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post #3 of (permalink) Old 7th May 2009
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Where is the smell of petrol coming from? front or rear fo the car.

Next time it does this might be worth pulling over and trying to see if you can locate the source.

Could well be a duff injector or a fuel leak.

If the engine is reving to 3k this could be the ECU going into Limp home mode for a brief moment. Could be worth taking it into a grage to have fault codes read. Do you get any engine management lights on when this happens? Could just be a loose or corroded connection. Check all connection to the ECU and throttle body are clean and tight. as the car is 2004 i assume it'll be fly by wire (no throttle cable) check the connectors the the pedal too.

As dangerous as it can be to have a fuel leak any where on a car, please don't think that it'll spontaneously combust into a ball of flames, because it won't.

For a start, petrol doesn't burn. Petrol vapour does.

If by some miracle you could drop a burning match into a pool of petrol without igniting the vapour emintating from it, the match would just go out. This is also why fuel injectors or carbs atomize petrol into a fine mist and them mix it with air inorder to be burt. This also explains why a car will not start when you flood the engine.

You need a source of ignition to make petrol vapour ignite, this is in the form of a spark (electrical or static) or a naked flame. Heat is not enough. There have been tests carried out that show petrol dripping onto a red hot exhaust manifold, all that happened was it boild off.

Petrol will ignite with heat though under certain circumstances. Normally it has to be mixed with air and compressed until it is very hot and we're talking uber hot here. This is called pre ignition in petrol cars or normal running for a diesel But then diesels run on diesel fuel not petrol.

The most common cause of a car fire is due to dodgy electrics where cables short out and smoulder. The melting plastic then catches fire.

Sorry to rant on just wanted to clear up a common misconception about fuel leaks and not cause any undue panic

Understeer is when you hit the wall with the front of the car.
Oversteer is when you hit the wall with the rear of the car.
Horsepower is how fast you hit the wall.
Torque is how far you take the wall with you.

PSN: MEW1980
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