On Wed, 26 Jun 2002, Alan B. Pearce wrote:

>I believe a vehicle exhaust is likely to have enough unburnt fuel in it to
>still be able to have an explosive mixture in the tank, especially if it
>condensed on the inside of the tank, and so was able to build up a suitable
>concentration.

No. Just run the throttle suitably closed and avoid extra air intake. A
wet towel around the exhaust hose into the tank is rumored to be enough.
There is very simple proof to disprove what you claim (hint: the ignitable
mixture range *widens* with higher mixture pressure/temperature, as in,
inside *running* engine cylinders, therefore exhaust is not ignitable by
definition).  Condensation is of no concern if there is not enough oxygen.
There should be enough fuel in the tank from residues anyway. Of course
you use this information at your own risk ... and if there is any suitable
catalyst in the tank then any and all bets are off ...

Peter

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