Put Petrol in a Diesel Car in The Marsh?
Petrol in Diesel drains and cleans wrong-fuelled vehicles where they stand, on the forecourt, by the roadside or on a driveway, across The Marsh and the rest of Pembrokeshire. The first thing to do is not to fire up your engine. When the motor has not been started and the petrol is still in that tank, a drain is almost always all it needs, and the following few minutes determine that, not how much got in. Just one call our way is enough: our engineers will tell you what follows from here. Make it first.
What now? Petrol in a diesel, in order
- Don't crank it — and do not depend on it when it runs. Here is the part motorists get wrong about petrol in a diesel specifically. A petrol motor fed diesel usually just can't run, and so the motorist stops and the wear stops with them. A diesel filled with petrol normally starts, idles and drives off perfectly well for a few miles. It isn't fine. It is wearing out that fuel system as you drive.
- Leave the ignition off as well. Diesel performs two roles: it ignites, and before it burns it greases your high-pressure pump and its injectors. Petrol manages the first but not the second. Switching your ignition on is often enough to prime the system, which carries the petrol out of your tank then into just those components.
- Topping up clears nothing. It leaves you a bigger tank of the same mix, since a diesel fuel system does not accept petrol by percentage as that advice assumes — so don't put diesel on top to dilute it. Octane is beside the point too: super unleaded is petrol.
- Wait where you are if you sensibly can. A motor that has not shifted is the quickest one to handle, and we would rather come to an odd place than have it started. If you're pulled up on the verge on New Road, switch those hazards on and leave the car there.
- Keep your position prepared before you ring. A postcode that starts SA61 1 and whatever is closest to you with a label on it is the difference between a van turning up and a van circling.
- Phone 0333 366 0103. Expect three queries — what got in, approximately how much, and whether the motor has been run. Your replies shape all that comes after.
The drive in is what pulled thinned diesel through your pump. Sitting still has pushed nothing. Petrol in a diesel Volkswagen Passat, sitting at Haverfordwest all day, sits inert in the tank while it waits. Call us first — before the keys turn.
Car parks like the one at Aldi are somewhere our engineers work in often, and the fuel is rarely the complicated part. The bay is: motors either side, a trolley shelter behind, sometimes a height barrier on the way in that determines whether a van can reach you at all. So tell us how boxed in you are when you ring, and which way the vehicle is pointing. When our technicians cannot work next to the diesel BMW 3 Series we'll shift the car without starting it — and that isn't fussiness about a few seconds of running. Each start primes your fuel system and sucks more of that mix out of that tank and towards your pump, and so a motor shuffled twice into a nicer bay has silently turned into a bigger job than one left precisely where it stopped.
Don't chance it. The trip home from Milford Arms is quite possible, which is precisely the problem — a weakened tank does not stop a diesel starting or pulling away, it just wears the parts your fuel is meant to protect. Phone us, and let the Audi A4 stay where it stands.
Draining the Mercedes E-Class, changing your filter where there's a workable one, flushing your lines, putting clean fuel through the full circuit: that's the job, and it is shaped by the worst of that waiting in the lines rather than in the tank by this point. Three things help when you call from near Haverhub Community Centre — which side the filler is on, whether a van can pull up beside without blocking the road, and if the motor has run since you filled up. On-street is the most common place our technicians work, and so the spot itself is rarely the issue. A cramped parking space beats a vehicle driven somewhere more convenient.
What happens next is the trouble. The engine at once pulls the petrol left resting in the filter and the feed lines back round through the pump a second time, because draining a tank does nothing about fuel that has already left it. Drain it and put new diesel in, a person sure of themselves will tell you — and that advice is only half right, because do it to a diesel Citroen C3 parked up, Priordy Hwlffordd say, and the thing starts, which is what makes it sound plausible. Ring us instead. Our engineers flush your circuit and take your filter off where the car has a serviceable one, and that's the difference between the vehicle being put right and your car just starting.
Can petrol be pumped out of your diesel on a forecourt?
Pumps are where this work often starts, and where a good chunk of it ends. Still at Morrisons? Then that is generally where it takes place. Petrol station forecourts are routine for us, with the agreement of the owner.
Nowhere other than the forecourt can the mistake be stopped with the motor still unrun. The few seconds between reading your receipt and going for the keys determine how much needs rinsing. Everywhere other than the forecourt — a car park, a driveway, a lay-by — the vehicle was started and moved to get there, so fuel was sucked from that tank, through the filter and into your high-pressure pump. That means the lines and the filter need flushing as well as the tank. It's not a catastrophe, and our technicians can still put it right where the car sits.
The attendants will generally offer to roll it out from the petrol pump so the next driver can get by. That is worth doing. Cranking it to roll four vehicle lengths is not.
Parts our vans reach in The Marsh
The Marsh is a residential suburb, and so our team go out to it and to the villages by it on the usual rounds: Haverfordwest, Prendergast, Merlins Bridge, Albert Town and Uzmaston.
