Put Petrol in a Diesel Car in Lower Trewellard? Don't Start It
Do not fire up the motor. If the petrol is still in your tank and your engine has not been started, a drain is almost always all it needs — and that's decided in the following few minutes, not by how much was put in. Petrol in Diesel drains and cleans wrong-fuelled vehicles where they are, all over Lower Trewellard and the remainder of Cornwall, on the forecourt, at the roadside or on a private drive. Our engineers can show you what the next move is. Call us — it goes ahead of everything else.
Petrol in a diesel: what to do next
- Don't crank it — and don't believe it if it does start. This is the thing most people have wrong about petrol in a diesel especially. A petrol engine given diesel typically just cannot run, and so the driver stops and the harm stops with them. A diesel given petrol generally starts, ticks over and drives off perfectly well for a couple of miles. It isn't all right. It is wearing your fuel system as you drive.
- Leave your ignition alone too. Diesel does two jobs: it burns, and before it ignites it greases that injection pump and the injectors. Petrol handles the first but not the second. Turning your ignition on is commonly enough to prime your system, which draws the petrol out of that tank then into precisely those parts.
- Do not weaken it. Diesel put on top gets rid of nothing, and so all you get is more of what was already there, because percentage isn't how a diesel fuel system accepts petrol. Super unleaded? Just petrol. The type makes no difference.
- A motor that has not moved is the quickest one to sort out, and so wait where you are if you safely can. Pulled up on the verge on B3306? Hazards on, then leave it there. A tricky location works for us better than a started engine.
- Find out where you are before phoning. A postcode that starts TR19 7, and the name of whatever is nearest to you. Otherwise the van circles instead of turning up.
- Call 0333 366 0103. Anticipate three queries — what was put in, approximately how much, and whether the motor has been turned over. Those responses determine everything that comes after.
Can petrol be taken out of a diesel at the forecourt?
A fair portion of this work ends up done at a forecourt, since that's where it mostly starts. If you are still on the forecourt at Trewellard Garage, that's normally where the drain takes place — we work on petrol station forecourts routinely, with the station's consent.
Before your motor has started — a forecourt is the only place the mistake is stopped. Anywhere else — a car park, a private drive, a lay-by — the vehicle was started and moved to get there, which means fuel was sucked from the tank, through the fuel filter then into the high-pressure fuel pump. That is not a disaster, and our engineers can still put it right where it sits. It does mean your lines and the fuel filter need rinsing as well as that tank, and that is decided by the few seconds between seeing the receipt and going for the key.
Roll the car out of the way if the staff volunteer, and they usually will. The next motorist gets by the pump, and that is worth doing. Shifting it four lengths does not merit starting it.
Tell us this much and our technicians can work with it: a diesel BMW 3 Series, a couple of litres of unleaded in it, two miles or so, turned off at Co-op Food now. Time gone by isn't the thing our engineers need. Fuel pulled by your pump is.
Your diesel Nissan Qashqai will have felt perfectly usual on the way back from Pendeen School. They all do, and that's the catch with petrol in a diesel rather than the other way round. Put diesel in a petrol vehicle and it generally will not run, and so the person stops and the damage stops with them. Put petrol in a diesel and it fires up, idles and pulls away as though nothing has happened — all the while the high-pressure pump works without the protection your fuel is supposed to be supplying. Nothing alerts you, since from the driver's seat there's nothing to warn you about. Phone us with roughly how far you went and how hard you worked it; the second one matters more than the first.
Calling from close to Higher Bal Engine and Boiler House? Three things help us. The filler — which side of the vehicle it's on. Room for a van beside you, without the road being blocked. And if anything has run since the fill-up. The spot itself scarcely counts: on-street is where we work most, and we'd much rather have a tight spot than a vehicle a person has driven somewhere quicker. Then it's a drain for the Peugeot 3008, a filter change where there is one worth changing, lines rinsed, fresh fuel put round the entire circuit. By now the worst of it is in the fuel lines and not the tank.
New spots are where this happens most, and the reason is mechanical not sloppy: the smaller petrol nozzle slides into a modern diesel filler neck with practically no resistance at all. Filled up by Geevor Tin Mine without thinking, in a diesel Mercedes E-Class you have had for two days? Call us where you are. Hire and courtesy cars usually get driven further before anyone realises, and distance is what decides how much petrol reaches your injectors.
Drain it then put fresh diesel in — that is the advice you'll get, generally from somebody confident, and it's half true. Do precisely that to a diesel Vauxhall Astra near Hard Rock Museum and it would start, which is what makes the suggestion sound reasonable. What occurs next is the issue: the engine at once sucks the petrol left sitting in the fuel filter and the feed lines straight back through your pump, because emptying a tank does nothing about fuel that has already left it. Call us instead. We flush the circuit and take the filter off where the vehicle has a workable one, which is the difference between your car being put right and your car merely starting.
Lower Trewellard and the places next to it
Being a residential suburb, Lower Trewellard has a frequent call, and the villages close by come along on that same journey: Trewellard and Carnyorth, Lower Boscaswell and Higher Boscaswell, Pendeen.
