Put Petrol in a Diesel Car in Higher Bojewyan? Don't Start It
With your tank still carrying the petrol and the engine not yet started, nearly every job needs only a drain, so leave the engine off. That result is decided in the minutes right after filling up, rather than by the amount that got in. All over Higher Bojewyan and the remainder of Cornwall, Petrol in Diesel drains the vehicle and cleans it where it stands, whether by a roadside, on a private drive or at a forecourt. Contact us and our team can show you what happens next before you try much else.
Your first five steps: petrol in a diesel
- Never fire it up. Fired up all the same? Then do not rely on it. Diesel in a petrol vehicle normally can't run, so the driver stops and the harm stops with them. Petrol in a diesel? It starts. It ticks over. It pulls away fine, for a couple of miles. Motorists get that confused. It's not okay — that fuel system is wearing down every mile you do.
- Two things, diesel: it combusts, and on the way through it keeps that high-pressure fuel pump and injectors lubricated. Petrol only does the one. That is why the car's ignition remains off too — switch it on and you commonly prime your system, and that's petrol exiting your tank for just those components.
- Do not thin it. Diesel added on top takes out nothing, and so all you get is more of what was already there, since percentage is not how a diesel fuel system handles petrol. Super unleaded? Simply petrol. The grade makes no difference.
- A car that has not moved is the simplest one to deal with, so wait where you are if you sensibly can. Stopped on the verge on Ponds Hill? Hazards on, then keep the car there. An awkward spot suits us better than a started motor.
- Our van turning up instead of circling rests on two things: a postcode that starts TR19 7, and whatever is closest to you with a name on it. Keep both ready before you phone.
- Call 0333 366 0103. Prepare for three questions — what went in, roughly how much, plus if the car has been turned over. The responses settle all that comes after.
Phone us before you fetch the vehicle. Petrol into a diesel Renault Megane this morning, and the car outside Penzance ever since? Then the afternoon has taken nothing from you: fuel in a tank is dormant, and any harm happened on the drive in, when the pump was taking diesel that petrol had diluted.
A diesel pump delivers fuel to demand, and a frantic morning run needs plenty — so three miles in the Skoda Octavia sounds like nothing and is not. Twenty to nine outside Pendeen School, already late, the receipt in your hand saying unleaded: hazards on, ignition off, phone us.
It will start. It will drive off quite happily. That is the trouble, as a diesel on a thinned tank behaves normally while wearing the parts its fuel should be lubricating. So no, never risk the trip home from The North Inn — leave the BMW 3 Series then ring us.
Here is the full process. Diesel needs enough body to seal the close tolerances it goes through, and petrol takes that away. That's it. Which explains the ordinary Borlaze Park call — a diesel Nissan Qashqai, out there without fuss and back down on power, lumpy at idle, possibly a bit of smoke. Injection systems work hydraulically as well as chemically, so the fuel has to hold pressure and not just burn; thinned, it escapes past those tolerances instead of building, and delivery comes weaker, later, less even than the motor was built around. Not a failing motor, though. Fuel that has stopped behaving like diesel. Put that right and it stops.
No warning exists for this, which is why cars in that position usually get driven again before anybody phones. Don't be one of them. The throttle went limp and the idle turned uneven after a couple of streets, and your diesel Mercedes E-Class is now waiting near Chimney. Softness there means fuel that can't build pressure fully instead of a motor packing up. Switch off. Ring us.
Draining petrol from a diesel on the forecourt
A fair portion of the work ends up done at a forecourt, since that's where it often starts. Still at Trewellard Garage? Then that is generally where it happens. Station forecourts are routine for us, with the agreement of the station.
Before your engine has fired — the forecourt is the one place this gets stopped. The few seconds between seeing the till receipt and reaching for your key determine how much requires rinsing. Everywhere other than a forecourt — a car park, a drive, a lay-by — your car was switched on and moved to get there, so fuel was drawn from your tank, through the filter and into the high-pressure fuel pump. That means the lines and the filter require rinsing as well as your tank. It is not a calamity, and our engineers can still deal with it where your car is.
Away from the petrol pump, the next motorist can get through — so yes, let the staff help you roll the car. Well worth doing. Cranking the car over four vehicle lengths? Never.
Higher Bojewyan and the areas near it
Higher Bojewyan is a residential suburb, so our vans go out to it and to the places near it on those same trips: Portherras, Pendeen, Higher Boscaswell, Morvah and Lower Boscaswell.
Our technicians do come. The places above are merely the closest neighbours, and a page exists for most locations around Cornwall, and so an absence from the list is not an absence from the coverage. Near the boundary, or anywhere your phone gets wrong? Ring us to enquire instead of presuming.
This map marks the patch the page covers. Roadside, forecourt, driveway, car park: every bit of that is territory we work on, and none of that needs your vehicle to come to us.