If yours isn't on the list it doesn't mean we do not come — there are separate pages for most towns in Pembrokeshire, and the ones mentioned above are merely the nearest neighbours. Contact us to enquire rather than guessing — county lines particularly, and wherever your satnav may misread.
The map shows the area the page includes. Every bit of that is territory we serve: a roadside, a forecourt, a drive, a car park. You never move your car anywhere.
Kerbside stops around The Marsh
Some people get no safe place to pull in whatsoever. If you worked it out after setting off and ended up on the verge beside Cambrian Place, or in a lay-by somewhere with the hazards going, that's a common call for us rather than an unusual one.
Remain by the car while it is sensible to sit inside, but out of it when it is not. Do not start up your engine to limp the vehicle somewhere better — a diesel running on petrol will frequently oblige, and every mile it obliges for is dragging that mixture further into the fuel system. However inconvenient the spot, it's no problem for us to get to it, and that's much better for your car than carrying on.
Already driven it? Petrol in a diesel after a couple of miles
This is where the M4 comes in — under 50 miles from The Marsh. Some way along, and onto it in the first place: a wrongly fuelled diesel will frequently do both before anything seems wrong. What you get then is seldom a neat stop. Power falls away, the idle turns uneven, and there may be smoke.
Don't start it to move it. Pull off at the next safe exit and switch off. It alters what we bring, and so say so when you phone: on a longer drive — anything close to the under 15 miles to the closest city — assume the contamination has been through the filter, the pump and the fuel injectors.
A little about The Marsh
The Marsh is a coastal suburban area in Pembrokeshire, situated near the city of St Davids and the towns of Haverfordwest and Prendergast. The Marsh lies at a low elevation of around 10 metres, close to the sea and within a short distance of several nearby beaches. The Marsh has a population of approximately 3475 people, living in predominantly detached housing.
What happens when we reach you around The Marsh
- The answers shape the work, which is why we ask before quoting: what got in, how much of it, and whether your engine has run.
- The polluted mixture is pulled from your tank.
- Our engineers purge the lines and clean the fuel filter, and so what's left in your system is not what started the trouble.
- The system gets primed, on fresh diesel.
- Our engineers fire it up and check it runs properly on fresh diesel.
That leaves it ready to set off. There is no need for a workshop at any point, since the work is all done where the car is, and when it's noticed early, lasting damage is very rare.
The Marsh AdBlue removal is a separate problem
If what was put in was AdBlue instead of petrol, the opening step is the same — do not start the car — yet the fault isn't. The lubrication a fuel system relies on gets stripped away by petrol, which weakens the diesel. AdBlue? Urea dissolved in water. Tip that in with your diesel and you get corrosion instead, plus residue.
Frequently the more significant of the two, AdBlue — and the full story sits on its own The Marsh page. Both are ours to deal with.
What a petrol-in-diesel drain costs in The Marsh
What moves the price is listed below, as the job isn't one job and our technicians can't frankly put a single figure on this page.
- Whether your motor has been run or driven. This is the key one.
- How much of the wrong fuel was put in, judged against how much the tank can hold.
- AdBlue or petrol, whichever went in.
- Access: the vehicle's position, and whether working on it there's safe for a van.
The vehicle, the amount, whether it has run — give us those and the answer comes back firm and not as a range. Car at home, going nowhere, nothing urgent about it — is good for that.
Petrol in diesel queries from The Marsh motorists
Fuel drains on a The Marsh petrol station forecourt
Yes, and it's where a large portion of this work takes place. Tell us which one you're at when you ring and we will tell you if our engineers can work there. With the owner's permission we attend Tesco and the other forecourts locally all the time.
How much petrol in a diesel is too much?
Litres aren't the yardstick. Proportion is, and far more than either, it matters if anything has been run. A nearly empty tank with five litres in it, against a full one with the same five: different situations, of course. Either way, the work required comes down to one thing, which is whether the fuel system has had that mixture sucked through it.
Already driven it with petrol in your diesel? What then?
Stop safely. Off. Nothing after that. Driving moves the trouble along — out of your tank, into the pump and injectors. People fear it a good deal more than the recovery rate warrants, mind. The one genuinely helpful thing left to you isn't restarting the car.
My warranty — does a fuel drain void it?
It is not a modification, and so a drain and flush carried out properly doesn't cancel a manufacturer's warranty. Running a diesel on petrol is the thing likelier to cause a dispute with one, which is another reason to leave the car switched off.
Two-stroke oil in that tank, and then home?
No. It belongs to a distinct problem from a different era, and petrol has diluted something no oil of that kind restores. The pump still has to live with it, because that tank still has petrol in it after that.
Do I need a main dealer for petrol in a diesel?
Wherever your car is, we drain and clean it there, so a visit to the main dealer doesn't come into it.
Is your car still with you?
Don't switch the car back on.
Turn it off somewhere sensible and keep it off, if you have already driven it. A stationary, cold car is the best position to be in, and this is recoverable from far more commonly than people fear.
Call-out fuel draining around The Marsh and throughout Pembrokeshire — at the roadside, on the forecourt or at home.