Should You Worry? Petrol in a Diesel Car in Southwick
Probably less than you are now — as long as nobody has started it. Till the ignition primes the pump, the starter turns, or the vehicle is driven, petrol in a diesel tank just waits there and does nothing. Which means the truthful reply to that first Southwick question — "have I wrecked it?" — normally no. Petrol in Diesel is who to ring, with your motor left off, and so it stays that way. What petrol really does to a diesel, how to gauge how far it has travelled, and how to keep it from happening again: that is the remainder of this page.
Petrol in a diesel: what does it do to the motor?
Diesel does two tasks on its way through a motor. It lubricates first, and after that does it burn. Very fine clearances are built into your injectors and the high-pressure fuel pump, and just the diesel running through stops their surfaces grinding together.
The second task petrol does not do at all, and the first it does poorly. Being less viscous than diesel, petrol strips out the lubrication a fuel system needs, so a pump on the mixture wearing itself. It is equally made to resist igniting under compression — the opposite of what a diesel needs — which is why you hear the knocking.
Put those together and the shape of the issue is plain. Contact does not do the harm — movement does. All a tank with petrol in it amounts to is a fuel issue. Whatever a worn pump sheds travels on, borne by the fuel, into the injectors downstream, which is why a pump that has been working on the petrol is where a mechanical fault starts.
Petrol in a diesel in Southwick: how bad is it? Four cases
The best case there can be: filled up, never started. Only that tank has petrol in it, so the task is emptying that tank and purging the system where the car sits. This scenario can only truly take place at a forecourt: anywhere else, the vehicle got there by being driven.
A brief spell of running, or just the ignition on. Petrol has left your tank and got to the filter and your lines, because your system has been bled. Usually little more than clearing, cleaning and sorting the fuel filter, so still easy.
The pump now worked a couple of miles on diluted fuel — that's what driving it does. The work is your tank, the lines, the filter and clean fuel through the whole system, and how hard the car was driven counts as much as how far. Short trips, such as the school run to Southwick Community Primary School, are one thing. A run as far as Sunderland, under 3 miles away, is a very different task. So is any miles on the A194(M), under 5 miles from Southwick, where your engine has been working hard throughout.
It complained, and only then stopped: smoke, knocking, a throttle gone soft, an idle gone lumpy. What you are hearing is the engine signalling fuel that no longer runs like diesel. Stop where you are — on the verge on Beaumont Street, at the kerb, down a side road — and don't move it. The drain and flush still come first, and they take care of it: if a vehicle is stopped quickly, lasting damage is very rare.
Myths Southwick motorists hear about petrol in a diesel
Myth: "Fill it the rest of the way with diesel and it'll be fine." It will not. Topping up takes out nothing; it gives you a fuller tank of the same mix. Percentage isn't how a diesel fuel system copes with petrol, however much that guidance assumes.
"Current diesels can handle a little petrol" — a myth, and closer to the reverse. A current diesel runs its fuel through more precise parts at higher pressure, which makes the lubrication matter more, not less.
Myth: "If it starts and drives, there is no harm done." This is the one that fools people. The motorist of a petrol motor fed diesel usually stops, because it will not run, and the harm stops there. Feed petrol to a diesel and it generally fires up, ticks over and drives away as if nothing happened — all while its pump wears. Running isn't the same as fine.
Myth: "Add some two-stroke oil and drive it home." It's an outdated fix for a different problem. What petrol has thinned stays diluted, and the petrol stays in your tank regardless.
If the motor has run, part of that petrol is in your filter and your lines, not your tank — and your next start sends it straight back through your pump. So the myth "drain your tank yourself and you are sorted" doesn't stand up. And, a can of petrol filled by the kerbside is truly dangerous.
Why petrol in a diesel takes place at all
It's seldom carelessness, and no one does it on purpose. The petrol nozzle is the slimmer of the two and slides into a diesel filler with almost no resistance; a diesel nozzle mostly won't go into a petrol vehicle at all. The forecourt makes it easy, and the error runs one way.
Routine and your car falling out of step is how it occurs. Courtesy car, hire car, or a vehicle that is brand new. Two vehicles on one driveway, one petrol, one diesel. A well-known forecourt with the pumps in a different order. A train to catch, and a hurried fill on the way to Seaburn. Exactly the moment it happens: after years of driving petrol, someone fills a diesel Volkswagen Passat for the first time. Add a back seat full of kids, a phone call or rain, and the hand takes over.
How to avoid petrol in a diesel at your next fill-up in Southwick
- The label is what counts, so read the pump instead of the colour: in the UK unleaded handles are usually green and diesel black, but not on each forecourt.
- Plenty of cars state the fuel type inside the filler flap or on the cap, and so check there on your first fill in any motor you don't know.
- Good intentions do less than a sticker or a fob in a vivid colour on the diesel's key if a home has one of each. So label it.
- It seems daft and it works: on your first fill in a new or hired car, say "diesel" aloud before you lift the nozzle off the pump.
- Mistakes like this are straightforward to make while your mind is on something else, so your phone goes away.
- Up to a point, a misfuel inhibitor helps: some diesels come with a filler built to reject a petrol nozzle, and aftermarket devices are available for the rest. Treat it as a backstop, then keep reading the petrol pump.
- As soon as you notice, stop: less petrol inside that tank makes a weaker mix. What to do next does not change, though — still don't fire it up.
Put petrol in a diesel in Southwick already?
Then the order of things is brief. Don't start the car, and don't turn the ignition on. Ask the attendants to help you roll it clear of the petrol pump if you're still on the forecourt, whether that is Asda or somewhere else. Then call 0333 366 0103 and tell us what got in, roughly how much, and whether it's run.
AdBlue, not petrol? Then tell us. Corrosion and deposits, not lost lubrication, make it a different fault — Southwick has a page all for it.
Why one petrol in a diesel task in Southwick costs more than another
Four separate jobs lie behind the four scenarios above — which is why there is no fair single quote. The scenario itself does most of the work of moving your cost. Two things follow that: the petrol that got in as a share of what your tank holds, then the place the car is in and whether a van can get to it safely.
What got in, how much, and whether it's run — three queries our technicians ask before quoting, not after, for precisely that reason. A range becomes a straight figure once the replies are in.
About Southwick, briefly
Southwick is a suburban area in Tyne and Wear, situated on the coast near Sunderland. Southwick has a mix of housing types, but is predominantly characterized by terraced homes. Southwick sits at an elevation of 41 metres, looking out over the coastal landscape of the North East. Southwick is located close to nearby places such as Low Southwick and High Southwick.
Fuel drain cover across Tyne and Wear, Southwick included
Low Southwick, High Southwick and Deptford are among the locations around Southwick that the same vans work, answering petrol in diesel jobs across Southwick's SR postcode area. We drain where the vehicle is — your own drive, a lay-by, a supermarket car park, a forecourt — so it never needs to come to us.
At the petrol pump around Southwick, right now?
Then you are in the best place there can be. Turned off it remains; then ring.