Zeus tank problems, e-liquid or coil to blame?

A burnt taste by the third refill, a drop of liquid under the base, a flavour that fades within days. Faced with a Zeus tank that disappoints, most vapers reach for a fresh pack of coils. The bottle poured into the tank is just as serious a suspect, yet the shop pages that fill the first page of Google talk almost only about hardware. This head to head sets the two possible culprits against each other, symptom by symptom, using the documents Geekvape publishes on the range.

Zeus tank troubleshooting, is the e-liquid or the coil to blame?

When the fault appears settles most cases. A problem that starts right after a change of bottle points to the liquid. A problem that arrives with a new coil, or after several dozen millilitres on the same one, points to the coil.

The second test is to pour the previous bottle back in on the same coil. If the fault goes away, the liquid was to blame. If it stays, look at the coil, its wattage or the way it was fitted.

Wattage, in fact, needs checking before any verdict. A Zeus tank run outside the range printed on the coil box will burn or flood its wick whatever liquid goes in, and the wrong suspect then takes the blame.

Which coil sits inside your Zeus tank

Several tanks and the coils they take share the Zeus name. To tell liquid from hardware, the coil is what matters, because each family has its own wattage ranges and its own compatible tanks.

The Z series, from the Zeus Sub-ohm to the Zeus 5

The Zeus Sub-ohm, its 2021 version, the SE edition, the Zeus 5 and the Z Fli take the Z series, kanthal mesh coils that push in through the base of the tank, according to the listing for these coils on Geekvape’s official store. Its coil guide, updated on 25 April 2023, gives them the following ranges.

Z coil	Stated range	Note
0.15 ohm XM	70 to 85 W	The current generation
0.15 ohm original	80 to 90 W	Same value, different range
0.15 ohm SS316L	60 to 70 W	Stainless steel wire
0.2 ohm	70 to 80 W	Pre-fitted on the Zeus Sub-ohm and Zeus 5
0.25 ohm (dual mesh)	45 to 57 W	The guide lists no Zeus tank against it
0.4 ohm	50 to 60 W	The lowest of the Z coils matched to a Zeus tank

The listing for the original Zeus Sub-ohm nonetheless puts its 0.4 ohm Mesh Z1 at 60 to 70 W, ten watts above the guide. With the two documents at odds, the safer approach is to start at the bottom of the more cautious range and climb in small steps.

The M series, for the Zeus Max only

The Zeus Max uses a separate family, the M series, which Geekvape describes as compatible with that tank alone. Its listing gives the M 0.14 ohm 60 to 80 W, the M 0.15 ohm 85 to 100 W, the M 0.2 ohm 70 to 85 W and the M 0.3 ohm 55 to 65 W.

Burnt taste in a Zeus sub-ohm tank, the wick or the bottle

A burnt hit is the most common symptom and the one most often blamed on the wrong part. It comes from cotton that runs short of liquid at the moment the mesh heats up. The FAQ Geekvape devotes to its XM Boost coils describes both routes, the hardware one and the bottle one.

When the coil is to blame

A new coil fired before the cotton is soaked burns straight away, the manufacturer warns, and it asks for a wait of 3 to 5 minutes after filling. Too much wattage vaporises liquid faster than the wick can draw it up. Chain vaping has the same effect, since the cotton has no time to soak again between puffs.

These causes come down to settings and habits. They can be fixed without changing bottle, by dropping back into the range and leaving more time between puffs.

When the e-liquid is to blame

A liquid high in vegetable glycerine is thicker, soaks the cotton more slowly and gums up the mesh sooner. The ratio therefore weighs as much as the wattage, a trade-off our head to head on the PG VG ratio works through.

A very sweet recipe also leaves deposits on the mesh. The burnt taste that follows tends to show up later, after several refills, and comes back with every new coil if the same bottle stays in use.

Zeus tank leaking, seal, filling or a liquid that is too thin

On the Zeus Sub-ohm, the SE and the Zeus 5, air enters at the top of the tank and travels down to the coil. The Zeus 5 presentation and user guide page published by Geekvape credits this layout with clearly reducing leaks, since the air slots sit above the liquid. That shortens the list of suspects.

On the hardware side

That page asks users not to overfill the tank and to check the position of the sealing ring every time the glass is changed, a worn ring being swapped for the spare in the box. A base not screwed back fully under the glass will also let liquid through. In the UK, refillable tanks are limited to 2 ml under the Tobacco and Related Products Regulations 2016, so the version on sale is the 2 ml one, and such a small chamber is easy to fill past the mark.

