--- title: Petrol in a Diesel Car Monktonhall — Fuel Drain canonical: https://www.petrolinadieselcar.co.uk/petrol-in-diesel/monktonhall-east-lothian/ location: Monktonhall county: East Lothian latitude: 55.930300 longitude: -3.060850 service: Petrol in a Diesel Car updated: 2026-10-28 --- # Put Petrol in a Diesel Car in Monktonhall? With your tank still carrying the petrol and the engine not yet turned over, almost every job requires only a drain, so keep the engine off. That result is decided in the minutes immediately after filling up, and not by the amount that got in. All over Monktonhall and the rest of East Lothian, Petrol in Diesel drains the car and flushes it where it is, whether at a roadside, on a private drive or at a forecourt. A single call our way is plenty: we can show you what comes next. Do this first. ## Now what? Petrol in a diesel, step by step - As you drive, your pump and the fuel injectors wear. This is why you do not start it, and why you never trust it once it has started. The thing about petrol in a diesel in particular — the point people get wrong — is that it drives off normally for the first mile or two. Diesel in a petrol engine normally won't run at all, which stops the person and stops the damage with them. This one lets you carry on. - Leave the ignition off also. Diesel has two jobs: it burns, and before it combusts it protects your high-pressure pump and those injectors. Petrol does the first but not the second. Flicking the car's ignition on is usually sufficient to prime that system, which moves that petrol out of that tank then into exactly those components. - Don't pour diesel on top to dilute it. A diesel fuel system doesn't cope with petrol by percentage in the way that guidance implies, and topping up takes out nothing — it simply hands you a fuller tank of the same mix. The type makes no difference either: super unleaded is just petrol. - Stay put if it is wise to. Hazards on, motor off, keep the vehicle. Wherever you have stopped — the verge on B6415, anywhere — a tricky place for us is better than a started diesel, and nothing is easier for us to deal with than a vehicle that never moved. - Know where you are before phoning. A postcode that starts EH21 6, and the name of whatever is next to you. Otherwise the van circles instead of showing up. - Dial 0333 366 0103. Expect three things — what got in, approximately how much, and if the car has been started. The replies shape all that follows. The run in is what drew weakened diesel through your pump. Sitting still has pushed nothing. Petrol in a diesel Volkswagen Golf, parked at Musselburgh all day, sits dormant in that tank while it waits. Phone first — before your keys come out. ## Can petrol be drained from your diesel at the forecourt? Much of the work begins at a forecourt, which means a large part of it is completed at one. We work on garage forecourts all the time, with the site's consent, so if you're still at BP that's generally where the drain takes place. At the forecourt, this is caught with your engine never started, and no place else manages that. The few seconds between checking the till receipt and going for the key settle how much requires rinsing. Everywhere other than the forecourt — a car park, a driveway, a lay-by — the car was started and moved to get there, so fuel was sucked from the tank, through the filter then into your high-pressure pump. That means the lines and the fuel filter require rinsing as well as your tank. It is not a calamity, and we can still put it right where the car sits. Attendants will generally chip in pushing it away from the pump, which lets the next driver get past. Take the offer. Cranking it just to move four vehicle lengths isn't. If you have put petrol in your diesel Skoda Octavia in Monktonhall and you are now stuck outside Tesco Extra with a boot packed with shopping, phone us. Don't fire it up a second time to get out of the spot. We will head your way, empty your tank, purge those fuel lines and put new diesel in so you can drive home. A mile or so at gentle throttle uses hardly any fuel, so those are usually the simple jobs. ## Can our engineers reach your corner of Monktonhall? Monktonhall is a residential suburb, and so our vans head out to it and to the villages around it on the usual trips: Stoneybank, Whitehill, Old Craighall, Stoneyhill Steading and Inveresk. If yours is not on that list that does not mean we do not come — there are pages for the majority of locations in East Lothian, and the ones listed above are simply the nearest neighbours. Close to a boundary, or somewhere a satnav misreads? Phone and check rather than guessing. The ground this page covers appears on the map. Our technicians work at the roadside, at forecourts, on driveways and at car parks over all of it, and your car doesn't need to come to us. ## Stranded on the roadside somewhere in Monktonhall? Some drivers have no sensible spot to pull over whatsoever. Set off, then realised? Ended up along the verge of Ferguson Drive, or parked in some lay-by with your hazards going? That is a routine call here. Not an unusual one. Stay with the vehicle if it's sensible to be inside, yet clear of it if it is not. Don't start it up to get to a nicer place. It'll go — a diesel on petrol usually obliges — and each mile of obliging drags that mix deeper into the fuel system. A technician driving to a difficult place is no bother for us, and it's a lot better for the car than driving on. ## Driven it already? Pull in, then check this This is where your M8 counts, under 10 miles away from Monktonhall. It will usually get you onto it, and some way along, before you notice a thing. Then it's smoke, a rough idle and power falling away — not a clean stop. Misfuelled diesels seldom give you one of those. The next sensible exit is the one to take. Turn off there, and leave the restarting alone. It affects what our technicians bring, so tell us when you call: on a longer drive — anything approaching the under 10 miles to the nearest city — assume the mixture has been through the fuel filter, the pump