Broken down by the kerbside in Higher Bojewyan
Some people have no sensible spot to stop whatsoever. Set off, then noticed? Landed by the verge of B3306, or parked in some lay-by with the hazards going? That is a routine call here. Not a rare one.
Whether you wait by the motor or step away from it depends on if staying nearby seems sensible. Don't fire up the engine to limp the vehicle somewhere better — a diesel running on petrol will usually oblige, and every mile it obliges for is dragging that mix further into your fuel system. Pressing on does your car far more harm than our van driving out to a tricky location, and that is no bother for us.
Driven it already? Stop, and read below
The local M5 is the one which matters here, and it lies over 50 miles from Higher Bojewyan. Some way along, and onto it in the first place: a misfuelled diesel will frequently manage both before anything seems wrong. What you get then is seldom a clean stop. Power drains away, your idle turns lumpy, and there may be some smoke.
The first safe junction is the one to take. Switch off there, and leave the restarting alone. On a longer trip — anything approaching the under 50 miles to the nearest city — take it the contamination has been through the fuel filter, your pump and the injectors, and say so when you ring. It changes what we bring.
Where is Higher Bojewyan?
Higher Bojewyan is a small suburban area in Cornwall, situated on the coast at an elevation of 132 metres, with views out to the Atlantic Ocean. Higher Bojewyan sits near the villages of Portherras and Pendeen, and is characterized by its predominantly terraced housing. Higher Bojewyan is located near the western tip of England, approximately 258 miles from London, and is within a short drive of the city of Truro. Higher Bojewyan has a population of around 604 residents.
Our call-out around Higher Bojewyan, step by step
- Our engineers ask first, price after. What got in? How much? Has the motor run? Those responses shape what the work really is.
- The contaminated fuel comes from your tank.
- What is remaining in the system should not be what caused the issue, and so the lines get cleaned and the filter cleaned.
- New diesel goes in, and then the fuel system gets bled.
- Our technicians fire it up and make sure it runs correctly on fresh diesel.
At that point it is ready to pull away. Lasting damage is very unusual when it has been caught soon, and since everything is done where the car is, it never needs to be taken to a garage.
Higher Bojewyan AdBlue removal is a separate matter
The issue is not the same, though the first instruction is — never start it — if what was put in was AdBlue rather than petrol. Petrol dilutes your diesel and takes away the lubrication the fuel system depends on. AdBlue? Urea dissolved in water. Pour that in with the diesel and you get rust instead, plus deposits.
Frequently the more significant of the two, AdBlue — and the detail lives on its own Higher Bojewyan page. Both are ours to handle.
How much is a petrol-in-diesel drain in Higher Bojewyan?
What moves the figure is listed below, as this job isn't one job and our engineers can't truthfully put a single figure on this page.
- This is the main one: whether the motor has been run, or driven.
- Wrong fuel in, against what your tank takes — that ratio.
- Which got in: petrol or AdBlue.
- Where the vehicle is, and if a van can safely get to and work on it.
The vehicle, the quantity, whether it has run — give us those and the answer comes back straight rather than as a range. Vehicle at home, going nowhere, nothing urgent about it — is fine for that.
Questions we hear about petrol in diesel in Higher Bojewyan
I'm on a forecourt in Higher Bojewyan. Can you drain it on the spot?
Yes — forecourts are where a big portion of this takes place. Tell us which one you're at when you ring and we'll tell you whether we can work there. With the station's agreement we attend another forecourt nearby and the other forecourts locally routinely.
Is there a sensible quantity of petrol in a diesel?
It rests on the proportion instead of the litres, and much more on whether the motor has run. Five litres into a nearly dry tank isn't five into a full one, no. But both land on the same query in the end: has that blend been sucked right through, or has it not?
Already driven it with petrol in the diesel? What then?
Stop safely. Off. Nothing after that. It's salvageable much more regularly than motorists fear, even though driving is what moves the problem from your tank into your pump and injectors — and the single most valuable thing you can do now is not restart it.
Is a fuel drain going to void my warranty?
It's not a modification, so a drain then flush carried out correctly does not invalidate a manufacturer's warranty. Another reason to leave it switched off: running a diesel on petrol is the thing likelier to cause a disagreement with one.
Can I just add two-stroke oil and drive home?
Two-stroke oil solves a different problem, and an old one at that. Nothing it does puts back what petrol diluted. No. Your pump still has to cope with it, since the tank still has petrol in it later.
Does petrol in a diesel have to go to a main dealer?
There is no need to take it to a dealership, as we drain and flush the car wherever it is.
Is the car still with you?
Never switch it back on.
If you have already driven the vehicle, pull in somewhere safe, switch it off then leave it off. Cold and stationary, a vehicle is in the best position available — and people fear this much more than the recovery rate warrants.
Throughout Cornwall and around Higher Bojewyan: on-site fuel draining, at home or on the forecourt or at the roadside.