Hambleton: Petrol in a Diesel Car? How Worried to Be
Less than you probably are, if it hasn't been started. Till your ignition primes your pump, the starter cranks, or your vehicle is driven, petrol in a diesel tank simply waits there and does nothing. Which makes the truthful reply to that first Hambleton question — "have I wrecked it?" — normally no. Keep it like that: leave the motor off then phone Petrol in Diesel. Further down, this page sets out what petrol actually does inside a diesel, how far it may have gone, and how to stop it happening to you a second time.
Inside the motor: what petrol in a diesel really does
Diesel does two jobs on its way through a motor. Before it combusts, it lubricates — then it combusts. Designed to very fine gaps, the fuel injectors and your pump depend on the diesel moving through them to keep their surfaces from wearing against one another.
Badly at the first, not at all at the second: that's petrol. A pump working on a petrol blend is wearing itself out, because petrol is thinner than diesel and strips out the protection the fuel system relies on. Petrol is also designed to resist igniting under compression — the reverse of what a diesel needs from its fuel — and that is where any knocking starts.
Put these together and the shape of the issue is clear. Contact doesn't do the harm — movement does. Any tank with petrol in it is a fuel problem. The start of a mechanical problem is a pump that has been labouring on that petrol — and whatever a worn pump sheds moves on with your fuel to your injectors downstream.
How serious is petrol in a diesel? Four situations our engineers see around Hambleton
Filled up, and never started: nothing beats it. Being at a forecourt is what makes this possible: elsewhere, the car has been driven there to begin with. With the petrol kept inside your tank alone, it is drained and rinsed right where it stands, and nothing more is needed.
Your ignition turned on, or a brief start. The system has been primed, and so petrol has left the tank and got to your filter and the fuel lines. Still generally easy: drain, flush, and your filter sorted.
Your pump now worked a couple of miles on thinned fuel — that is what driving the car does. Miles 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 clean fuel through the entire circuit. Driving the kids to Hambleton Primary Academy is one kind of trip. Any mileage on the M55, under 10 miles from Hambleton, means the motor has worked hard throughout, and a run to Preston, under 15 miles away, makes a very different task as well.
Rattling, a ragged idle, smoke, a throttle gone soft: driven till it complained. That's the engine telling you its fuel has stopped acting like diesel. Whether it's the verge on Stoney Lane, a lay-by or a side street, stop there then leave it. A car stopped soon very rarely has lasting damage, because the drain and the flush-through, which still go first, sort it out.
Petrol in a diesel stories Hambleton people hear
Myth: topping up to full with diesel makes it fine. It does not. A fuller tank of the same mix is all it gives, since topping up takes out nothing. That advice presumes a diesel fuel system handles petrol by percentage. It doesn't.
Not so: a newer diesel copes with a bit of petrol. If anything, the reverse. Smaller components and higher pressure are the way a newer diesel runs its fuel, and that makes the lubrication matter more, not less.
One myth that catches motorists off guard: if it starts and drives, it must be unharmed. The driver of a petrol engine fed diesel normally has no choice but to stop, because it will not run, and the harm stops with them. Nothing looks to have happened when a diesel fed petrol fires up, ticks over and drives away, as it usually will; meanwhile the pump wears. Running isn't the same as fine.
Myth: "Add some two-stroke oil and drive it home." It is an old fix for a distinct issue. What petrol has diluted remains diluted, and that petrol stays in your tank anyway.
Myth: "Drain the tank yourself and you're sorted." After the engine has been run, some of that petrol is no longer in that tank: it is in the fuel filter and your lines, and it goes right back through the pump at the next start. It is also truly risky to drain petrol into a can at the roadside.
How petrol ends up: petrol in a diesel
On purpose? Never. Through carelessness? Rarely, if ever. A diesel nozzle mostly won't go into a petrol vehicle, yet the smaller petrol nozzle goes into the filler of a diesel nearly without resistance — so forecourts make this one error easy, and only in that direction.
The moment routine stops matching your car is the moment it happens. A new car, a hire car or a courtesy car. Households running one of each, petrol and diesel. Your usual forecourt, its pumps suddenly in a different order. Filling up in a rush en route to Poulton-Le-Fylde, with a train to catch. The first fill-up in a diesel Renault Clio after years of driving petrol is precisely the moment it takes place. Add rain, a phone call or a back seat full of kids, and the hand repeats what it has always done.
Preventing petrol in a diesel next time you fill up in Hambleton
- Green for unleaded and black for diesel is usual in the UK — but not on each forecourt. Go by the label on the pump, not the colour.
- Plenty of cars state the fuel type inside your filler flap or on the cap, so check there on the first fill in any motor you do not know.
- A coloured fob or a sticker on the diesel's key achieves more than any amount of meaning to remember, in a household with one of each.
- "Diesel", out loud, before you lift the nozzle — each time a new or hired car gets its first tank. It seems silly. It does the trick.
- Thinking about something else is when this becomes an easy mistake to make, and so put the phone away and keep your mind on the pump.
- Up to a point, a misfuel inhibitor helps: some diesels have a filler designed to block a petrol nozzle, and add-on devices exist for the remainder. Treat it as a backstop, then keep checking the petrol pump.
- Stop as soon as you realise. Less petrol in the tank makes a weaker mix. It doesn't change what to do next, which is still not to crank it.
Hambleton: already put petrol in a diesel?
The order of things is brief, then. Don't start it, and do not switch the ignition on. The staff on the forecourt — whether at Texaco itself or wherever you filled up — will usually help push it clear of the pump if you ask. Then ring 0333 366 0103 and tell us what got in, roughly how much, and if it has run.
If it was AdBlue instead of petrol, say so. That's a different fault — corrosion and deposits and not lost protection — and it has its own page for Hambleton.
Why one petrol in a diesel task in Hambleton costs more than another
There is no fair single quote for this, since the four situations above are four different jobs. Which of them you are in is chiefly what shifts the cost. Two things come after that: the petrol that was put in as a proportion of what that tank holds, then the place the vehicle is in and whether our van can reach it safely.
What was put in, how much, and whether it has run — three questions we ask before quoting, not after, for precisely that reason. Those replies are what turn a range into one firm number.
About Hambleton, briefly
Hambleton is a village in Lancashire, situated on the riverside at a low elevation of around 6 metres. Hambleton lies near the city of Preston, approximately 13 miles away, and is surrounded by nearby places such as Sower Carr and Hambleton Moss Side. Hambleton has a population of around 2428 people, predominantly living in semi-detached housing.
Across Lancashire and around Hambleton: fuel drain cover
Petrol in diesel jobs in Hambleton — part of the FY postcode area — go to teams that likewise cover the places around it, Sower Carr, Hambleton Moss Side and Cold Row included. Our engineers drain where your car is — your own drive, a lay-by, a supermarket car park, a forecourt — so it never needs to come to us.
At the pump in Hambleton, right now?
The best place there is, then — that is where you are. Keep the vehicle turned off, then ring.