68–77°F (20–25°C).
By following the above steps and precautions, you can safely and efficiently refill your refillable vape pen with e-liquid, ensuring the best user experience.
