Petrol in a Diesel Car in Westminster Park: How Worried Should You Be?
Probably less than you already are — as long as nobody has started the car. Petrol resting in a diesel tank does nothing to the motor till something pulls it through your fuel system — the ignition priming the pump, the starter, or the drive itself. So the fair answer to the first query anyone in Westminster Park asks, "have I ruined it?", is generally no. Leave the motor off and phone Petrol in Diesel — that keeps it like that. The rest of this page explains what petrol really does to a diesel, how to judge how far it has got, and how to make sure it doesn't happen to you again.
Petrol in a diesel: what does it do to your engine?
Diesel does two jobs on its way through an engine. It ignites, and before it combusts it protects. Very fine clearances go into the injectors and the high-pressure pump, and only your diesel flowing through keeps their surfaces from grinding together.
Badly at the first, not at all at the second: that's petrol. The rattling comes from petrol being designed not to ignite when compressed, which is exactly the reverse of what a diesel needs. On top of that it is thinner than diesel, it strips out the protection your system rests on, and any pump running on that mix is wearing itself.
Together, those make the shape of the trouble clear. Not contact but circulation is what does the harm. Petrol in the tank is a fuel problem. Whatever a worn pump sheds goes on, carried by your fuel, into the fuel injectors downstream, which is why a pump that has been working on that petrol is where a mechanical problem starts.
How bad is petrol in a diesel? Four situations our engineers see in Westminster Park
Fuelled up, not once started. The best case there is. Being on a forecourt is what makes this possible: elsewhere, the car has been driven there to begin with. With the petrol held inside the tank alone, it is emptied and purged right where it stands, and nothing more is needed.
The ignition turned on, or a short start. Petrol has left that tank and reached your filter and your lines, since your system has been bled. Usually nothing more than draining, purging and sorting the filter, and so still simple.
Driven a few miles. Now your pump has spent these miles running on thinned fuel. Miles is only half of it; how hard it was driven counts equally. Either way the work runs to the tank, your lines, the fuel filter and fresh fuel through the whole system. The school run to Belgrave Primary School is one matter. Very different a second time: a run to Chester, under 3 miles away, or any miles on the M53, under 5 miles from Westminster Park, where the engine kept working hard.
It protested, and only then stopped: smoke, knocking, a throttle gone soft, an idle gone ragged. The engine is telling you your fuel is no longer behaving like diesel. Stop on the spot — on the verge on Lache Lane, at the kerb, down a side road — and don't move it. A car pulled over soon very seldom has permanent damage, as the fuel drain and the flush, which still come first, take care of it.
Westminster Park motorists and that petrol in a diesel myths they hear
It will not be fine. The myth: "Fill it the rest of the way with diesel and it'll be." Nothing is removed by topping up — you are left with a fuller tank, still the same mixture. Percentage isn't how a diesel fuel system copes with petrol, whatever that guidance supposes.
Myth: "A current diesel can cope with a bit of petrol." If anything, the opposite. Protection counts more on current diesels, not less, because their fuel runs through smaller parts at higher pressure.
"It starts, it drives, so no harm done" — the myth that catches most drivers than any other. The driver of a petrol engine fed diesel usually has no choice but to stop, since it will not run, and the damage stops there. Feed petrol to a diesel and it normally fires up, ticks over and pulls away as if nothing has happened — all while its pump is wearing. Fine and running aren't the same thing.
Myth: "Add some two-stroke oil and drive the vehicle home." It is an old workaround for a different issue. The petrol is still in the tank afterwards, and whatever it has diluted is not put back.
The next start sends petrol back round your pump from the lines and the filter, where some of that sits after the engine has run. That is why draining the tank yourself doesn't leave you sorted — a myth. On top of that, petrol cleared into a can by the road is genuinely hazardous.
How does petrol in a diesel happen?
Carelessness is rarely the cause, and nobody means to do it. The forecourt makes it simple: the petrol nozzle is the narrower of the two, and it slides into a diesel filler with almost no resistance, whilst a diesel nozzle generally won't go into a petrol vehicle at all. So the error runs one way.
Habit and your car falling out of step is when it occurs. Courtesy car, hire car, or a vehicle that's new. Two cars on one driveway, one petrol, one diesel. The pumps in a different order on a familiar forecourt. Racing for a train at Chester and filling up en route. Precisely the moment it takes place: after years of driving petrol, someone fills a diesel Volkswagen Golf for the first time. With rain, a call coming in, or children to deal with, the hand just does what it always has.
Avoiding petrol in a diesel next time you fill up in Westminster Park
- Not every forecourt in the UK keeps to green for unleaded and black for diesel, though most usually do. Read the pump's label; the colour is only a clue.
- Many cars state the fuel type inside the filler flap or on the cap, and so check it on your first fill in any motor you don't know.
- Good intentions do less than a sticker or a fob in a bright colour on your diesel's key when a home has one of each. So label it.
- Before the nozzle comes off the petrol pump the first time you fill a hired or new car, say "diesel" out loud. Silly, perhaps, yet it works.
- While you are thinking about something else, this is an easy mistake to make — so tuck the phone away.
- A misfuel inhibitor helps, up to a point. Some diesels come with a filler built to reject a petrol nozzle, and add-on devices exist for motors without one. They are a safety net, not a reason to stop checking the petrol pump.
- Less petrol makes a weaker mix, so stop as soon as you notice — though remembering that the next stage is unchanged. It's still not to start it.
Already put petrol in a diesel around Westminster Park?
The order of things is brief, then. Starting it is out, and so is turning on the ignition. Ask the staff to help you roll it clear of the pump if you're still at the forecourt, whether that is Asda or anywhere else. Then ring 0333 366 0103 and tell us what went in, about how much, and whether it's run.
Say so if it was AdBlue instead of petrol: it's a different issue, with its own page for Westminster Park, since AdBlue brings corrosion and deposits rather than lost lubrication.
One petrol in a diesel task around Westminster Park costs more than another. Why?
Four different jobs lie behind the four situations above — which is why there's no honest single price. The scenario itself does most of the work of moving the cost. Two things come after that: the petrol that went in as a share of what the tank takes, then the spot your car is in and whether our van can get to it safely.
That is why our technicians ask three queries before costing instead of after: what was put in, how much, and if it has run. With those answers, you get a straight figure rather than a range.
About Westminster Park itself
Westminster Park is a suburban area located on the outskirts of Chester, situated near the River Dee in Cheshire. Westminster Park sits at an elevation of around 25 metres, with detached housing being the predominant type of accommodation. Westminster Park is close to nearby places such as Curzon Park, Lache, and Handbridge, and is approximately 1 mile from Chester city centre.
Across Cheshire and around Westminster Park: fuel drain cover
The teams answering petrol in diesel jobs around Westminster Park, in the CH postcode area, equally work the places near it, Curzon Park, Lache and Handbridge included. No need to move the vehicle to us. Forecourts, supermarket car parks, lay-bys and your own drive are all locations where we work.
At the petrol pump around Westminster Park, still?
Then you're in the best place there is. Keep it off. Call.