mistake by nephew
mistake by nephew
(OP)
my nephew accindently pumped about 8 gallons of unleaded regular gasoline into his moms 99 VW jetta diesel, could use some advice on weather to try and pump it out or just what to do at this time, car has not been driven they had it towed and was wondering should we siphon it out just some help would be appreciated





RE: mistake by nephew
RE: mistake by nephew
Gasoline is a low cetane fuel. Actually there are multifuel diesel engines that will run on gasoline just fine. There is a lot of misunderstanding when it comes to this subject.
RE: mistake by nephew
The durability problems care due to the lack of lubrication for the high pressure injection pump.
Follow the previous advice about safe draining of the system. Don't bother purging it, as it is an unnecessary expense. Don't bother towing it, but get some diesel in a drum, say 20 litres or 5 gallons, add it to the tank and drive slowly to the nearest bowser.
Ensure the nephew is inconvenienced by this, so he will know not to do it again.
Regards
pat pprimmer@acay.com.au
eng-tips, by professional engineers for professional engineers
Please see FAQ731-376 for tips on how to make the best use of Eng-Tips Fora.
RE: mistake by nephew
I always thought that the Diesel engine ran by combustion, NOT detonation.
RE: mistake by nephew
What Pat was saying, I believe, is that diesel engines are compression-ignited rather than spark-ignited, and that the combustion is controlled by the amount of fuel injected and the injection timings, so the destructive knock (detonation) that occurs in a gasoline engine is not a concern for a diesel.
What's a bowser?
RE: mistake by nephew
RE: mistake by nephew
Yeah, Pat. What's a bowser?
Rod
RE: mistake by nephew
Nah, combustion is the reaction of the fuel with the air, regardless of when it happens in the cycle, or why it happens.
h
1 : an act or instance of burning
2 : a usually rapid chemical process (as oxidation) that produces heat and usually light; also : a slower oxidation (as in the body)
RE: mistake by nephew
RE: mistake by nephew
A.
RE: mistake by nephew
Cheers
Greg Locock
RE: mistake by nephew
RE: mistake by nephew
A fuel pump at a gas station would be a suitable translation, or a device for refuelling vehicles at a gas station, normally involving a trigger to control flow and a metre to determine cost, or even a tin thing as Greg suggests.
Getting back to the original question, despite any controversy over the definitions of combustion and detonation, I still say that petrol is higher octane than diesel fuel, and will be less inclined to ignite due to compression of the air in the cylinder, therefore a little in the diesel fuel will do no damage in a short low load trip.
If someone wants to continue about the rate of combustion of different fuels in a compression ignition engine, maybe they should, first do a site search, then start another thread on that subject.
Regards
pat pprimmer@acay.com.au
eng-tips, by professional engineers for professional engineers
Please see FAQ731-376 for tips on how to make the best use of Eng-Tips Fora.
RE: mistake by nephew
The knocking noise in a diesel engine at idle, has been called "cetane knock". And correct again about detonation in a diesel engine. The lower the cetane the fuel the more the engine would tend to knock. And with a slow flame front, like in a gas engine the unburned fractions explode under the heat and pressure. This happens even with good average cetane diesel fuel, on a modern engines.
A diesel engine will run on straight average gasoline, there are many brands of Multifuel diesel engines.