--- title: Petrol in a Diesel Car Knowles Hill — Next Steps canonical: https://www.petrolinadieselcar.co.uk/petrol-in-diesel/knowles-hill-devon/ location: Knowles Hill county: Devon latitude: 50.532490 longitude: -3.607890 service: Petrol in a Diesel Car updated: 2026-10-03 --- # What Happens Now: Petrol in a Diesel Car in Knowles Hill Stop. Motor off. Leave it that way — no second on, no moving it at all. Drained and purged, right where it sits: that is generally all an unrun diesel with petrol in it takes. Whether it remains that simple rests on the minutes ahead far more than on everything else. From here on, in order, wherever you are in Knowles Hill: ## Engine off: minute one with petrol in a diesel Go through these in sequence, before you do anything else. - The keys out of your ignition. Switching the ignition on can be all it takes to prime the fuel system, while priming pulls petrol out of the tank towards the components it harms. Keep it off altogether. - No diesel on top. More fuel in removes none of that petrol — it just leaves you with extra of the same blend. - Visibility comes before the rest near moving traffic: put the hazards on, and only then deal with anything else. - Off the pump by hand. On a forecourt, ask the staff to help you roll the vehicle away from the petrol pump. Do not fire it up to move it, however short the distance. - Which fuel, and roughly how much? Your receipt replies both, and that is where our questions start. Never throw it away. On the M5, under 15 miles from Knowles Hill, the next exit is the location to leave the vehicle; anywhere, the first sensible place to stop. Don't press on to the services. Then go back to stage one. ## Each Knowles Hill fuel drain starts here: has your motor run? From this point on, everything comes down to a single answer. Not run, not even briefly: - All the petrol remains in the tank, and just there. - The work is a simple drain and a flush, usually done where the vehicle is. - No place is better, and it is why the first step matters so much. If your engine has been run, even briefly: - From that tank, through the filter, into the fuel lines: that is how far the petrol has got. - On a bigger run it has reached your high-pressure pump as well as your injectors. - The further it went, the bigger the job — your lines, the fuel filter, and now and then more besides. The line falls there since diesel lubricates the high-pressure pump and the injectors on its way through them — and petrol does not. Petrol sitting in a tank damages nothing. As soon as it is pumped, petrol starts grinding whatever moves it. ## Knowles Hill, petrol in a diesel: have these ready before you call A little planning is the difference between a technician that finds you and a technician that goes round. - The ideal place to start is a postcode — one starting TQ12 2 — for where you are. - A road name helps: Cricket Field Road, say, or whichever street you've stopped in. A car park does the trick too. - What a car park serves is the quickest way to find it, so mention the landmark — like the one at Asda. - Say what the vehicle is — make, model — and confirm it's diesel. - What got in. Petrol, or AdBlue. AdBlue is a separate job with its own page for Knowles Hill, and so say which. - The amount: your receipt's litres, or else how long you had the nozzle in. - Whether it has run. Then if it has, how far and how hard. - Hire or company car? Some contracts need the owner's go-ahead for the work, and sorting it before we get there is faster than after. Next, 0333 366 0103. Not urgent, the vehicle left at home with nowhere to be? Then will do too. ## Waiting for a fuel drain around Knowles Hill: what to do Stick to these: well-meant help causes the damage during the wait. - Stay with your car if it is safe where it is — but if it has stopped somewhere dangerous, you come first: away from the traffic, waiting apart from it. - No one — however helpful — starts it, whether to see if it runs or to move your car a short way. - No additives. Two-stroke oil, injector cleaner, something from the boot — none of that takes the petrol back out. - Siphoning petrol into a can at the roadside is hazardous — and it also leaves whatever fuel has already gone beyond the tank. Do not try a home-made drain. - Keep the ignition off — the windows and the radio too. ## When the van arrives: the fuel drain, step by step - Our quote comes after three queries, not before them — what was put in, how much, and if it's run — because the replies shape the job. - Your tank is drained. The contaminated mixture comes out of your tank. - The fuel lines are flushed. If it ran, that petrol has moved beyond your tank, and the fuel lines are holding it. - Where the vehicle has a usable filter, it is swapped; if not, cleared. - Priming follows after fresh diesel is in. - Starting up. After your system is bled with fresh diesel, our engineers start the engine and make sure it runs smoothly. Our engineers remain until it's running on fresh diesel. If it has been spotted early, long-term damage is very unusual, and your car goes back to normal driving straight away. ## After the fuel drain: back on the road in Knowles Hill - Drive normally. There is nothing special to do once it's been started on clean fuel. - The first miles are the test. A warning lamp, exhaust smoke, a rough idle or a flat throttle is your signal to stop then call us once more. - An insurer, a fleet manager or a hire firm may ask what was done, and so keep your documents. - The handle's colour is not the thing to go by next time — the label on the petrol pump is. ## About Knowles Hill and where it is Knowles Hill is a suburban area situated on the riverside in Devon, with a relatively low elevation of 9 metres. Knowles Hill lies near the city of Exeter, approximately 13.5 miles away, and is also close to other nearby places such as Newton Abbot and Abbotsbury. Knowles Hill has a population of around 6696 people and predominantly features terraced housing. Knowles Hill is located in the South West region of England, about 165.6 miles from London. ## Fuel drains around Knowles Hill and the places nearby Petrol in diesel call-outs around Knowles Hill and in Newton Abbot, Abbotsbury or Broadlands all reach the same vans, which reach most of Devon as well. Ring and ask rather than assuming if you are somewhere hard to explain or close to a boundary. ## Leave it off and ring: petrol in a diesel in Devon Motor off. Keys out. Receipt in your pocket. That's the whole of step one, and Petrol in Diesel takes it from there — by the roadside, at the forecourt or on your drive.