Yes you can be affected.

It depends on the wind and your speed as to how much gets sucked into
the cab. Having two side windows open can sometimes create a vacuum in
the vehicle allowing fumes to be sucked in through floorboard holes.
Having the fan on high can help, but....

Folks with Jeeps and soft tops have to really watch that. One friend
was falling asleep all the time while driving. Turned out he was
running with the soft top windows out, but the front door windows closed
thinking with the whole back open, no fumes would come in. I drove with
him and recognized the forehead pressure and sleepiness as carbon
monoxide poisoning pretty fast. He didn't really believe me. He ended
up passing out on a straight dry road and rolling his Jeep into the
ditch. Luckily he wasn't hurt bad. He still doesn't know 'what
happened'.....

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
Canadian Off Road Trips Photos: Non members can still view!
Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
(More Off Road album links at bottom of the view page)



wrote:
>
> I just recently began driving a rather old and beat-up ice cream truck
> and lately I have been having some headaches. This truck, which is due
> for inspection in a few months and uses gasoline as fuel doesn't run
> too well.
>
> Here are a few questions.....
>
> Can you be adversely affected by fumes in a vehicle that has it's
> windows open and numerous holes throughout the body of the truck? I
> always keep the windows open and the truck is far from airtight.
>
> Thanks
>
> LT