On the e-liquid side

A thin liquid, high in propylene glycol, runs through the wick of a low-resistance coil faster than the coil can vaporise it. The excess pools around the mesh, gurgles on the draw and ends up seeping under the base. This fault usually appears with a new bottle thinner than the last, which sets it apart from a tired seal.

Fading flavour, sugar, nicotine and coil wear

A flavour that drops away without any burnt note usually means a coil near the end of its life. The useful question is how much liquid it has already vaporised, and which bottle wore it out.

Coil life is counted in millilitres

An XM Boost coil is rated for 50 to 60 ml of liquid, a figure that shifts with the ratio, the recipe and the pace of vaping. Keeping a note of the millilitres poured in since fitting gives a more reliable marker than counting days.

The value you choose changes that sum. In the FAQ for its Z coils, Geekvape states that the 0.2 ohm uses more e-liquid than the 0.4 ohm, which gives a cooler vape and a balance between flavour and vapour. On a 0.2 ohm, the 50 to 60 ml limit therefore arrives in fewer refills, through no fault of the recipe.

Sugar and nicotine, two settings of the bottle

Dessert and very sweet recipes shorten the life of the mesh, while a light fruit or a menthol generally gums it up more slowly. Nicotine matters as well. The Z series is described as compatible with nicotine salts, yet Geekvape recommends a freebase liquid of 3 mg/ml at most for its XM Boost coils. In the UK, nicotine e-liquid is capped at 20 mg/ml in 10 ml bottles, and a low strength on a large bottle comes from shots, as our verdict on the 100ml shortfill explains.

The head to head table, symptom by symptom

The table brings together the five common Zeus tank symptoms, the suspect on the liquid side, the suspect on the coil side and the test that tells them apart without buying anything.

Symptom	If the e-liquid is to blame	If the coil is to blame	First test
Burnt from the first puffs	Very thick, high VG liquid	Priming too short, wattage above the range	Wait 3 to 5 minutes, drop to the bottom of the range
Burnt after several refills	Very sweet recipe	Coil at the end of its 50 to 60 ml	Count the millilitres poured since fitting
Leak under the base	Thin liquid flooding the wick	Misplaced or worn seal, loose base, overfilled tank	Check the seal and screw the base back
Gurgling	Thin liquid	Wattage too low for the value	Add a few watts without leaving the range
Flat taste	Liquid left in the tank too long	Worn coil	Pour a known bottle onto a new coil

Our verdict is clear. On a Zeus tank, the coil and its settings remain the first suspect for four symptoms out of five. The liquid takes over as soon as the fault follows the bottle from one coil to the next, and then it is the ratio or the sugar that needs changing, not the hardware.

FAQ

These five questions come up often when looking after a tank from this range. The answers stay short.

How do you remove a worn coil from the Zeus 5?

Turn the tank upside down, unscrew the base anticlockwise, then pull the coil out with the tool supplied in the box. The new one pushes into place, and the base screws back clockwise until it locks.

Do you need a new coil to change flavour?

Geekvape advises it, just as after a burnt taste or when liquid has sat in the tank for more than two weeks. The cotton holds on to part of the previous flavour, especially after a menthol or a strongly flavoured recipe.

Can the tank be rinsed between two liquids?

Yes. With the coil removed, the tank can be rinsed with water and left to air dry before it goes back together. Putting a coil soaked with water back into the tank is best avoided.

Is there a Zeus tank for mouth to lung vaping?

Yes, the Z MTL Tank. It takes A series coils, 0.8 ohm (12 to 16 W) and 1.2 ohm (8 to 12 W), built for a tight draw and far below the wattages of the Z series.

Does an M coil fit a Zeus 5?

No. M coils are reserved for the Zeus Max, and the Zeus 5 only accepts the Z series. The two families do not swap between these tanks.

Zeus tank fixes, change the bottle before the coil

A good diagnosis follows an order. Check the wattage range, then pour a known bottle onto the same coil, and only after that buy a new pack. That simple trial separates liquid from hardware before anything new is bought.

For a Zeus tank, the easiest liquid to diagnose is one whose ratio and strength you know, not too sweet and suited to a low-resistance coil. The same method works for comparing the other e-liquids covered on this site, bottle against bottle, on a setup you know is correctly tuned.

Editorial content for adult readers only. This article is not a buying recommendation. Vaping products can contain nicotine, which is a highly addictive substance. Vaping products are not for sale to anyone under 18 in the UK.