St Erth: Put Petrol in a Diesel Car?
Petrol in Diesel drains and flushes misfuelled cars where they sit, on the forecourt, by the roadside or on a private drive, all over St Erth and the remainder of Cornwall. The first thing to do is not to fire up the engine. When your engine has not run and the petrol is still inside the tank, a fuel drain is nearly always all it requires, and the following few minutes decide that, not how much went in. Ring us and then we shall tell you what comes after that before you attempt any more.
What next? Petrol in a diesel, in order
- Don't start the car — and don't trust it when it does start. That is the thing drivers have wrong about petrol in a diesel especially. A petrol engine fed diesel normally just can't run, and so the driver stops and the damage halts with them. A diesel fed petrol usually starts, ticks over and drives away just fine for a couple of miles. It's not fine. It's wearing the fuel system whenever you drive.
- Leave your ignition be also. Diesel does two jobs: it burns, and before it burns it protects that injection pump and those injectors. Petrol handles the first but not the second. Turning your ignition on is frequently all it takes to prime your system, which carries that petrol out of that tank and into just those parts.
- Don't weaken it. Diesel poured on top removes nothing, so all you get is more of what was already there, because percentage isn't how a diesel fuel system handles petrol. Super unleaded? Still petrol. The type makes no difference.
- Sit tight if it's sensible to. Hazards on, motor off, keep it. Wherever you have stopped — the verge on School Lane, anywhere — a difficult location for us trumps a started engine, and nothing is simpler for us to handle than a car that never shifted.
- Before you dial, have your location. Anything closest to you with a name on it, plus a postcode that starts TR27 6 — that is what settles whether our van shows up or circles.
- Dial 0333 366 0103. Let us know what got in, roughly how many litres, and also whether the engine has run. These three details decide the entire call-out.
Quarter past eight. A rushed refuel on the way in. Close to eleven it hits you, and by then your diesel Skoda Octavia has sat at the nearest station for three hours. Phone us then leave it where it stands. What matters is the run in, as diesel both ignites and — before that — lubricates your pump and your injectors, while petrol only ever ignites. Those couple of miles ran the pump on a liquid robbed of most of its protection, and no volume of standing in a car park adds any of it back. Hence the question about distance rather than hours standing, and hence the advice to leave your keys where they are till our technicians get there.
How much fuel the pump has sucked is what we're truly asking — not how long ago any of that was. So the phone call our engineers hope for sounds like this: diesel BMW 3 Series, a couple of litres of unleaded, a couple of miles covered, now shut off at Asda.
What we'll ask is whether that trip there was brief and chilly, since that's where petrol is slowest to burn fully — and anything that doesn't burn can work past the rings then into the sump. Right up to the moment somebody drives it home, a diesel Ford Kuga sitting in the parking area outside Star Inn carrying a tank of petrol in it is a straightforward job. Nothing deteriorates whilst it waits, so park it overnight then call us next morning.
Authorisation first, where there's a hire firm or a company behind the vehicle — some contracts insist on it, and settling that beforehand saves a great deal of time later. After that, ring us about the diesel Audi Q5 close to a street just off the centre. You'll not know how full the tank was. Hardly anyone does, two days into a vehicle, and it gets worked out on site anyway. We ask since the damage petrol does in a diesel is proportional: a couple of litres in an almost empty tank make a much stronger blend than the same few in a full one, and since petrol is designed to resist igniting under pressure, which is precisely what a diesel relies on, the stronger it gets the more your engine knocks and smokes and flattens off.
Drain it and put clean diesel in — that's the tip you'll get, typically from a person confident, and it's only half right. Do exactly that to a diesel Renault Captur close to Kingdom Hall of Jehovahs Witnesses and it would start, which is what makes the advice sound plausible. What happens next is the trouble: your engine straight away draws the petrol left sitting in the fuel filter and the feed lines straight back through the pump, since emptying a tank does nothing about fuel that has already left it. Call us instead. Our engineers flush your circuit and take the filter off where the vehicle has a working one, which is the difference between your car being repaired and the car simply starting.
Clearing petrol from a diesel on a forecourt
Pumps are where the job mostly starts, and where a good portion of it closes. We operate on petrol station forecourts routinely, with the site's agreement, and so if you are still at the nearest petrol station that's normally where the drain takes place.
Nowhere but the forecourt can the mistake be caught with the motor still unstarted. Our technicians can still deal with it where it is, even away from the forecourt. In a car park, on a driveway or in a lay-by, the vehicle has been fired up and moved there, and that drew fuel through the filter and into your high-pressure pump, all the way from that tank. None of that is a catastrophe, though the flush then has to go past the tank to the lines and your filter, and the few seconds between seeing the till receipt and reaching for the keys are what determine that.
Away from the petrol pump, the next driver can get through — so yes, let the attendants help you wheel it. Well worth doing. Four car lengths is not worth a start.
Areas our team serve in St Erth
Those same runs bring us to Chenhalls, Trelissick, Rose-an-Grouse, Griggs and Canons Town as well as St Erth, which is a coastal village.
