Petrol in Diesel in Old St Mellons
A petrol in diesel in Old St Mellons is a job we do every week. Keep the key out of the ignition, call us, and we'll be with you in around 30–60 minutes to sort it on the spot.
Old St Mellons sits in South Glamorgan, and we cover it along with Adamsdown, Bedwas, Brackla and Caerphilly — reaching most call-outs via the Cardiff road network.
Coverage at a glance — Old St Mellons
| Service area | Old St Mellons, South Glamorgan |
|---|---|
| Postcode | CF23 |
| County | Cardiff |
| Distance | About 9.9 miles from Cardiff centre |
| Nearest routes | the Cardiff road network |
| Typical response | 30–60 minutes |
| Time on site | 45–90 minutes |
| Price from | £89 |
| Availability | 24/7, 365 days a year |
| How to book | Call 0800 170 0644 |
Prices & response times reviewed August 2026.
Old St Mellons lies about 9.9 miles from Cardiff centre, in Cardiff. We reach it alongside neighbouring Cyncoed, Llanishen, Pentwyn and Penylan.
How a petrol in diesel works in Old St Mellons
- Call 0800 170 0644 and describe the vehicle and what went in.
- We quote the full price up front and head to you in Old St Mellons.
- We drain the wrong fuel and flush the system on-site.
- We add clean fuel, test-start, and you're on your way — usually within 45–90 minutes.
Typical prices
| Situation | From | Time on site |
|---|---|---|
| Car, engine not started | £89 | 45–90 minutes |
| Engine started / fuel circulated | £149 | 1–2 hours |
| Van or large tank | £169 | 1–2 hours |
| Driven / motorway / out-of-hours | Quoted on call | On-site assessment |
Every job is fully quoted by phone before we're dispatched — the price depends on your vehicle, tank size and whether the engine was run.
What we drain
- Petrol in a diesel engine (the most common — and most damaging — misfuel)
- Diesel in a petrol engine
- AdBlue accidentally put in the diesel tank
- Unleaded in a diesel
- Red or agricultural diesel in a road vehicle
- Contaminated fuel — water, dirt or mixed fuel
Other services in Old St Mellons
in Old St MellonsUnleaded in Diesel
in Old St MellonsAdBlue in Diesel Tank
in Old St MellonsRed Diesel in a Road Vehicle
in Old St MellonsContaminated Fuel Removal
in Old St MellonsMobile Fuel Drain
in Old St MellonsWrong Fuel Rescue
in Old St MellonsFuel Drain
in Old St Mellons
Wrong fuel in Old St Mellons, whatever you drive
We drain cars, vans and commercials on-site. A few we help often:
Nearby areas we also cover
Immediately around Old St Mellons: Adamsdown, Bedwas, Brackla, Caerphilly.
As a nationwide service, Wrong Fuel In The Car covers all of South Glamorgan and the wider Wales — so wherever you are around Old St Mellons, help is on the way.
Wrong-fuel guides
Petrol in Diesel in Old St Mellons — FAQs
Do you cover Old St Mellons?
Yes — we cover Old St Mellons and nearby Adamsdown, Bedwas, Brackla, Caerphilly around Cardiff, reaching you via the Cardiff road network.
What should I do right now?
Don't start the engine. If you're on a forecourt, put the car in neutral and push it clear of the pump, then call 0800 170 0644.
How much will it cost?
Call-outs start from £89. We quote the full price on the phone before we set off, based on your vehicle and situation.
How quickly can you get to me?
Typically around 30–60 minutes, depending on where you are and traffic. We run 24/7, 365 days a year.
Will my car be OK afterwards?
In most cases where the engine wasn't run, yes — we drain and flush and you drive away. We'll tell you honestly if we think it needs a garage check.
Does my insurance cover this?
Misfuelling is often excluded from standard cover, though some policies and breakdown add-ons include it. Keep our paperwork in case you claim.