and your injectors. ## A little about Monktonhall Monktonhall is a suburban area in East Lothian, situated near the coast and approximately 5 miles from Edinburgh. Monktonhall has a relatively low elevation of 22 metres and is characterized by semi-detached housing. Monktonhall is close to other nearby places such as Stoneybank and Whitehill, and is part of the wider Edinburgh urban area. Monktonhall is located a significant distance from London, at around 328 miles away. ## The job around Monktonhall, step by step - Three things get asked before any quote — the fuel that was put in, the quantity, and whether anything has been run since. Each answer changes the work. - We empty the tank of the polluted mixture. - Our technicians rinse your fuel lines and clean the fuel filter, so what's left in the fuel system isn't what caused the problem. - Fresh diesel goes in, and then the fuel system gets bled. - When it's turned on, our technicians confirm it runs properly on new diesel. The car is then ready for you to pull away. Lasting damage is very rare when it has been spotted quickly, and as everything is done where the car is, it never has to go to a garage. Phoning from near War Memorial? Three things help us. The filler — which side of the car it's on. Room for our van alongside you, without the road being blocked. And whether anything has run since the fill-up. The place itself scarcely matters: on-street is where we work most, and we'd much rather have a cramped spot than a motor a person has driven somewhere easier. Then it is a drain for the Peugeot 208, a filter change where there is one worth changing, lines flushed, fresh fuel put round the entire circuit. By now the worst of it is in your lines and not your tank. ## Monktonhall AdBlue removal is a distinct matter AdBlue instead of petrol? Then the opening step is unchanged — the motor stays off — while this issue beneath it's a distinct one altogether. Diluted diesel, and no lubrication left for the fuel system that depends on it. That's petrol. AdBlue is urea dissolved in water, and in a diesel tank it leads to rust and build-up in its place. AdBlue removal in Monktonhall has a page of its own with the detail on it, including why it is often the more serious of the two. We deal with both. Petrol in a diesel does its harm as a share, which is the reason our technicians ask at all: the same few litres sitting in a nearly empty tank make a far stronger mix than they would in a full one. And petrol is rated on how well it withstands igniting under pressure — the opposite of what a diesel needs — so a stronger blend rattles more, smokes more, goes flatter. None of which means you need an answer ready. Nearly nobody knows how full that tank was in a motor collected two days ago, and our technicians work that out there. Do phone the hire or company firm first, though: some contracts want them to authorise the work, and that is far quicker settled before than after. Then ring us about the Citroen C3 by St Michael's Kirk Inveresk. ## What a petrol-in-diesel drain will cost around Monktonhall Frankly, no single figure belongs on a page like this. This job varies. Here is what changes it: - Started? Driven? Either answer counts more than anything else on this list. - The tank's capacity, set against how much of the wrong fuel got into it. - AdBlue or unleaded, whichever went in. - Where is it? And can our van reach it and work there safely? Tell us the car, the amount and whether it has run, and you will get a firm answer rather than a range. Not time-critical, with the vehicle at home and going nowhere? Then does this job. No dashboard light exists for this, which is why cars in that position typically get driven a second time before anyone rings. Please don't be one of them. The throttle went dead and the idle turned uneven after a couple of streets, and your diesel Kia Sportage is now sitting near Stoneyfarm Community Centre. Deadness there means fuel that cannot build pressure correctly rather than a motor giving up. Turn off. Phone us. ## Petrol in diesel: common queries in Monktonhall ## Can you do a fuel drain at a petrol station around Monktonhall? Much of what our engineers do takes place nowhere else. So yes. Tell us which one you are at when you ring and we will tell you if our technicians can work there. With the owner's agreement our engineers visit Tesco and the other forecourts locally all the time. ## How much petrol is too much for a diesel? Litres aren't the yardstick. Proportion is, and much more than either, it matters if 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 mix been sucked right through, or has it not? ## I put petrol in my diesel and drove the vehicle. What next? Turn off somewhere safe, and keep it that way after you stop. Driving is what moves the issue from your tank into the pump and injectors — but it is recoverable much more commonly than drivers fear, and the single most helpful thing you can do now isn't restart it. ## Will a fuel drain void my warranty? It is not a modification, so a drain then flush carried out properly doesn't invalidate a manufacturer's warranty. Running a diesel on petrol is the thing likelier to cause a disagreement with one, which is another good reason to leave the vehicle turned off. ## Can I just add two-stroke oil and drive home? What petrol has thinned is not put back by two-stroke oil, which is an old workaround for a distinct issue. So no. Later on? Still petrol in the tank, and a pump that has to put up with the stuff. ## Does petrol in a diesel have to go to a main dealer? Not at all. We drain and clean your car wherever it is, so there's no need to bring it to a dealership. ## You, and the car, still together? Don't turn the engine back on. If you have already driven the car, pull over somewhere sensible, switch it off and leave it off. A stationary, cold motor is the best position to be in, and this is recoverable from a lot more commonly than motorists assume. At the roadside, on the forecourt or at home — on-site fuel draining around Monktonhall and throughout East Lothian.