Fuel pressure

Tiny
ASEMASTER6371
  • EXPERT
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
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Tuesday, September 1st, 2020 AT 3:54 AM
Tiny
PACIFICISLANDER
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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.
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Tuesday, September 1st, 2020 AT 2:45 PM
Tiny
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I will be here for you.

Roy
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Tuesday, September 1st, 2020 AT 2:52 PM
Tiny
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Thank you.
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Tuesday, September 1st, 2020 AT 6:27 PM
Tiny
PACIFICISLANDER
  • MEMBER
I use to work with you once upon a time, keep it on the down flow-lol.
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Tuesday, September 1st, 2020 AT 6:28 PM
Tiny
ASEMASTER6371
  • EXPERT
Really? Where and when?

You are welcome.

Roy
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Wednesday, September 2nd, 2020 AT 3:55 AM
Tiny
PACIFICISLANDER
  • MEMBER
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
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Wednesday, September 2nd, 2020 AT 3:14 PM
Tiny
ASEMASTER6371
  • EXPERT
Well, that makes sense. The residual fuel is what is burning.

Tell him hello. Wish we had him back.

Roy
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Wednesday, September 2nd, 2020 AT 3:26 PM
Tiny
PACIFICISLANDER
  • MEMBER
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.
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Wednesday, September 2nd, 2020 AT 5:50 PM
Tiny
ASEMASTER6371
  • EXPERT
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

imageOpen In New TabZoom/Print

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

imageOpen In New TabZoom/Print

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.

imageOpen In New TabZoom/Print

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.

imageOpen In New TabZoom/Print

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

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Thursday, September 3rd, 2020 AT 3:59 AM
Tiny
PACIFICISLANDER
  • MEMBER
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.
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Thursday, September 3rd, 2020 AT 5:05 PM
Tiny
ASEMASTER6371
  • EXPERT
If it checks out okay, does that mean you have power to the pump? That does not make sense.

Roy
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Thursday, September 3rd, 2020 AT 5:08 PM
Tiny
PACIFICISLANDER
  • MEMBER
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.
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Thursday, September 3rd, 2020 AT 5:10 PM
Tiny
ASEMASTER6371
  • EXPERT
Okay, that does not explain the relay checking out.

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

Roy
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Thursday, September 3rd, 2020 AT 5:14 PM
Tiny
PACIFICISLANDER
  • MEMBER
I got another relay for it just in case.
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Sunday, September 6th, 2020 AT 3:27 PM
Tiny
ASEMASTER6371
  • EXPERT
Okay, let me know when you can give me the readings at the relay.

Roy
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Sunday, September 6th, 2020 AT 4:01 PM
Tiny
PACIFICISLANDER
  • MEMBER
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?
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Sunday, September 6th, 2020 AT 4:14 PM
Tiny
ASEMASTER6371
  • EXPERT
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
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Sunday, September 6th, 2020 AT 4:18 PM
Tiny
PACIFICISLANDER
  • MEMBER
The STA and B+ has power on the connector.
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Monday, September 7th, 2020 AT 2:37 PM
Tiny
ASEMASTER6371
  • EXPERT
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
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Monday, September 7th, 2020 AT 2:52 PM

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