A note on the fuel pump - it will not prime with key-on like most cars. The pump only runs when the VAF is open, so only when the engine is cranking/running. It's a "safety" feature
There's a rollover safety switch in the trunk, on the left side of the donut on the frame rail. Sometimes big bumps or potholes can trigger it. If it needs to be pushed back in, it was cutting power to the pump.
The fuel filter is right on the firewall, easy to get to & replace.