Put Petrol in a Diesel Car in Rumblingwell? Don't Start It
Don't turn on your engine. While the petrol is still sitting in the tank and the engine has not turned over, a tank drain is nearly always all it requires — and that is decided in the next few minutes, not by how much got in. Petrol in Diesel drains and flushes misfuelled vehicles where they are, all over Rumblingwell and the rest of Fife, on the forecourt, by the roadside or on a drive. Our engineers shall explain what your next move is. Ring us — it happens before anything else.
What to do next about petrol in a diesel
- Give a petrol motor diesel and it will typically refuse to run at all, so the motorist stops there and so does the wear. Give a diesel petrol and the engine starts, it idles, it drives off — fine enough for several miles. Drivers have that backwards, which is the bit they get wrong about petrol in a diesel in particular. So never crank it. And having started, do not depend on it: the fuel system is grinding as you drive.
- Diesel ignites, and before it combusts it greases — your high-pressure fuel pump, those injectors. Petrol manages only the burning. So leave the car's ignition off too: turning it on is often all it takes to prime the system, and priming pulls petrol from your tank into exactly those parts.
- That guidance presumes a diesel fuel system handles petrol by percentage. It will not. Pour diesel on top and nothing at all is removed; what you get is a fuller tank of the same mixture. And no, the type makes no difference — super unleaded is still petrol.
- Stay still if it's safe to. Hazards on, engine off, keep it. Wherever you have stopped — the verge on Whitemyre Court, anywhere — an awkward location for us beats a started motor, and nothing is quicker for us to deal with than a vehicle that never shifted.
- Find out where you are before ringing. A postcode beginning KY12 9, and the name of whatever is next to you. Otherwise our van circles rather than arriving.
- Three answers settle the full job: the fuel you put in, the rough volume of it, and whether anything has been running since. Our number is 0333 366 0103.
On the forecourt: clearing petrol from your diesel
A fair part of this work is done at a forecourt, because that's where it usually begins. The drain normally happens on the spot. Still on the forecourt at Tesco? Given the owner's permission, that is a spot our engineers work, and regularly.
A filling station is the one setting it is halted before the engine has fired. Anywhere else — a car park, a drive, a lay-by — the vehicle was switched on and moved to get there, which means fuel was pulled from your tank, through the fuel filter then into the high-pressure pump. That is not a disaster, and our technicians can still deal with it where it stands. It does mean the lines and the fuel filter need rinsing as well as your tank, and that is determined by the few seconds between checking your receipt and reaching for the key.
Move the vehicle out of the way if the staff volunteer, and they usually will. The next motorist gets past the pump, and that's worth doing. Starting the car just for four vehicle lengths? Never.
Do our technicians cover your corner of Rumblingwell?
These same journeys take us to Baldridgeburn, Parkneuk, Beveridgewell, Castleblair Park and Milesmark as well as Rumblingwell, which is a residential suburb.
Our technicians do come. Those places above are only the nearest neighbours, and a page is there for the majority of places across Fife, so an absence from the list isn't an absence from our coverage. Assuming is the mistake to avoid, above all on a border or anywhere a satnav gets lost. Call us and check.
Look at our map for the patch shown on this page. Roadside, forecourt, driveway, car park: every bit of it is territory our technicians cover, and none of it needs your car to come to us.
A diesel pump delivers fuel on demand, and a rushed morning drive demands plenty — so three miles in your Mercedes C-Class seems like nothing and is not. Twenty to nine by the local primary school, already late, the receipt in your hand reading unleaded: hazards on, engine off, ring us.
Here's what a job in the car park at The Rumblingwell generally looks like. We reach the vehicle, ask what went in, roughly how much, and whether the engine has run since — these three replies settle most of the work. Then the polluted blend comes out of your tank, the fuel lines get rinsed, and the filter comes off where your Peugeot 3008 has a serviceable one. Fresh diesel goes in and your system is primed. Then our technicians fire it up, check it runs properly, and you set off.
A diesel injection system works hydraulically as well as chemically: your fuel has to hold pressure, not merely burn. Dilute that fuel and pressure which should build and stay built escapes past gaps instead, leaving the motor a poorer, later, less even delivery than it was engineered round. Petrol weakens diesel, and diesel has to be viscous enough to seal the tightly fitted components it passes through — that's the whole mechanism. It explains the normal Bull Park call too: a diesel Vauxhall Astra that travelled out without complaint and came back down on power, uneven at idle, possibly smoking a little. None of which is the motor failing, and that's the part worth hearing. The fuel has stopped behaving like diesel. Put the fuel right and it stops.
A throttle gone dead, white smoke, an uneven idle, knocking: that is a misfuelled diesel Citroen C3 telling you what's wrong. Do not start the car to find a better location — switch off where you have stopped, near The Limelight Studio or anywhere else.
That softness is the fuel failing to build pressure fully, not the engine failing — and with no warning light for it, vehicles in that position typically get driven again before somebody phones. Do not. A couple of streets is all it got: throttle gone limp, idle turned ragged, and a diesel Audi Q5 now sitting close to 2nd Fife Scout Group. Turn the vehicle off and call us.
