blower fan switch dosnt work

[1993GAGT]

i have a 1993 grand am gt coupe with a 3.3 v6 the blower fan switch dosnt turn on high but the other 3 settings work just fine... also i heard that if the oil sending unit goes bad then the fuel pump wont work.... well my oil sendin unit i think is bad and just today the fuel pump stopped working... i want to know the dificulty of changing it if its in the tank or inline.. thanx

[swalt]

The fan speed is likely the blower resistor. Its mounted on the firewall about middle of the engine compartment halfway down the engine compartment. Normally a failed resistor though will stop working on the 3 low speeds and bypass the resistor for high speed so if you have a failure you can still blow the windows on high. Check the dash switch first. As far as the pump, you need to drop the tank.