The fuel pump relay on a Saab 900 is designed to regulate power to the fuel pump. When the ignition is turned to the "ON" position the power train control module energises the fuel pump relay causing its internal circuitry to close. When the relay's circuitry is closed it provides power to the fuel pump. As this relay ages, its internal circuitry wears out and can malfunction. A malfunctioning fuel pump relay can render the fuel pump inoperable, preventing the engine from starting. Replacement fuel pump relays are available from auto parts stores and certified Saab dealerships.
Place the Saab's transmission into park (if automatic) or first gear (if manual). Shut off the engine and set the parking brake.
Open the bonnet and find the under-hood relay centre. It is a small, black plastic box located between the battery and the driver's-side fender on the right side of the engine compartment.
Read the diagram on top of the relay centre cover. This diagram shows the location of the fuel pump relay within the relay centre.
Remove the relay centre cover and pinpoint the relay according to the diagram.