--- title: Petrol in a Diesel Car Coombses — Fuel Drain canonical: https://www.petrolinadieselcar.co.uk/petrol-in-diesel/coombses-somerset/ location: Coombses county: Somerset latitude: 50.846920 longitude: -2.944020 service: Petrol in a Diesel Car updated: 2026-10-18 --- # Put Petrol in a Diesel Car in Coombses? Don't Start It With your tank still carrying the fuel and the motor not yet turned over, nearly every job takes only a drain, so keep your engine off. That outcome is determined in the minutes immediately after filling up, rather than by the amount that went in. Across Coombses and the remainder of Somerset, Petrol in Diesel drains your car and cleans it where it is, whether by a roadside, on a private drive or at a forecourt. Ring us and we will show you what follows from here before you do anything else. ## Your next five steps: petrol in a diesel - Do not fire it up. Turned on all the same? Then never depend on it. Diesel in a petrol motor normally won't run, so the person stops and the wear halts with them. Petrol in a diesel? It starts. It idles. It drives off normally, for several miles. Most people get that backwards. It isn't okay — your fuel system is wearing every mile you do. - Two jobs, diesel: it combusts, and on the way through it keeps the injection pump and injectors protected. Petrol only handles the one. That is why your ignition remains off also — flick it on and you commonly prime your system, and that's petrol exiting that tank for exactly those parts. - Never dilute it. Diesel tipped on top removes nothing, so all you have is more of what was already there, since percentage is not how a diesel fuel system handles petrol. Super unleaded? Just petrol. The octane makes no difference. - Sit tight if it is safe to. Hazards on, engine off, leave the car. Wherever you have stopped — the verge on Higher Coombses, anywhere — a tricky place for us trumps a started diesel, and nothing is easier for us to deal with than a vehicle that never moved. - Keep your location prepared before you call. A postcode starting TA20 2 and whatever is closest to you with a name on it is the difference between the van showing up and our van circling. - Dial 0333 366 0103. Say what was put in, roughly how much, and also if your car has run. Those three facts settle the full job. ## At the forecourt: clearing petrol from your diesel A large portion of this job ends up finished at a pump, because that is where it mostly begins. Still at Tesco? Then that is normally where it gets done. Garage forecourts are routine for us, with the permission of the station. Before the engine has run — a garage is the single location it is halted. Fuel drawn out of the tank and through the fuel filter, right to the high-pressure pump, is what happens when the engine is started and the car is moved to where it is now: the car park, the driveway or the lay-by, anywhere other than the forecourt. So the flush covers the filter and your lines together with the tank. That's still not a catastrophe, and our technicians sort it out where the vehicle stands. What decides it is whether the ignition was reached for in the seconds after your receipt was read. Attendants will normally chip in pushing it clear of the petrol pump, which lets the next motorist get past. Welcome the offer. Four car lengths is not worth a start. ## Coombses and the areas near it Coombses is a residential suburb, so our technicians get out to the town and to the villages by it on the same runs: Perry Street, Axeford Estate, Tatworth, South Chard and Chard Junction. We do come. The places above are just the closest neighbours, and a page is there for most towns around Somerset, so an absence from the list isn't an absence from our coverage. Phone and check rather than presuming — borders above all, and anywhere the satnav may struggle with. The map is the ground the page includes. Your vehicle does not need to travel to us. Our technicians work across the lot — roadside, forecourts, driveways, car parks. Shift the car out of the gateway and sort it out later — that is what somebody will say, and it is wrong. Parked on the zig-zags by Tatworth Primary School, a misfilled diesel Peugeot 308 is a nuisance and nothing worse. Restarted three more times for politeness, it's no longer a tank problem but a fuel system one, because priming occurs with every start and more petrol goes through your filter toward the pump. Let people grumble. Phone us. ## Coombses: broken down wherever you parked Not everybody has a safe place to pull in. Hazards going at a lay-by somewhere, or stopped on the verge beside Fore Street since you noticed after setting off — our technicians take that call so often that it's the normal kind. Fine where you are? Wait by it. Not safe? Climb out and away from it. Don't restart it to get to a nicer spot. It will go — a diesel on petrol generally obliges — and each mile of obliging draws the mixture deeper into the fuel system. We'll take our van to an awkward spot without any trouble, and for your car that is much better than driving on. Three replies determine much of the work: what was put in, roughly how much, and whether your engine has run since. We ask for those answers when we arrive at the car in the car park by Perry Street Club & Institute. After that the contaminated mixture comes out of your tank, your lines are cleaned, and where your Audi A4 has a replaceable filter, it comes off. After clean diesel is in and your system bled, our technicians fire it up and check it runs correctly before you drive away. ## Some miles on petrol in a diesel: what next? Here is where the M5 comes into it — under 15 miles from Coombses. A misfilled diesel will usually take you onto it and some distance along before anything seems wrong, while the signs when they appear are normally a drop in power, a rough idle and some smoke instead of a clean stop. The first safe exit is the one to take. Switch off there, and leave the restarting alone. It changes what our technicians