1994 Mitsubishi Expo heater fan quit, fuse is ok.

depends on what is found to be faulty
solenoid , valve or body

They are on different fuses. Most likely your light switch has failed. This is the only point that both lights go to.

I think they are under the bonnet on these follow the fuel lines back from the engine

The test port is on the fuel rail that supplies the fuel injectors on the top of the engine.

Relieve the fuel rail pressure by removing the fuel pump fuse, then cranking the engine for a few seconds until it is clearly not receiving any fuel. Next let off the pressure in the fuel tank by removing then replacing the fuel filler cap. Next unfasten the special connectors which join the fuel line to either side of the fuel filter and disconnect the lines, keeping a rag handy to catch the fuel which will spill out of the lines and filter. Remove the fuel filter mounting bracket bolts/screws then replace the filter. Reassembly is the reverse of removal.

the torque convertor clutch solenoid in the tranny is full of junk! / metal shavings starving the tranny from the front pump while in O/D

Use a wrench on the bolt through the idler pulley to raise up on the pulley and take the tension off of the belt. There should be a schematic for the routing of the belt on the fan shroud, If not, draw one before you remove the belt. Don't rely on memory.

Usually this is because a slow leak where the sensor will not allow pump to run dry. Slow leaks can get expensive when parts are needed. I'd guess $500 to start.

it is an internal fuel pump located underneath the back seat..

Get a can of intake cleaner from any local parts store, not carb spray, intake cleaner, it is made by a company called CRC, remove the air intake hose to the engine, hold the idle high so the engine won't stall, then spray the can of cleaner into the intake while keeping the engine running, use at least 1/2 the can, shut down the engine and disconnect the battery for 5 minutes, then restart and complete a number of mixed driving cycles, town, freeway, stop and go etc., after a few days the problem will go away as the system will relearn to the clean intake