How to fill an oil lamp and light it without smoke
Updated: 23 October 2026
You have the bottle and the lamp, and you want to know how to fill an oil lamp without smoking the glass. Check the lamp, leave air in the font, soak the wick for the time the bottle and the maker both allow, light a small flame, then lower the wick to put it out. Peter F. updated this page on 23 October 2026, using John Moncrieff, the Barrettine indoor label, and Scottish Fire and Rescue Service advice. We did not time the five bottles in the [lamp oil comparison](/hub/diy-supplies/lamp-oil). Which bottle to buy stays on that page and the [lamp oil buying guide](/hub/diy-supplies/lamp-oil/sub/lamp-oil-buying-guide). A qualifying purchase through our links can earn a commission at no extra cost to you.
You have the bottle and the lamp, and you want to know how to fill an oil lamp without smoking the glass.
You have the bottle and the lamp, and you want to know how to fill an oil lamp without smoking the glass. Check the lamp, leave air in the font, soak the wick for the time the bottle and the maker both allow, light a small flame, then lower the wick to put it out. Peter F. updated this page on 23 October 2026, using John Moncrieff, the Barrettine indoor label, and Scottish Fire and Rescue Service advice. We did not time the five bottles in the lamp oil comparison. Which bottle to buy stays on that page and the lamp oil buying guide. A qualifying purchase through our links can earn a commission at no extra cost to you.
Our top picks
| Badge | Product | Fuel type | Scented | Stated use | Note | Price | Offer |
|---|---|---|---|---|---|---|---|
| Best overall |  CUQOO CUQOO citronella oil, 6 x 1 L | Citronella n-paraffin | Yes, seller | Outdoor torches | 7.0 | about £25.99 | View offer |
| Best value |  Clearell Clearell indoor paraffin, 5 L | C1 paraffin | No scent claimed | Heaters and lamps | 6.6 | about £19.95 | View offer |
| Alternative |  Generic Dheepam lamp oil, 1 L | Mineral oil | Not stated | Diyas and ceremonies | 5.7 | about £8.99 | View offer |
On this page
Before you pour
Use a colourless lamp oil or paraffin that the lamp is sold for, on a lamp that sits flat and has a chimney without cracks. Scottish Fire and Rescue Service puts the checks in that order: a stable base, a trimmed wick, spare oil away from children and heat, and no overfill. A cracked glass or a loose burner is a reason to stop. If the lamp is a storm lantern, the fuel limits are tighter, and they live on the hurricane lantern fuel page.
Smell the liquid before you commit a full font. Citronella torch oil is scented and, in this set, often reviewed as thick. That is a cause of soot and of wicks that char, which the citronella oil or lamp oil page explains. Do not finish the job with petrol, barbecue lighter fluid, methylated spirits, or diesel because the right bottle is empty. Those liquids flare in a wick lamp.
If the tip is dry or burned hard, trim it before you soak. Lighting a dry wick burns cotton. The flame should burn vapour from oil the cotton has lifted, and a new wick usually needs one height adjustment after the first lighting.
Fill, then wait
Take the burner or the font out if that is how your lamp is built, and pour on a tray. John Moncrieff fills a traditional lamp about three-quarters full with colourless lamp oil or paraffin. Use the mark on your own font if it has one, and leave that air gap. A hobby note of about 12 mm of air under the filler, from Steam Tent Co-operative, describes many fonts. It is not a law and not a measurement of your lamp. Overfilling spills when the burner goes back on, and paraffin on a hot gallery is how a small lamp becomes a bigger flame.
Soak times do not agree, so follow the longer instruction. CUQOO and the Barrettine indoor label say 5 minutes. John Moncrieff says about 30 minutes for a traditional lamp, so the wick is wet through. A torch built around a 5-minute soak does not need half an hour if the lamp maker agrees. The wick above the burner should look oiled, not pale.
Light only after that wait. Never leave the lamp unattended once it is alight, which is the warning Barrettine prints. If the flame will not catch, the usual cause is a wick that has not drawn oil yet. Waiting longer is the fix. Adding a splash of a different fuel is not.
