Cadillac Repair: 84 caddy coupe de ville, electric fuel pump, fuel pump relay

Question
Hi hope you can help.I have a 84 coupe de ville with the 4100 engine. I cant get the car to start. It turns over but will not start. I dont see the injectors spraying so I thought it was the fuel pump but i already replaced it and still no luck. However when I first installed the fuel pump I could hear it whirring now I dont could I have blown the fuel pump. When it did whirr the tank was empty and after I put gas in the car I tried to start it but no luck,still no spray.Can you help. Thanks


Answer
You NEVER run an electric fuel pump when it has no fluid to pump as you can burn it up.

Fuel pump test:

1. Get yourself a helper.

2. remove the gas cap.

3. have one person listen in the gas tank at the gas cap opening.

4. have the other person turn the ignition switch to the ON position ONLY so as the dash lights come on. Do NOT attempt to start the engine.

5. As soon as the ignition key is turned to the ON position, The person at the gas tank should hear the fuel pump run for TWO SECONDS and then it should STOP.

6. Does it ?.


If you do NOT hear it run, in most cases the fault is the fuel pump relay or the fuel pump..



let me know.