Not on this list? That means nothing. The places above are only the nearest few, and the majority of towns across Cornwall have a page of their own elsewhere on our site. Near the boundary, or anywhere your satnav gets wrong? Ring us to check instead of guessing.
This map is the area the page spans. The car doesn't need to travel to us. Our technicians work throughout every bit of that — kerbside, forecourts, driveways, car parks.
Kerbside call-outs around Lower Trewellard
Not everyone gets a chance to pull over somewhere suitable. Set off, then twigged? Finished up along the verge beside Trewellard Road, or parked in some lay-by with the hazard lights flashing? That is a common call here. Not an odd one.
Sit by the vehicle when it's wise to sit there, yet clear of the car when it's not. Never start it up to get to a safer spot. It'll go — a diesel on petrol usually obliges — and each mile of obliging drags that blend deeper into the fuel system. We'll bring the van to a difficult place without any bother, and for your car that's a lot better than pressing on.
Petrol in a diesel, but the car has travelled
The M5 is the road which counts here, and it runs over 50 miles from Lower Trewellard. Some way along, and onto it in the first place: a misfilled diesel will usually manage both before anything seems wrong. What you get then is rarely a clean stop. Power falls away, the idle turns uneven, and there may be some smoke.
The first safe exit is the one to take. Switch off there, then leave the restarting alone. It changes what our engineers bring, so mention it when you phone: on a longer run — anything close to the under 50 miles to the closest city — assume the contamination has been through the fuel filter, your pump and your injectors.
Lower Trewellard itself
Lower Trewellard is a small suburban area situated on the coast of Cornwall, with its terraced housing characteristic of the region's traditional architecture. Lower Trewellard sits at an elevation of 124 metres, overlooking the surrounding landscape and out to sea. Lower Trewellard is located near the villages of Trewellard and Carnyorth, and is within commuting distance of Truro, the nearest city. Lower Trewellard has a population of around 515 people, making it a small but distinct community.
When our technicians get to you in Lower Trewellard: what follows
- The responses shape the work, which is why our technicians ask before pricing: what was put in, how much of it, and whether your engine has run.
- Out goes the contaminated mixture.
- Fuel lines are flushed through and the fuel filter cleared, leaving nothing in the fuel system that started any of this.
- The system gets primed, on fresh diesel.
- After it is started, our technicians confirm it runs properly on clean diesel.
After that it's ready to pull away. Permanent damage is very unusual when it has been noticed quickly, and because everything is done where your car is, it never has to be taken to a garage.
Lower Trewellard AdBlue removal is a distinct problem
The issue is not the same, though the opening rule is — don't start it — if what went in was AdBlue instead of petrol. The protection a fuel system relies on is taken away by petrol, which thins your diesel. AdBlue? Urea dissolved in water. Put that in with the diesel and you get rust instead, plus residue.
We cover both, and AdBlue removal around Lower Trewellard has its own page with the full story — including why it's frequently the more significant of the two.
Lower Trewellard prices for a petrol-in-diesel fuel drain
What changes the figure is laid out below, because the job isn't one job and our technicians can't frankly put a single price on this page.
- Whether the engine has been started or driven. This is the main one.
- How much of the wrong fuel went in, set against how much your tank takes.
- Whether it's petrol or AdBlue.
- Access: the vehicle's position, and if working on it there's safe for a technician.
A straight answer instead of a range is what you get for telling us three things: your vehicle, the amount, and if it has run. If it's not time-critical — the car is at home and going nowhere — works too.
Petrol in diesel: common queries around Lower Trewellard
Fuel drains on a Lower Trewellard petrol station forecourt
A good portion of this work takes place there, so yes. Our technicians attend another forecourt nearby and the other forecourts around town routinely, with the station's consent — tell us which one you're at when you call and we will tell you whether we can work there.
How much petrol in a diesel is too much?
Ratio settles it rather than litres — and more than either, whether your motor has run. Five litres into an almost dry tank is not five into a full one, no. But both land on the same query in the end: has that blend been drawn right through, or has it not?
Petrol in my diesel, and I have driven the vehicle
Switch off somewhere safe, and keep it that way after you stop. It's fixable far more regularly than drivers expect, even though driving is what moves the problem from that tank into the pump and injectors — and the single most valuable thing you can do now isn't restart it.
Will a fuel drain void my warranty?
A drain then flush carried out correctly is not an alteration and doesn't void a manufacturer's warranty. Another good reason to leave it switched off: running a diesel on petrol is the thing more likely to cause an argument with one.
Could I put some two-stroke in and just drive?
What petrol has thinned is not restored by two-stroke oil, which is an old fix for a different problem. So no. That tank still has petrol in it later, and your pump still has to live with it.
Do I need a main dealer for petrol in a diesel?
No. We drain and clean the car wherever it is, so there's no need to bring it to a main dealer.
Is the car still with you?
The motor stays off.
Driven it already? Then somewhere sensible, stop, switch off, and no restarting the vehicle later on. This is recoverable from a lot more commonly than motorists fear, and a stationary, cold car is the best place to be in.
Mobile fuel draining around Lower Trewellard and across Cornwall — at the kerbside, on the forecourt or at home.