--- title: Drain Petrol From a Diesel Car — Blackawton canonical: https://www.petrolinadieselcar.co.uk/petrol-in-diesel/blackawton-devon/ location: Blackawton county: Devon latitude: 50.345750 longitude: -3.682960 service: Petrol in a Diesel Car updated: 2026-10-02 --- # Petrol in a Diesel Car in Blackawton With the tank still carrying the fuel and the engine not yet run, almost every job takes only a drain, so leave the motor off. That outcome is determined in the minutes straight after the fill-up, and not by the amount that got in. All over Blackawton and the remainder of Devon, Petrol in Diesel drains the car and flushes it where it is, whether by a roadside, on a driveway or at a forecourt. Our team can tell you what your next move is. Ring us — that happens ahead of anything else. ## Petrol in a diesel: what to do next - Feed a petrol motor diesel and it will normally fail to run at all, so the driver stops there and so does the harm. Feed a diesel petrol and the car starts, it idles, it moves off — all right for a couple of miles. Most people have that backwards, which is the thing they get wrong about petrol in a diesel especially. So don't start the car. And once started, never trust it: the fuel system is grinding while you drive. - Flicking your ignition on usually primes that system, and priming is what draws petrol out of that tank then into the pump and injectors. Those are the parts diesel keeps lubricated on its way through, before it burns. Petrol handles the burning and none of the lubricating. Leave your ignition alone. - Do not pour diesel on top to weaken it. A diesel fuel system won't handle petrol by percentage in the way that advice implies, and topping up takes out nothing — it simply hands you a larger tank of the same mix. The type makes no difference either: super unleaded is still petrol. - Sit tight if it's sensible to. Hazards on, motor off, keep it. Wherever you have stopped — the verge on Park Lane, anywhere — a difficult spot for us trumps a started motor, and nothing is easier for us to deal with than a car that never shifted. - Before you call, work out your whereabouts. Anything closest to you with a name on it, plus a postcode that starts TQ9 7 — that's what decides whether our van shows up or circles. - Three details decide the entire job: the fuel you poured in, the approximate volume involved, and whether it has been turning since. The number is 0333 366 0103. ## Can petrol be pumped out of a diesel at a forecourt? The work kicks off at a forecourt, generally. Frequently it ends there too. If you're still at the forecourt at BP, that is typically where the drain gets done — we work on station forecourts all the time, with the owner's permission. No place except a garage can this be stopped with the engine still unstarted. We can still sort it out where it is, even away from the pumps. In a car park, on a drive or in a lay-by, the car has been fired up and moved there, and that sucked fuel through your filter and into your high-pressure pump, right from that tank. None of that is a disaster, but the flush then has to go past your tank to the fuel lines and the fuel filter, and the few seconds between reading the till receipt and going for the key are what determine that. Out from the pump, the next customer can get past — so yes, let the attendants help you roll it. Well worth doing. Firing it just to roll four vehicle lengths isn't. ## Service in Blackawton Blackawton is a rural village, so we get out to the town and to the villages near it on the same trips: Woodford, Millcombe, Bow, Hutcherleigh and Eastdown. If yours is not on that list it doesn't mean we don't come — there are pages for most towns in Devon, and the ones mentioned above are merely the immediate neighbours. Call us to enquire rather than guessing — borders above all, and anywhere your satnav can misread. The ground the page spans is on this map. Kerbside, forecourt, private drive, car park: the lot is ground our technicians serve, and none of that requires your car to travel to us. You'll be advised to shift the car out of that gateway and sort it out later. Do not. On the zig-zags by Blackawton Primary School, a misfilled Skoda Octavia running on diesel is in the way, and that is all it is. Fire it up three more times being courteous and you have turned a tank into a fuel system: every start primes the fuel lines, every prime drags more petrol through the fuel filter on to your pump. Let them grumble. Phone. ## Stopped at the roadside anywhere in Blackawton? A chance to stop somewhere sensible doesn't fall to everybody. Set off, then noticed? Landed by the verge of School Lane, or stuck in some lay-by with your hazards going? That's a common call here. Not an odd one. Whether you sit by your car or step clear of it depends on if sitting nearby is wise. Never fire it up to reach a safer spot. It will go — a diesel on petrol generally obliges — and each mile of obliging pulls the mix deeper into the system. A technician coming to an awkward spot is no bother for us, and it's far better for your car than carrying on. Try the journey home from The George Inn? Not a chance. It will start and it will move off just fine, which is the trouble — a diesel on a thinned tank acts typically while grinding the components the fuel should be protecting. Leave the Ford Focus and phone us. ## So you've driven it? Petrol in a diesel over some miles under 25 miles out of Blackawton, the M5 is what counts here. It will often take you onto it, and some way along, before you notice a thing. Then it's smoke, a rough idle and power draining away — not a neat stop. Misfuelled diesels rarely give you one of those. The next safe exit is the one to take. Turn off there, then leave the restarting alone. Suppose the