Where do you find and how do you replace the fuel pump relay on a 1991 Ford Mustang LX 2.3L?
The relay in the engine compartment. It's on the passenger side mounted on the fenderwell just in front of the strut tower.
Actually, it's located in the CCRM (constant control relay module) which is in behind the passenger front fender. It is a module with 5 relays (AC, Fuel pump, etc..). You can try to replace the relay ($10), the module used ($50-70) or buy brand new ccrm from Ford for $240. Your call. Get a wire diagram of the ccrm and replace the right relay if you go that route.
The 2000 Ford Mustang fuel pump relay is located in the CCRM (Constant Control Relay Module). It is located inside the inner front left (passenger-side) fender. Please note, the CCRM also houses other relays such as the PCM power relay, fan, relay, ect. and thus on relay cannot be replaced... the entire assembly must be replaced if one of any of the relays go bad.