Numpty of the week contender - Petrol into diesel RR

LSE3.9 said:

I guess it can't be good but what are the ramifications of doing this?

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Plus as the Diesel won't burn - it could end up hydraulic-ing the engine (this is like when you get water in the intake and locks up the engine solid)

Saint.V8 said:

Plus as the Diesel won't burn - it could end up hydraulic-ing the engine (this is like when you get water in the intake and locks up the engine solid)

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It also goes past the rings and into the sump and thins the engine oil down!
BANG!!!!

Lucky it wasn't the other way around then you would be fecked hope you filled it right up to dilute it as much as possible

chort said:

Two guys at work had driven 50 km on petrol with a Renault Kangoo dCi diesel. Only then a MIL light came on and they stopped. The engine seems fine, as does the fuel pump, but that's a common rail diesel... Anyway, diesel can run on almost anything.

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In theory a diesel engine can run on almost anything that resembles diesel, but modern diesels have very sophisticated FI and emissions system which will not tolerate anything but diesel. Modern FI systems run at such high pressures (to improve emissions) that the tolerance of the high pressure pump can be measured in nanometres, it is the fuel itself which lubricates these pumps, over 10% ethanol alone is enough to kill one of these modern pumps, the impellers pick up from lack of lubrication and then sent debris downstream (particles often small enough to go through filters) which then take the injectors with them. This is why most modern cars will shut the fuel pump down BEFORE they actually run out of fuel - these pumps cannot even tolerate being run dry for a few seconds.

Then there's the exhaust side, you often have DPF systems which need to be burned off when suitable operating conditions are met, the FI system has to inject extra fuel on the exhaust stroke which is supposed to light up and burn off the crud off in the particulate filter, often a percentage of this fuel will end up squeezing past the rings into the engine oil, a bit of diesel in the engine oil can be tolerated - not so with other substances which may cause sludge or drastically reduce the lubricative properties of the oil. Then there's the DPF itself - can it tolerate the concoction now burning inside it? Add some petrol vapour into the mix, could it even explode?

Old diesels are great, but you certainly cannot run modern ones on anything.

Steve, i completely agree with that.

Regarding that Kangoo, i'm just on the way of checking why it smells like something is burning... i guess that 50 km wasn't such a good idea after all.