Fuel pump questions

[sfg]

...snip
> 
>   Yes, except that the fuel is heated by the engine.  If the fuel cap has no
> pressure release built in, the tank can build much pressure.
On a long off rd trip, my exhaust tip got bent so that the exhaust blew
directly on the tank. The (chev350 TBI) began to missfire so I stopped
to
check it out. When I removed the fuel cap, the release of pressure
lasted
several minutes. Engine ran normally after pres. was released......steve