Failure to Start

• The fuel pump relay, if faulty, may not activate the fuel pump when the key is turned into the "start" position. This can result in the engine cranking but failing to start. Replacing the faulty fuel pump relay typically corrects the problem.
  
  

Delayed Start

• A malfunctioning fuel pump relay may take longer than normal to activate the fuel pump. This causes a delay in engine starting and possible erratic functioning of the engine after start-up.
  
  

Quiet Fuel Pump

• Fuel pumps make a buzzing noise during operation. A nonworking pump, resulting from a failed fuel pump relay, remains silent. A driver with a trained ear can often notice the lack of pump noise during engine start-up, which can help lead him to the underlying issue.