Rumblingwell: stuck wherever you stopped
Some drivers get no suitable spot to pull over whatsoever. Hazards going at a lay-by somewhere, or stopped on the verge on Rumblingwell because you worked it out after setting off — our technicians take that call regularly enough that it is the usual kind.
Wait with the motor if it is sensible to sit there, but out of the vehicle if it's not. It will often oblige. A diesel running on petrol limps along quite willingly, and that's the catch: start it up to get to somewhere handier and the mix goes further into the system with every mile covered. However difficult the place, it is no problem for us to come to it, and that's far better for your car than carrying on.
Run it already? Stop, then check below
This is where your A823(M) comes in — under 3 miles from Rumblingwell. A drop in power, a lumpy idle, some smoke: those are the symptoms when they come, instead of a tidy stop — and a misfuelled diesel will often take you onto it and some distance along before anything seems wrong at all.
Get off at the first sensible exit, switch off, and don't start the vehicle to move it. Long trip? Anything close to the under a mile to the closest city and you should assume the lot — filter, pump, injectors, all of it got to by the mixture. Say that on the phone, as it affects what goes in the van.
Where's Rumblingwell?
Rumblingwell is a suburban area situated on the outskirts of Dunfermline in Fife, Scotland, with a mix of flat housing and local amenities. Rumblingwell sits at an elevation of 103 metres, close to the coastal landscape of the Firth of Forth. Rumblingwell is part of the wider Dunfermline urban area, which includes nearby places such as Baldridgeburn and Parkneuk. Rumblingwell has a population of around 3111 people, with many residents commuting to nearby towns and cities.
The job around Rumblingwell, step by step
- Our technicians ask first, price after. What was put in? How much? Has your motor run? Those responses alter what the work really is.
- Our engineers clear the tank of the polluted mixture.
- Our engineers clean the lines and clear the filter, so what is remaining in the system is not what caused the trouble.
- Bleeding the system follows, once clean diesel is in.
- When it's started, we make sure it runs correctly on new diesel.
That leaves it ready to set off. Our engineers do everything wherever the car has come to a stop, which means it never needs to be taken to a workshop, and when it has been spotted early, it is very unusual for there to be long-term damage.
Rumblingwell AdBlue removal is a separate problem
AdBlue rather than petrol? Then the first instruction is unchanged — the motor remains off — whereas this fault beneath it's a separate one altogether. The protection a fuel system relies on gets taken away by petrol, which dilutes your diesel. Rust and deposits are what a diesel tank ends up with instead, since AdBlue is urea dissolved in water.
AdBlue removal in Rumblingwell has a page of its own with the detail on it, including why it is usually the more significant of the two. We deal with both.
What a petrol-in-diesel fuel drain will cost in Rumblingwell
One number wouldn't be fair here, since this isn't one job. These are the things that shift it:
- Has it been started or driven? Nothing else matters for as much.
- The tank's capacity, set against how much of the wrong fuel got into it.
- Which was put in: unleaded or AdBlue.
- Where is it? And can our van get to it and work there sensibly?
Tell us what the vehicle is, how much got in, and whether your engine has run. A clear answer comes back, not a range. For your car at home that's going nowhere and is not time-critical, works too.
Rumblingwell drivers ask us these about petrol in diesel
I'm on a forecourt in Rumblingwell. Can you drain the vehicle on the spot?
A big part of this work takes place there, so yes. Consent from the site is the condition. Given that, a forecourt like BP is somewhere we're often enough, along with the rest of them locally — so name yours on the call and you will hear whether working there's possible.
A couple of litres of petrol in a diesel — too much?
Litres are not the yardstick. Ratio is, and much more than either, it counts whether 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 query in the end: has that mix been sucked right through, or has it not?
I drove the car after putting petrol in my diesel. What next?
Stop safely. Off. Nothing after that. Driving moves the problem along — out of your tank, into your pump and injectors. Motorists fear it a good deal more than the recovery rate warrants, mind. The one genuinely helpful thing left to you isn't restarting the vehicle.
Is a fuel drain going to void my warranty?
No. Carried out correctly, draining and cleaning is no modification at all, and the warranty from your manufacturer is unaffected by it. Another reason to leave it turned off: running a diesel on petrol is the thing more likely to cause a dispute with one.
Adding two-stroke oil, then driving home
No. It belongs to a separate problem from a bygone era, and petrol has thinned something no oil of that kind replaces. Petrol remains in that tank after that, whatever else goes in, and your pump gets no respite from it.
A main dealer for petrol in a diesel — needed?
There is no need to take it to a franchised dealer, as our engineers drain and flush your car wherever it is.
Is the vehicle still with you?
Don't switch the engine on again.
Driven it already? Then somewhere safe, stop, turn off, and no restarting the vehicle afterwards. Cold and parked, a car is in the best place available — and drivers fear this far more than the recovery rate warrants.
At the kerbside, on the forecourt or at home — mobile fuel draining in Rumblingwell and throughout Fife.