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Re: Gas smell
the other thing it may be is fuel evaproating from the carb after a hot engine is shut off. open the hood about an hour of sitting after the engine has done a normal drive and is up to operating temp. if you smell gas under the hood, an there are no leaks, then a fibre spacer under the carb may help to keep the carb from absorbing a bunch of engine heat.
otherwise check for any damp spots along the whole fuel line system from front to rear. sometimes a realy small seap can make a big smell, and it's a big fire hazard inside your garage. if it's attached to the house, even worse hazard.
if you can't find a source, and joedoh's answer doesn't fix it (you may wanna do that one anyway), what I have done in the past is put a small pressure in the tank, through the vent line, and see if it holds. if it doesn't hold then, again, start looking along the fuel lines, under tank straps, around the sending unit seal, the filler hose connections, etc etc. is your truck carbed, injected? is the tank mounted with some sort of rubber or shock absorbing material between the tank and the mounts? sometimes a tank can get a pin hole from how it was mounted, especially some of the newer really thin tanks.
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