Should You Worry? Petrol in a Diesel Car in Norman Hill
Less than you likely are, if it hasn't been started. Till the ignition primes the pump, the starter turns, or the vehicle is driven, petrol in a diesel tank just rests there and does no harm. Which means the honest reply to that first Norman Hill query — "have I ruined it?" — normally no. Petrol in Diesel is who to phone, with the motor left off, so it remains that way. 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 does not happen to you a second time.
What petrol in a diesel does to the engine
Two jobs fall to diesel on its journey round a motor. Before it ignites, it protects — then it burns. What stops the surfaces inside the high-pressure pump and your injectors from wearing against each other is the diesel passing through them — they're made to very fine clearances.
Petrol does the first task badly and the second not at all. The clattering comes from petrol being designed not to ignite when compressed, which is precisely the reverse of what a diesel needs. On top of that it is thinner than diesel, it strips away the lubrication the fuel system depends on, and any pump working on that blend is wearing itself.
Together, those make the shape of the issue plain. It is circulation that does the harm, not contact. Any tank with petrol in it is a fuel problem. A pump that has been labouring on that petrol is the start of a mechanical one, and whatever a worn pump sheds moves on with your fuel to the fuel injectors downstream.
Four situations our technicians see in Norman Hill: how bad is petrol in a diesel?
Fuelled, and never started: no case is better. Being on a forecourt is what makes this the case: elsewhere, the vehicle has been driven there to begin with. With the petrol held inside that tank alone, it is emptied and purged on the spot, and nothing more is needed.
The ignition switched on, or a brief start. Once primed, the system has pulled petrol from that tank as far as the fuel filter and the lines. Still usually simple: drain, flush, and the filter seen to.
Those few miles on the road meant your pump labouring on fuel thinned by petrol the whole way. Mileage is only half of it; how hard it was driven matters just as much. Either way this work includes that tank, the fuel lines, the filter and fresh fuel through the entire system. The school run to Cam Everlands Primary School is one thing. Getting as far as Gloucester, under 15 miles away, makes a very different job — as does any mileage on the M5, under 3 miles from Norman Hill, with the motor running hard all the way.
It complained, and only then stopped: smoke, clattering, a throttle gone soft, an idle gone lumpy. The fuel isn't behaving like diesel any more, and your engine is saying so. Leave it wherever it stops: a lay-by, a quiet street, the verge on Marlstone Road. What goes first is still the fuel drain and flush, and that deals with it, with lasting damage very rare when a vehicle is stopped quickly.
Petrol in a diesel myths Norman Hill motorists hear
Myth: topping up to full with diesel makes it fine. It doesn't. Nothing is removed by topping up — you are left with a fuller tank, still the same mix. The assumption behind the advice — that diesel fuel systems tolerate petrol by percentage — is wrong.
Myth: a modern diesel copes with a bit of petrol. If anything, the opposite. At higher pressure, through more precise components: that is how a modern diesel moves its fuel, so the protection matters more, not less.
The myth that catches people off guard: if it starts and drives, it must be unharmed. Diesel in a petrol motor usually leaves a motor that will not run: the motorist stops, and so does the damage. Nothing looks to have happened when a diesel fed petrol fires up, ticks over and drives away, which it usually does; meanwhile the pump grinds. Running isn't the same as fine.
Not so: a two-stroke additive lets you to drive home. It is an old fix, meant for another issue. That petrol is still inside the tank afterwards, and whatever it has thinned is not put back.
"Drain it yourself and you are sorted" — a myth, because after it's been running some petrol sits in your filter and lines, waiting to go right back through your pump on your next start. And, a can of petrol filled at the roadside is truly dangerous.
How does petrol in a diesel occur?
A careless moment is rarely the cause, and no one means to do it. A diesel nozzle generally won't go into a petrol motor, yet the slimmer petrol nozzle goes into the filler of a diesel nearly without resistance — so forecourts make this one mistake straightforward, and only in one direction.
Habit and your car getting out of step is how it happens. Hire cars, courtesy cars, and motors that are new to you. A household with one petrol and one diesel on the drive. Your ordinary forecourt, its pumps suddenly in a different order. A train to catch, and a rushed fill en route to Cam & Dursley. Exactly the moment it occurs: after years of driving petrol, a driver fills a diesel Renault Megane for the first time. The hand does what it has always done once you add rain, a phone call or a back seat full of kids.
Avoiding petrol in a diesel next time you fill up in Norman Hill
- Not every forecourt in the UK follows green for unleaded and black for diesel, though most usually do. Read the pump's label; the colour is only a hint.
- The first fill in a strange motor is the time to check your filler flap — on it, or on the cap, many vehicles state the fuel they take.
- One of each in the household? Mark your key to the diesel — a coloured fob, a sticker — because meaning to remember is not enough.
- "Diesel", aloud, before you lift the nozzle — every time a new or hired car needs its first tank. It seems silly. It does the trick.
- Thinking about something else is when this becomes an easy mistake to make, so put your phone away then keep your mind on the petrol pump.
- Add-on devices exist for vehicles without one, and some diesels come with a filler that won't accept a petrol nozzle. Helpful — but a backstop only, never a reason to stop checking the label.
- Less petrol means a thinner mixture, so stop as soon as you notice — while remembering that the next step is unchanged. It is still not to start the vehicle.
Put petrol in a diesel around Norman Hill already?
In that case, there's just a short order of things. Leave it unstarted, with your ignition off too. The attendants at the forecourt — whether at Texaco itself or wherever you filled up — will normally help roll it clear of the pump if you ask. Next, 0333 366 0103. We'll ask what went in, about how much, and if it has been run.
Say so if it was AdBlue instead of petrol: it is a separate fault, with its own page for Norman Hill, since AdBlue brings corrosion and deposits rather than lost lubrication.
Norman Hill petrol in a diesel tasks: why one costs more than another
An honest single price doesn't exist here: four situations, four separate jobs. What shifts the cost is chiefly which of them you're in. The proportion counts next, meaning how much of that tank is petrol, and then the position of your car and whether reaching it is safe for a technician.
Three questions come first, before any quote, rather than after — what went in, how much, has it run — and that is the reason. Those replies turn a range into a straight figure.
About Norman Hill and where it is
Norman Hill is a suburban area situated on the riverside in Gloucestershire, with an elevation of 64 metres. Norman Hill lies near several other local places, including Summerhayes, Everlands, and Sandpits, and is approximately 12.7 miles from Gloucester. Norman Hill has a population of around 5081 people, predominantly living in semi-detached housing. Norman Hill is also relatively close to the national motorway network, being about 96.8 miles west of London.
Fuel drain cover across Gloucestershire, Norman Hill included
Summerhayes, Everlands and Sandpits are among the locations near Norman Hill that the same vans work, answering petrol in diesel jobs across Norman Hill's GL postcode area. You need not move your car to us. Forecourts, supermarket car parks, lay-bys and your own driveway are all places where we work.
In Norman Hill and still at the petrol pump?
The best spot there is, then — that's where you are. Phone, and keep it turned off.