Another OPV question

I've decided to replace this part because my car exhibits so many of the symptoms I've read about here. Primarily, it starts great when cold, but will not start when warm unless the acclerator is depressed. My probelm is that I can't locate it. I've read on this board and on my Alldata CD that it should be located "behind the battery", but there is nothing behind my battery but firewall.

My car's exhaust smells very much like unburnt gasoline. As a control function, could the OVP cause that?

Thanks for all your valuable advice.

Darrell