Probably, I do not think just opening the gas cap will cover it. The easiet way to do it is to buy a fuel pressure guage that has a bleed off valve, the next way is to use the saftey (inertia switch). Here's how I did it according to the Haynes manual. Locate the inertia switch behind the kick panal, unplug the connector, start the motor and let it run until it stops (just a few seconds), change your filter, plug the connector back up and you should be ready to go. If the inertia switch has popped just push the reset on the top.
By the way, I like your truck, never seen one that color before.