worst of it on a long trip. Anything approaching the under 25 miles to the nearest city, and the contamination has been through the fuel filter, through your pump, through the fuel injectors. Mention it when you ring. What our technicians bring differs. Injection pressure is the thing being lost. Petrol thins diesel, and weaker fuel slips past the tightly fitted parts that are meant to build that pressure, so the further a diesel Dacia Duster travelled, the less well it held. Fine on the way out and sluggish on the way back is how the drive to Bow Wood went, then, and that tank is the place to look. Stop somewhere sensible, turn off and call us. ## A bit about Blackawton Blackawton is a small village in Devon, situated inland at an elevation of 134 metres, and is characterized by its predominantly detached housing stock. Blackawton lies near the villages of Woodford, Millcombe, and Bow, and is approximately 20 miles from Plymouth. Blackawton has a population of around 511 residents, and its rural setting provides a quiet environment for those living there. Blackawton is also relatively distant from London, at a distance of 174 miles. ## What our technicians do when our technicians reach you around Blackawton - We establish what got in, how much, and if your engine has run. The answers alter the work, which is why our technicians ask before pricing. - The polluted fuel is pulled from the tank. - What is remaining in your system shouldn't be what caused the trouble, so your fuel lines get rinsed and the fuel filter cleaned. - Clean diesel goes in, and then your system gets bled. - Your engine is turned on and checked to confirm it runs smoothly on fresh diesel. At that point it is ready to pull away. Permanent damage is very uncommon when it has been caught early, and as all of this is done where your car is, it never needs to go to a workshop. ## AdBlue in a diesel tank around Blackawton is a distinct problem If what was put in was AdBlue instead of petrol, the first rule is unchanged — do not start it — but the problem is not. Petrol does two things to diesel: dilutes it, and removes the protection the fuel system relies on. AdBlue? Urea dissolved in water. Pour that in with your diesel and you get corrosion instead, plus build-up. Both are ours. There's a separate Blackawton page for AdBlue removal, with the full story on it — including the reasons it often turns out to be the worse of the two. A throttle gone soft, white smoke, a lumpy idle, knocking: that's a misfilled diesel Mercedes E-Class telling you what is wrong. Never start it to find a better place — turn off where you have stopped, close to Blackawton Village Hall or anywhere else. ## How much is a petrol-in-diesel drain in Blackawton? We can't put one number on this page frankly, as the job is not one job. What moves it: - This is the key one: whether your motor has been started, or driven. - Wrong fuel in, against what the tank takes — that ratio. - The sort of liquid in the tank, petrol or AdBlue. - Where is it? And can our van reach it and work there sensibly? The vehicle, the quantity, whether it has run — give us those and the answer comes back straight instead of as a range. Vehicle at home, going nowhere, nothing time-critical about it — is fine for that. It got a few streets and stopped. The throttle went dead, your idle turned uneven, and your diesel Audi A3 is now resting by Woodlands Family Theme Park. That sluggishness is the fuel failing to build pressure correctly rather than the motor failing — and because there's no warning light for it, motors in that position typically get driven a second time before anybody phones. Don't. Turn it off and call us. ## Petrol in diesel queries from Blackawton motorists ## At a petrol station around Blackawton, can you do a fuel drain there? Yes — forecourts are where a large share of this happens. Agreement from the site is the condition. Given that, a forecourt like Sainsbury's is somewhere we're frequently, along with the rest of them locally — so name yours on the phone and you'll hear if working there's possible. ## Is there a safe quantity of petrol in a diesel? Proportion settles it rather than litres — and more than either, whether the motor has run. Five litres into a nearly dry tank isn't five into a full one, no. But both land on the same question in the end: has that mixture been pulled right through, or has it not? ## Petrol in my diesel, and I have driven the car Pull in somewhere safe, turn off, then keep it off. It is fixable a lot more often than drivers expect, even though driving is what moves the problem from that tank into your pump and injectors — and the single most useful thing you can do now is not restart it. ## Fuel drains and manufacturer warranties No. Carried out correctly, clearing and rinsing is no alteration at all, and the warranty from your manufacturer is unaffected by it. Another reason to leave it turned off: running a diesel on petrol is the thing more likely to cause a disagreement with one. ## Can I just add two-stroke oil and drive home? No. Two-stroke oil is an old fix for a different fault and it does not put back what petrol has thinned. After that? Still petrol in that tank, and a pump that has to put up with the stuff. ## A main dealer for petrol in a diesel — essential? Wherever the car is, our engineers drain and flush it there, so a trip to the main dealer doesn't come into it. ## Still with the car? The motor stays off. Already driven it? Then pull in somewhere sensible, switch off, and let it stay that way. Cold and parked, a vehicle is in the best place available — and drivers fear this far more than the recovery rate warrants. Across Devon and around Blackawton: call-out fuel draining, at home or on the forecourt or at the kerbside.