Should You Worry? Petrol in a Diesel Car in Soundwell
Unstarted? Then less worried than you probably are. "Have I wrecked it?" is the first thing anyone in Soundwell asks, and the honest answer is usually no, since petrol resting in a diesel tank harms nothing until it's drawn through your fuel system — by ignition priming, by the starter, or by being driven. Leave the motor off and ring Petrol in Diesel — that is how you keep it that way. Read on for three things: the effect petrol has inside a diesel engine, the signs of how far it has got, and the way to make sure you don't do it again.
Petrol in a diesel: what does it do to the motor?
Two tasks fall to diesel on its journey through a motor. Oiling comes before burning; it does both. What stops the surfaces inside the high-pressure pump and the injectors from wearing against one another is your diesel passing through them — they are made to very fine clearances.
Of those two jobs, petrol manages the first poorly and the second not at all. It's runnier than diesel and strips away the lubrication the fuel system hinges on, and so a pump running on a petrol mixture is a pump wearing itself. And petrol is designed to resist igniting under compression, which is the reverse of what a diesel needs from its fuel. That is where the rattling comes from.
Put those together and the shape of the problem is clear. Contact does not do the damage — circulation does. All a tank with petrol in it amounts to is a fuel problem. The start of a mechanical problem is a pump that has been running on that petrol — and whatever a worn pump sheds travels on with your fuel to the injectors downstream.
Four scenarios we see in Soundwell: how bad is petrol in a diesel?
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 that petrol held in that tank alone, it's drained and cleaned on the spot, and nothing more is needed.
The ignition switched on, or a short start. Once primed, the system has pulled petrol from your tank up to the filter and the lines. That is usually still a simple task — a drain, a flush, and the filter dealt with.
Those few miles on the road were your pump labouring on fuel thinned by petrol throughout. Distance is only half of it; how hard it was driven counts just as much. Either way this work includes your tank, the fuel lines, the filter and fresh fuel through the whole system. Short trips, such as the school run to The Tynings Primary School, are one thing. Any miles on the M4, under 3 miles from Soundwell, means your engine has worked hard throughout, and a run to Bristol, under 5 miles away, is a very different task too.
It complained, and only then stopped: smoke, rattling, a throttle gone soft, an idle gone ragged. That is your motor telling you its fuel has stopped acting like diesel. Stop wherever you are — the verge on Rodway View, a lay-by, a side street — and leave the car where it is. Lasting damage is very unusual if a vehicle is stopped soon, and the drain and flush-through that still come first sort it out.
Soundwell drivers and the petrol in a diesel myths they hear
False: topping up to full with diesel makes it fine. It doesn't. Topping up removes nothing; it gives you a bigger tank of the same mixture. Percentage is not how a diesel fuel system copes with petrol, however much that advice supposes.
Myth: "A newer diesel can cope with a bit of petrol." If anything, the reverse. A current diesel sends its fuel through more precise parts at higher pressure, which makes the lubrication matter more, not less.
"It starts, it drives, and so no harm done" — the myth that catches more motorists than any other. Feed diesel to a petrol motor and it generally will not run, so the motorist stops — and the damage stops with them. A diesel fed petrol usually starts, ticks over and drives away as though nothing has happened, whilst your pump grinds. Being able to run isn't proof of being fine.
Myth: "Add some two-stroke oil and drive the vehicle home." It is an outdated fix for a distinct fault. The petrol is still inside that tank afterwards, and what it has thinned isn't put back.
Myth: "Drain your tank yourself and you are sorted." Once the engine has run, some of that petrol is no longer in the tank: it is in the fuel filter and your lines, and it goes straight back through the pump on the next start. Besides, petrol drained into a can by the road is genuinely dangerous.
How does petrol in a diesel take place?
It is rarely carelessness, and nobody does it on purpose. The petrol nozzle is the narrower of the two and slides into a diesel filler with almost no resistance; a diesel nozzle generally will not go into a petrol motor at all. The forecourt makes it easy, and the error runs one way.
It takes place when habit and the vehicle stop matching. A new vehicle, a hire car or a courtesy car. A household with one petrol and one diesel on the drive. A forecourt you know, but with its pumps laid out differently. Filling up in a rush en route to Bristol Parkway, with a train to catch. Precisely the moment it takes place: after years of driving petrol, a driver fills a diesel Volkswagen Passat for the first time. Throw in rain, a phone call or a back seat full of children, and the hand repeats what it has always done.
Soundwell people: how to prevent petrol in a diesel next time
- The label is what counts, so read the pump rather than the colour: in the UK unleaded handles are usually green and diesel black, yet not on each forecourt.
- Many vehicles state the fuel inside your filler flap or on the cap, so check there on the first fill in a motor you do not know.
- A coloured fob or a sticker on the diesel's key does more than any amount of intending to remember, in a home with one of each.
- Before the nozzle leaves the pump the first time you fill a hired or new motor, say "diesel" aloud. Silly, yes, but it does the trick.
- Put your phone away. This is an easy mistake to make whilst you're thinking about something else.
- Add-on devices are available for motors without one, and some diesels come with a filler that won't take a petrol nozzle. Useful — but a backstop at best, never a reason to stop checking the label.
- As soon as you notice, stop: less petrol in the tank makes a weaker mixture. What to do next does not change, though — still don't fire it up.
Put petrol in a diesel in Soundwell already?
Then, there's only a short order of things. Leave it unstarted, with the ignition off as well. The attendants on the forecourt — whether at Esso itself or wherever you filled up — will normally help push it clear of the petrol pump if you ask. What went in, roughly how much, and whether it has run: tell us that when you call 0333 366 0103.
Say so if it was AdBlue instead of petrol: it is a separate problem, with its own page for Soundwell, because AdBlue brings corrosion and deposits instead of lost lubrication.
What makes one Soundwell petrol in a diesel job cost more than the next
An honest single price doesn't exist here: four scenarios, four separate tasks. The situation itself does most of the work of moving the cost. Where the vehicle is counts too, and whether our van can safely get to it, after the ratio of petrol to what your tank holds.
Three questions come first, before quoting, rather than after — what went in, how much, has it run — and that is the reason. A range becomes a straight figure when the answers are in.
About Soundwell
Soundwell is a locality in Gloucestershire, situated on the riverside near Bristol, with a mix of terraced housing and other residential properties. Soundwell sits at an elevation of around 74 metres, close to the River Avon and the nearby settlements of Lower Soundwell and Upper Soundwell. Soundwell is located near the city of Bristol, which is approximately 4.7 miles away, and is part of the larger urban area surrounding the city. Soundwell has a population of around 4599 people, living in a variety of housing types, predominantly terraced homes.
Across Gloucestershire and around Soundwell: fuel drain cover
The vans answering petrol in diesel calls around Soundwell, in the BS postcode area, also work the spots around it, Lower Soundwell, Upper Soundwell and Staple Hill among them. We drain wherever your car is — your own driveway, a lay-by, a supermarket car park, a forecourt — so it never needs to come to us.
In Soundwell and still at the pump?
Then you are in the best position there is. Ring, and leave it turned off.