Fuel pressure

It is not sucking fuel at all. It is under pressure, not a vacuum.

None of this makes any sense at all. Without power there should be no pump operation and no fuel and the engine should not run.

If there is fuel in the lines with it disconnected, power is being provided from another source.

Roy

Let me double check again and let you know as soon as I can. Hang in there we'll figure this out one way or the other.

I will be here for you.

Roy

Thank you.

I use to work with you once upon a time, keep it on the down flow-lol.

Really? Where and when?

You are welcome.

Roy

My friend here in 2car called rasmataz-lol and here I am asking for help

Okay here it goes again: when pump and return line is connected it will throw fuel out but when you disconnect the pump it stay running for a while in low idle and then shuts off. Thanks

Well, that makes sense. The residual fuel is what is burning.

Tell him hello. Wish we had him back.

Roy

That's what I'm thinking of, maybe we should go different direction on this issue. What's are first start? 2 brand new fuel pump already nothing seems to be happening.

I attached the wiring for this. Can you go to the fuel pump relay and we can do some testing?

https://www.2carpros.com/articles/how-to-check-wiring

https://www.2carpros.com/articles/how-to-check-an-electrical-relay-and-wiring-control-circuit

I attached the testing below and some pictures.

Roy

CIRCUIT OPENING RELAY INSPECTION

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1. REMOVE CENTER CLUSTER FINISH LOWER PANEL
2. REMOVE FINISH LOWER CENTER PANEL
3. REMOVE CIRCUIT OPENING RELAY

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4. REINSTALL EFI MAIN RELAY
A. Inspect relay continuity
Using an ohmmeter, check that there is continuity between terminals STA and E1.
If there is no continuity, replace the relay.
Check that there is continuity between terminals +B and FC.
If there is no continuity, replace the relay.
Check that there is no continuity between terminals +B and FP.
If there is continuity, replace the relay.

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B. Inspect relay operation
Apply battery voltage across terminals STA and E1.
Using an ohmmeter, check that there is continuity between terminals +B and FP.
If there is no continuity, replace the relay.
Apply battery voltage across terminals +B and FC.

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Check that there is continuity between terminals +B and FP.
If there is no continuity, replace the relay.
5. REINSTALL CIRCUIT OPENING RELAY
6. REINSTALL FINISH LOWER CENTER PANEL
7. INSTALL CENTER CLUSTER FINISH LOWER PANEL

The COR checks out okay. What's next Roy? Man this a headache. Why the COR what does it control? Fuel pump is being powered by it. Next step, hope its not pin to pin on the computer might as well get a computer box.

If it checks out okay, does that mean you have power to the pump? That does not make sense.

Roy

I have another power going to the pump in case it's needed with the blue wire at the pump and ground on the white.

Okay, that does not explain the relay checking out.

What are the voltages at the relay? What terminals have power?

Roy

I got another relay for it just in case.

Okay, let me know when you can give me the readings at the relay.

Roy

This is what I got so far: I disconnect the fuel pump started up then remove COR it continues to run, but how's that I haven't check the power on the COR connector? What do you think just replacing it?

I asked you before to check the voltages at the relay. I need those reading. This is the beginning of the diagnostic.

Do not replace any parts. Let us find out why it is not working.

Roy

The STA and B+ has power on the connector.

With the relay out, there should be one wire with battery voltage.

There should be a second wire with voltage but it will be present for only 2 seconds. It will have full voltage while cranking.

Can you verify?

Roy