bring, and so mention it when you ring: on a longer drive — anything approaching the under 50 miles to the nearest city — assume the mixture has been through the filter, your pump and the fuel injectors. ## Where's Coombses? Coombses is a suburban area in Somerset, situated inland at an elevation of around 65 metres. Coombses lies near the villages of Perry Street and Tatworth, and is close to the Axeford Estate. Coombses is characterized by its predominantly detached housing stock, and is home to a population of approximately 1301 residents. Coombses is located 27.1 miles from Exeter and 130.2 miles from London. ## The call-out around Coombses, step by step - Our engineers check what was put in, how much, and whether your motor has run. The replies change the work, which is why our technicians ask before giving a price. - The polluted mixture is pulled out of that tank. - Lines rinsed, filter cleaned. Whatever remains later on is not the thing that created the trouble. - New diesel goes in, and then your system gets bled. - The engine is fired up and tested to be sure it runs smoothly on clean diesel. At that point it is ready to set off. We do all of this wherever your car has come to a stop, which means it never has to be taken to a garage, and if it has been noticed early, it is very unusual for there to be permanent damage. Rarely the problem, the spot. On-street is the commonest place our technicians work, and a narrow parking space is far preferable to a vehicle that has been driven somewhere more convenient. What does help, when you phone from near WW2 Pill Box (Intact), is three things: the side the filler is on, whether a van can park alongside without blocking the road, and whether anything has run since you filled up. Then your Mercedes E-Class gets emptied, the fuel filter changed where a usable one exists, the fuel lines cleaned and clean fuel put through the whole circuit — as by now the worst of that is in the fuel lines, not that tank. ## A distinct matter: AdBlue in a diesel tank in Coombses The fault is not the same, though the first rule is — do not start it — if what went in was AdBlue instead of petrol. Petrol does two things to diesel: thins it, and takes away the lubrication the system depends on. Rust and deposits are what a diesel tank gets instead, as AdBlue is urea in water. Both are ours. There's a separate Coombses page for AdBlue removal, with the full story on it — including the reasons it frequently turns out to be the worse of the two. A vehicle you picked up two days ago gets driven further before anybody notices anything, which is the hire and courtesy issue in one sentence — and how far it went is what determines the amount of petrol arriving at the injectors. Nothing slapdash about the mistake itself: a current diesel filler neck takes the smaller petrol nozzle with practically no resistance, so strange places see most of these. Phone us from wherever you are, near WW2 Pillbox (Intact) or not, and we'll get to the BMW 1 Series. ## What a petrol-in-diesel drain costs in Coombses We cannot put one figure on this page frankly, as the job is not one job. What shifts it: - Started? Driven? Either answer counts more than anything else on this list. - Wrong fuel in, against what your tank takes — that proportion. - AdBlue or unleaded, whichever was put in. - Where is it? And can a van get to it and work there safely? The car, the quantity, whether it has run — give us those and the answer comes back straight rather than as a range. If it is not time-critical — the vehicle is at home and going nowhere — is fine too. By this point the tank is not where most of the trouble is. Once a diesel has run, that mix is in your filter, the fuel lines, the pump and its rail — and it does not come back out with that tank contents. A diesel Vauxhall Insignia that made it by Bethel Baptist needs the system purged, not emptied. ## Things our technicians hear about petrol in diesel in Coombses ## Can you do a fuel drain at a petrol station around Coombses? Yes — forecourts are where a large share of this takes place. Tell us which one you're at when you call and we'll tell you whether we can work there. With the owner's agreement we attend Texaco and the other forecourts nearby regularly. ## How much petrol in a diesel is too much? Litres aren't the measure. Ratio is, and far more than either, it counts whether anything has been run. Five litres into an almost dry tank is not five into a full one, no. But both land on the same question in the end: has that blend been pulled right through, or has it not? ## I drove the car after putting petrol in my diesel. Now what? Switch off somewhere safe, and keep it that way after you stop. Driving is what takes the problem from that tank into your pump and injectors — but it's fixable far more frequently than people assume, and the single most valuable thing you can do now is not restart it. ## Is a fuel drain going to void my warranty? No. Carried out correctly, emptying and rinsing is no change at all, and the warranty from your manufacturer is untouched by it. Another good reason to leave it switched off: running a diesel on petrol is the thing likelier to cause a dispute with one. ## Could I put some two-stroke in and just drive? Two-stroke oil solves a separate issue, and an old one at that. Nothing it does puts back what petrol diluted. No. Petrol remains in that tank afterwards, whatever else goes in, and your pump gets no respite from it. ## Do I need a main dealer for petrol in a diesel? There is no need to take it to a franchised dealer, since we drain and flush the car wherever it is. ## You, and the car, still together? Keep the engine turned off. Already driven it? Then pull in somewhere safe, switch off, then let it remain that way. A stationary, cold car is the best place to be in, and this is recoverable from a lot more frequently than motorists expect. Across Somerset and in Coombses: call-out fuel draining, at home or on the forecourt or at the roadside.