There are separate pages for most places in Cornwall, and the ones listed above are simply the immediate neighbours — so yours being absent from the list means nothing whatsoever about whether our technicians come. Presuming is the thing to resist, especially on a border or anywhere a satnav gets lost. Phone to check.
The map is the ground the page covers. We operate at the roadside, on forecourts, on driveways and in car parks across all of it, and your car does not need to come to us.
Stranded at the kerbside anywhere around St Erth?
Not everyone has a decent spot to pull in. If you realised after setting off and ended up on the verge of Church Street, or in a lay-by somewhere with the hazard lights on, that's a routine call for us and not a rare one.
Remain with the car while it is safe to wait there, and out of it when it's not. Don't start up the engine to nurse it somewhere handier — a diesel running on petrol will usually oblige, and every mile it obliges for is drawing that mix further into the fuel system. We'll bring our van to a difficult location without any bother, and for the vehicle that's far better than carrying on.
Driven it already? Pull in, and read below
Your M5 is the one which matters now, and runs over 50 miles from St Erth. Some way along, and onto it in the first place: a misfuelled diesel will often manage both before anything feels wrong. What you get then is seldom a clean stop. Power ebbs away, the idle goes uneven, and there may be some smoke.
Get off at the next sensible junction, turn off, and do not restart the vehicle to reposition. It alters what our technicians bring, so mention it when you phone: on a longer run — anything near the under 25 miles to the nearest city — assume the mixture has been through the fuel filter, the pump and the injectors.
About St Erth
St Erth is a small coastal village in Cornwall, situated near the mouth of the River Hayle and close to the beaches of St Ives Bay. St Erth sits at a low elevation of around 15 metres, with its terraced housing reflecting the village's historic development. St Erth is surrounded by nearby places such as Chenhalls, Trelissick, and Rose-an-Grouse, and is approximately 18 miles from the city of Truro. St Erth has a population of around 869 residents, who enjoy the village's scenic coastal setting.
What our technicians do when we reach you in St Erth
- Our technicians find out what was put in, how much, and if your engine has run. The answers change the work, which is why our technicians ask before quoting.
- Our engineers empty your tank of all the polluted fuel.
- Fuel lines are cleaned through and the filter cleaned, leaving nothing in your system that caused any of this.
- New diesel goes in, and then the system gets bled.
- The engine is started and tested to make sure it runs smoothly on new diesel.
From that point, you are ready to set off. There is no need for a garage at any point, because the work is all done where the vehicle is, and when it's caught early, permanent damage is very uncommon.
AdBlue in a diesel tank in St Erth is a different problem
If what got in was AdBlue instead of petrol, the opening instruction is unchanged — don't start the car — yet this fault isn't. The lubrication a fuel system depends on is taken away by petrol, which dilutes the diesel. Rust and residue are what a diesel tank ends up with instead, because AdBlue is urea dissolved in water.
Our engineers handle both, and AdBlue removal in St Erth has its own page with the detail — including why it's usually the more significant of the two.
St Erth prices for a petrol-in-diesel fuel drain
What shifts the figure is laid out below, since this job isn't one job and we can't honestly put a single number on this page.
- This is the main one: whether your motor has been run, or driven.
- How much of the wrong fuel went in, weighed against how much your tank takes.
- Whether it was unleaded or AdBlue.
- Access: the car's position, and whether working on it there's sensible for a van.
The vehicle, the amount, whether it has run — give us those and the answer comes back firm instead of as a range. Not time-critical, with the car at home and going nowhere? Then works.
Petrol in diesel queries from St Erth motorists
Can you do a fuel drain at a petrol station in St Erth?
Yes, and it is where a good portion of this work gets done. Tell us which one you are at when you call and we'll tell you if we can work there. With the site's agreement our technicians visit Texaco and the other forecourts around town all the time.
A couple of litres of petrol in a diesel — too much?
Litres aren't the yardstick. Ratio is, and a lot 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 mixture been pulled right through, or has it not?
I put petrol in my diesel and drove the vehicle. Now what?
Switch off somewhere sensible, and keep it that way after you stop. Driving takes the trouble along — out of that tank, into your pump and injectors. Drivers fear it a good deal more than the recovery rate warrants, mind. The one genuinely helpful thing left to you is not restarting it.
My warranty — does a fuel drain void it?
A manufacturer's warranty outlasts a drain and flush done to a proper standard, which is no alteration at all. Another reason to leave it turned off: running a diesel on petrol is the thing likelier to cause a disagreement with one.
Adding two-stroke oil, then driving home
No. Two-stroke oil is an old fix for a different problem and it doesn't put back what petrol has diluted. That tank still has petrol in it later, and the pump still has to cope with it.
A main dealer for petrol in a diesel — essential?
There is no need to take it to a franchised dealer, as our technicians drain and clean the car wherever it is.
You, and your vehicle, still together?
Switched off is the way the car remains.
If you have already driven it, pull in somewhere safe, switch it off and keep it off. A stationary, cold vehicle is the best place to be in, and this is recoverable from a lot more frequently than people fear.
Throughout Cornwall and around St Erth: on-site fuel draining, at home or on the forecourt or at the roadside.