Petrol in older diesel Octavia
Petrol in older diesel Octavia
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Howaboutthis

Original Poster:

162 posts

92 months

Saturday 16th May 2020
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Help please, about a third of a tank of petrol gas been added to our nearly empty 2004 Octavia diesel, and it's been driven 18 miles or so. It's home again but won't restart for a short trip to top up with diesel. It's a 110hp TDI.
Is there any way I can drain the tank myself? I imagine it has an anti siphon thing in the filler.
It's had some petrol in it before, but the mistake was spotted at the filling station and topping up with diesel worked ok. At the time I put in a little two stroke oil as well to help lubrication.
Or, leave it to the professionals on Monday.

Dynion Araf Uchaf

5,192 posts

253 months

Saturday 16th May 2020
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call wrong fuel doctor, ( google). they sorted my wife car out in the same situation, cost about £140,plus some fuel

imagineifyeswill

1,250 posts

196 months

Saturday 16th May 2020
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I think a Octavia has an electric pump in the tank, disconnect feed pipe at filter, connect longer piece of pipe in to empty drum, find fuel pump fuse and jump power from nearby live fuse and leave to pump itself dry.

tomic

720 posts

175 months

Saturday 16th May 2020
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Dynion Araf Uchaf said:
call wrong fuel doctor, ( google). they sorted my wife car out in the same situation, cost about £140,plus some fuel
This

I was in Germany in 2004 in a car with the 110hp engine and "Falschgetankt" while the car had about half a tank of Diesel in it.

I managed to get a fair way before the Engine Management Light came on and had it recovered and drained.

The car never really drove as nicely again.

Howaboutthis

Original Poster:

162 posts

92 months

Saturday 16th May 2020
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The fuel pump method sounds good, is there an issue with priming the fuel system after that?

GreenV8S

31,027 posts

314 months

Saturday 16th May 2020
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The problem with using the fuel pump to drain the tank is that the fuel pump is one of the first things damaged by using the wrong fuel. Since you've driven it quite a few miles it may already be too late, but to minimise the risk of further damage you don't want to so much as turn the key until you can get an expert to it.

Howaboutthis

Original Poster:

162 posts

92 months

Sunday 17th May 2020
quotequote all
Gotcha.
The thinking here at the moment is call an expert. For less than 140 bucks, I hope.

GreenV8S

31,027 posts

314 months

Sunday 17th May 2020
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Here's hoping that's all there is to it, but the risk is that if any damage has occurred then this puts metal debris through the rest of the fuel system, which has various components with very fine tolerances which will be wrecked by it. And of course it would only need a tiny amount of swarf left in the system after you have repaired it, to go through the pump again and start the whole cycle all over again. This is why mis-fueling can often lead to replacing every component in the fuel system, which gets hugely expensive.

saladdays

141 posts

95 months

Sunday 17th May 2020
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Whilst you're waiting for a tow-truck, mechanic or a miracle have a look at this video. There's is some hope!
https://youtu.be/GL9-i9tcESU?t=240

dingg

4,561 posts

249 months

Sunday 17th May 2020
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GreenV8S said:
The problem with using the fuel pump to drain the tank is that the fuel pump is one of the first things damaged by using the wrong fuel. Since you've driven it quite a few miles it may already be too late, but to minimise the risk of further damage you don't want to so much as turn the key until you can get an expert to it.
I thought the in tank fuel pump would be ok and it was the hp injection pump that usually got damaged?

Anyway, when my wife filled the van one time with petrol and only noticed when she was almost at home and the thing was in her words ' rattling and banging a bit' I just drained it by disconnecting at the priming bulb by the engine bay filter and pumping it into a couple of 5lt drums, filled with diesel and didn't experience any issues whatsoever afterwards.

Kangoo 1.5 btw.

Good luck op you may be lucky

imagineifyeswill

1,250 posts

196 months

Sunday 17th May 2020
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The in tank pump is a straightforward electric pump and will come to no harm from pumping petrol, its the injection or high pressure pump that can be damaged by the wrong fuel.

Aside to the last statement I ran a breakdown recovery service for 17 years and have drained more misfuels than I care to remember and have never failed to get one restarted with no discernable problem, many of these vehicles belonged to local people and some of them my customers, I dont know of any that had future fuel system problems down the line

eltax91

10,771 posts

236 months

Sunday 17th May 2020
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Octavia of that vintage has easy access to the fuel tank. Lift up the seat base in the back, undo the collar holding the pump in and voila, fuel tank. Siphon away.

I did this with my very own MY00 110 TDi when it was unceremoniously written off about 30 miles after I brimmed it.

Howaboutthis

Original Poster:

162 posts

92 months

Monday 18th May 2020
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Home start insurance covered the cost of towing to a garage.
The recovery bloke got it out of the drive on the starter motor in reverse gear,it was a bit scary to see to be honest. Anyway, it's at our friendly local garage now. Later: Great, the car is back home, €100 including a new fuel filter and sure enough, he got at the tank from under the back seat. I've just been for a drive, it's going better than ever, not bad for a car that's been as far as the Moon. If you see what I mean.
Thanks for the input guys, appreciate it.

Gooose

1,520 posts

109 months

Tuesday 19th May 2020
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I put petrol in my 330d e46, drove a fair wack and it started jumping around and stuttering all over the place, took me ages to figure out I put petrol in it as I couldn’t really believe I could be so dim!

Just disconnected the fuel line to the filter and turned the key so the fuel pump kicked in, pumped it out and brimmed it with diesel, ran better than ever after, I’ve still got it with 200k on the clock! I’m convinced it cleaned the engine out lol!