How to test a fuel pump?

[vissine]

Has anyone performed a test to diagnose if a fuel pump is having problem? I think I have fuel pump problem but don't want to replace it randomly. 

[paulo57509]

12 hours ago, vissine said:

Has anyone performed a test to diagnose if a fuel pump is having problem? I think I have fuel pump problem but don't want to replace it randomly. 

This is a pretty general statement.  What makes you think you have a fuel pump problem?  Can you describe the symptoms?

[sha4000]

You would have to remove the back seat and test power to the connector.

[vissine]

21 hours ago, paulo57509 said:

This is a pretty general statement.  What makes you think you have a fuel pump problem?  Can you describe the symptoms?

Car cranks, but does not turn over. It could be a dead pump or clogged filter. At least, that's what I am thinking. I don't hear the hum noise when ignition key is at On position although I hear the clicking sound of the relay. I normally didn't notice that hum noise anyway. I haven't got time to troubleshoot so come here to brainstorm first. There is no symptom, it's just cold dead. I am looking into connecting a gauge to test the fuel pump before replacing it. It's just that I haven't done it before so I don't know which port on the fuel rail that I need to tap into.

[vissine]

17 hours ago, sha4000 said:

You would have to remove the back seat and test power to the connector.

Can you hear the hum noise in your car when the key is at ON position? 

[vissine]

Hello friends,

So, I have time to take a look at the car (been social distancing, so I don't need to drive to anywhere). Anyway, I was able to check the fuel pressure gauge, lucky enough, I did not see anything. At this point, I don't even care to crank it because the pump maybe a problem or circuitry. I didn't check the spark because it takes some times to remove stuffs and I have to take care of the pump anyway. First thing first.

First, I remove the pump relay and check the circuit there: zero, no voltage at all. But, before reaching the fuel pump relay, the battery voltage needs to pass through the Circuit Open relay. I went a head and remove the Circuit Open relay and check there, all the voltages are ready to go.

At this point, I was thinking "maybe the Circuit Open relay is defect". I pulled out my tool to get some electrical wires for connection and try to confirm which one is bad. 

Sure enough, the CIrcuit Open relay was good, Fuel Pump relay was dead. 

I went to Advance auto parts to buy the relay, plugged in and the car was alive again. 

 

[paulo57509]

Thanks for closing the loop and posting your fix.