Fuel FixerWales Call 01295 380724

The wrong fuel blog for Wales

Short answer

This is the wrong fuel blog for Wales: practical, local advice for 256 towns, cities and districts across Wales. Four guides for each place: what to do at the roadside, what a drain really costs, the fuel problems that come with a Welsh winter, and how to avoid the mistake at the pump in the first place.

Every guide is written for a specific place and reviewed by our wrong-fuel team. Pick a topic, or find your town below.

Call 01295 380724 — 24/7, all of Wales

Isle of Anglesey / Ynys Môn — 5 places coveredGwynedd — 16 places coveredConwy — 11 places coveredDenbighshire / Sir Ddinbych — 7 places coveredFlintshire / Sir y Fflint — 5 places coveredWrexham / Wrecsam — 16 places coveredPowys — 9 places coveredCeredigion — 8 places coveredPembrokeshire / Sir Benfro — 10 places coveredCarmarthenshire / Sir Gaerfyrddin — 13 places coveredSwansea / Abertawe — 26 places coveredNeath Port Talbot / Castell-nedd Port Talbot — 12 places coveredBridgend / Pen-y-bont ar Ogwr — 8 places coveredVale of Glamorgan / Bro Morgannwg — 8 places coveredCardiff / Caerdydd — 35 places coveredRhondda Cynon Taf — 15 places coveredMerthyr Tydfil / Merthyr Tudful — 7 places coveredCaerphilly / Caerffili — 9 places coveredBlaenau Gwent — 5 places coveredTorfaen — 10 places coveredMonmouthshire / Sir Fynwy — 5 places coveredNewport / Casnewydd — 18 places covered
1,024 local guides across all 22 council areas. Tap a council area for the towns inside it.

Welsh team, local drainersA Welsh team and local drainers working every council area from Anglesey to Monmouthshire. Owned and run by Fuel Fixer Ltd — we are not a Welsh-owned company, and we do not claim to be.

Reviewed by Rambo S, Wrong fuel expert, Fuel Fixer · last checked 1 November 2026

The wrong fuel blog for Wales, by topic

Wrong fuel on the road in…

What to do in the first ten minutes after misfuelling.

CardiffNewportBarryPenarthCowbridgeCaerphillyBargoedBlackwoodRiscaPontypoolCwmbranEbbw ValeTredegarAbertilleryAbergavennyMonmouthChepstowCaldicotUskMerthyr TydfilAberdarePontypriddTreorchyTonypandyPorthMountain AshBridgendPorthcawlMaestegPort TalbotNeathPontardaweSwanseaGorseinonMumblesLlanelliCarmarthenAmmanfordLlandeiloBurry PortHaverfordwestMilford HavenPembrokePembroke DockTenbyFishguardSt DavidsNarberthAberystwythCardiganLampeterAberaeronNew QuayNewtownWelshpoolBreconLlandrindod WellsBuilth WellsMachynllethYstradgynlaisHay-on-WyeKnightonWrexhamMoldFlintConnah's QuayBuckleyHolywellRhylPrestatynDenbighRuthinLlangollenColwyn BayLlandudnoConwyAbergeleLlanrwstBangorCaernarfon

What a fuel drain costs in…

The £199–£1,999 range, and the four things that move it.

CardiffNewportBarryPenarthCowbridgeCaerphillyBargoedBlackwoodRiscaPontypoolCwmbranEbbw ValeTredegarAbertilleryAbergavennyMonmouthChepstowCaldicotUskMerthyr TydfilAberdarePontypriddTreorchyTonypandyPorthMountain AshBridgendPorthcawlMaestegPort TalbotNeathPontardaweSwanseaGorseinonMumblesLlanelliCarmarthenAmmanfordLlandeiloBurry PortHaverfordwestMilford HavenPembrokePembroke DockTenbyFishguardSt DavidsNarberthAberystwythCardiganLampeterAberaeronNew QuayNewtownWelshpoolBreconLlandrindod WellsBuilth WellsMachynllethYstradgynlaisHay-on-WyeKnightonWrexhamMoldFlintConnah's QuayBuckleyHolywellRhylPrestatynDenbighRuthinLlangollenColwyn BayLlandudnoConwyAbergeleLlanrwstBangorCaernarfon

Winter fuel problems in…

Water, diesel bug and AdBlue faults in the Welsh cold.

CardiffNewportBarryPenarthCowbridgeCaerphillyBargoedBlackwoodRiscaPontypoolCwmbranEbbw ValeTredegarAbertilleryAbergavennyMonmouthChepstowCaldicotUskMerthyr TydfilAberdarePontypriddTreorchyTonypandyPorthMountain AshBridgendPorthcawlMaestegPort TalbotNeathPontardaweSwanseaGorseinonMumblesLlanelliCarmarthenAmmanfordLlandeiloBurry PortHaverfordwestMilford HavenPembrokePembroke DockTenbyFishguardSt DavidsNarberthAberystwythCardiganLampeterAberaeronNew QuayNewtownWelshpoolBreconLlandrindod WellsBuilth WellsMachynllethYstradgynlaisHay-on-WyeKnightonWrexhamMoldFlintConnah's QuayBuckleyHolywellRhylPrestatynDenbighRuthinLlangollenColwyn BayLlandudnoConwyAbergeleLlanrwstBangorCaernarfon

Filling up in…

Why misfuelling happens at the pump, and how to prevent it.

CardiffNewportBarryPenarthCowbridgeCaerphillyBargoedBlackwoodRiscaPontypoolCwmbranEbbw ValeTredegarAbertilleryAbergavennyMonmouthChepstowCaldicotUskMerthyr TydfilAberdarePontypriddTreorchyTonypandyPorthMountain AshBridgendPorthcawlMaestegPort TalbotNeathPontardaweSwanseaGorseinonMumblesLlanelliCarmarthenAmmanfordLlandeiloBurry PortHaverfordwestMilford HavenPembrokePembroke DockTenbyFishguardSt DavidsNarberthAberystwythCardiganLampeterAberaeronNew QuayNewtownWelshpoolBreconLlandrindod WellsBuilth WellsMachynllethYstradgynlaisHay-on-WyeKnightonWrexhamMoldFlintConnah's QuayBuckleyHolywellRhylPrestatynDenbighRuthinLlangollenColwyn BayLlandudnoConwyAbergeleLlanrwstBangorCaernarfon

Wrong fuel by type

Coverage

What Welsh customers say

Rated 4.8 out of 5 from 6,053 verified reviews on Reviews.co.uk.

Reviews are collected independently and published in full — including the ones we would rather not have. Read every review on Reviews.co.uk or on our Google Business Profile.

Live review feed loads here. If it does not appear, read the reviews directly.

Background reading: Traffic Wales. Operated by Fuel Fixer. For what wrong fuel does to an engine, see Misfuel Doctor; south of the border, see Wrong Fuel.

Call now 01295 380724 — 24/7