Welcome to the site Jaffinator,
The air filter is in a fair sized box behind the drivers side headlight.
The fuel filter is on the fuel line between the fuel tank and the engine, you'll have to look.
The fuel pump relay is located behind the power brake boster/master cylinder, the one on the right on the firewall on my '92.
The fuel pump is inside the fuel tank.
Here's where you check the fuel pressure, the spec is 55psi+
Turning the keyswitch On runs the fuel pump for a few seconds and the pressure should hold for several minutes if the check valve is holding.
The fuel level sensor is terrible on these, it's possible there's no fuel in the tank.