A small flame is the clean flame
Wind the wick up until it catches, then bring it down until the flame is modest and the glass stays clear. A flame that is too high smokes. The soot is carbon from that tall flame, or from oil the wick cannot lift. Barrettine says shorten the wick if it smokes. Shorten it. Do not buy a second scented bottle and hope the glass clears.
If you poured citronella and the glass blacks within minutes, thick oil may be leaving the tip dry so the cotton chars. After the lamp is cold, empty it and change to a clear unscented lamp oil. If the fuel was already right and the flame was simply too high, trim the char and keep the flame small.
Out, cool, and out of reach
Extinguish by winding the wick down until the flame goes out. Do not blow across a hot chimney. A blast of air can push the flame into the font or crack the glass. Let the metal and the glass cool before you refill, trim, or store the lamp. Cap the bottle. Spare oil stays out of reach of children and away from the heater, the cooker, and the lamp you just put out.
Do not carry a lit lamp. Put it out, let it cool, then move it. If you need light in another room, light a second lamp there, or carry a cool one and light it only when it is standing still. Fit a carbon monoxide alarm where oil is burned indoors, and ventilate. A clear glass is not a measured room.
Stop and get help if the flame runs away, if the lamp leaks while alight, or if people feel ill around a paraffin appliance. A trimmed wick will not fix a cracked font. Store the bottle upright and closed, and do not decant torch oil into an old lamp-oil bottle.
Common questions
How full should the font be?
About three-quarters, if you follow John Moncrieff, or up to the mark on your own font. Leave an air gap so the burner seats without a spill. About 12 mm under the filler is a hobby description of many fonts, not a rule for every lamp. If oil wells out when you seat the burner, you have overfilled it. Empty a little back into the bottle, with the lamp cold, before you light.
How long do I wait before lighting?
Read both instructions. CUQOO and the Barrettine indoor label say 5 minutes. John Moncrieff says about 30 minutes for a traditional lamp. Use the longer time when the lamp maker prints one, and do not light a wick that still looks dry. There is no third soak time for the bottles in this comparison. If 5 minutes leaves the tip pale, wait. Do not help it with lighter fluid.
Why is the glass black?
Usually the flame is too high, or the wick is burning cotton because the oil is too thick or too low to climb. Shorten the wick and keep the flame small if the fuel is the clear lamp oil the lamp asks for. If you poured a scented torch oil and the soot appears at once, the oil is the likely cause. Let the glass cool before you clean it. Do not scrape hot soot with the lamp still alight.
How do I put the flame out?
Wind the wick down until the flame goes out. Do not blow across the chimney. Leave the glass and the gallery to cool before you move the lamp, refill it, or pack it away. Cap the bottle and keep spare oil away from children as part of the same step. A lit lamp does not travel from room to room.
Can I light it if the wick looks dry?
No. A dry or crusted tip burns the cotton, chars, and smokes, even when the font is full of the right oil. Trim the dead end, confirm the wick reaches the oil, and soak for the time on the bottle and the lamp. Then light. If it still will not draw, the liquid may be too thick for that wick, which is a fuel problem rather than a match problem.
What if a child swallows the oil?
Do not induce vomiting. Call 999 if they may have swallowed a harmful amount, if they are unconscious, or if they cannot breathe properly. Call NHS 111 if you are unsure. Sucking the wick counts as exposure in the warning printed for these fuels. Keep the filled lamp and the bottle out of reach afterwards. This page does not give a home remedy or a dose.
Related pages
Sources
Public UK sources and the amazon.co.uk listings compared on this page. Shelf prices are from the stored captures, not a live re-check on 21 October 2026. Updated 23 October 2026.
- Business Companion: candles, diffusers and oil heaters (retrieved 23 October 2026)
- GOV.UK: kerosene general information (retrieved 23 October 2026)
- SI 1999/2084 decorative lamp fuels (retrieved 23 October 2026)
- HSE: biocides scope (retrieved 23 October 2026)
- NHS: poisoning (retrieved 23 October 2026)
- Scottish Fire and Rescue Service: oil lamps (retrieved 23 October 2026)
- Barrettine indoor lamp oil label (retrieved 23 October 2026)
- Barrettine premium paraffin (retrieved 23 October 2026)
- Feuerhand: fuel for a storm lantern (retrieved 23 October 2026)