No fuel pressure

Tiny
KARL KEONE
  • MEMBER
  • 2009 GMC YUKON
  • 5.3L
  • V8
  • 4WD
  • AUTOMATIC
  • 115,000 MILES
My vehicle ran out of gas and now it will not start. I dropped the tank to check the fuel pump. I have checked all the relays, all the fuses, all the grounds cleaned them, yet still not getting fuel or pressure. I originally drained the fuel rail line and it was even worse and then I do not know, but through everything and trying to crank it somehow it almost started and I thought maybe I will just drain the air out again and then I will fix it it will once I did. Now again has no pressure not getting pressure I can hear the pump test at the pump. I have read everything. I do not know what the issue is that I did not check. Seems like the module I do not think you can connect the wires on that was wrong still no start paying for it and it is just sitting there. It has been about a month. Has funny a crank check the starter the solenoid the only thing I am not 100% positive about is the Navy oil pressure something about four pounds of pressure to even turn over and start. I think my computer is stuck so it is telling it that it has fuel and I do not know how to reset the PCM correctly or if this is something that I might actually just have to take to a dealer and have them manually reenter all the specification codes for my vehicle.
Sunday, November 13th, 2016 AT 11:09 PM

5 Replies

Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 POSTS
In tank fuel pumps are cooled and lubricated by the fuel in the tank. When you run a car out of gas or very low, it pumps a lot of air through the pump which overheats it and causes some severe wear and many times, failure when they cool off.
You will need to use a fuel pressure gauge to verify this.
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Monday, November 14th, 2016 AT 5:09 AM
Tiny
RENEE L
  • ADMIN
  • 1,260 POSTS
Hello KARL,

Here is a link to really helpful information from this site on testing fuel pressure. If you decide you would like do this yourself you can purchase a fuel pressure gauge online from sites like Amazon.com.

https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator

Thank you for visiting 2CarPros.com.

Kindest regards,

Renee
Admin
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Monday, November 14th, 2016 AT 1:53 PM
Tiny
KARL KEONE
  • MEMBER
  • 3 POSTS
I pulled the pump and tested it directly to a battery, also put a pressure tester on it and it nottomed it out every time I turned it on. So I assume the pump is actually fine. Problem seems to arrise and be the worst every time I bleed the fuel rail (only bleed it 2 times) I'm curious if this has something to do with the styochiomatic flow, the oil sending unit, or a bad PCM. Or it I simply just need to reset my PCM because all the relays have improper styochiomatic flow strored and it's not reaching the 14:7.1
or what else might it be?
Seems I've read, watched and tried everything. STUMPED
it will start with gas/starting fluid (only did once as I know how bad it can be for and on your engine) and die immediately.
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Tuesday, November 15th, 2016 AT 5:50 PM
Tiny
KARL KEONE
  • MEMBER
  • 3 POSTS
New battery. Checked all grounds and cleaned, checked all fuses, all relays, all wires and connectors. Dropped and cleaned out tank. As well as pulled fuel filter, directly hooked power and fuel pressure gauge to it, bottomed gauge out every time. Like 140psi, you can hear pump kick on, but just for a split second, and not 2 seconds, yet sometimes a bit longer than the other(another reason why I believe my 14:7.1 in the PCM needs to be reset, which I dont know how to do. Think something about unhooking power from battery and running an alligator clip to both) I havent't checked the crank sensor, or oil preesure sensor (although for some reason I did initially reset the oil life on my instrument cluster, which assume wouldn't effect my car not starting or my PCM relays or the ECM. Or the module. I assume because fuel pump work the module is working, especially casue I can normally hear it kink on and over with the key in ON positiont, oh and the fuel pressure regulator cause i'm not sure where it's at/if it matters with the EFI fuel injection system. N last I recheked everything(it seems) and pulled the 2 fuel line connectors off the bottom of car (the ones that connect to the front of fuel pump on top of fuel tank) this time tried to turn key to ON position, heard pump briefly however still no fuel was pushed into the lines or system
i just can't seem to manage to find out a way to get fuel, or pressure into the fuel line system from the tank. Another reason why I assume PCM stored data needs to be reset.
It has about started, both times, until I bled air out of the fuel system on the top of the fuel rail? Just stumpted. Oh I checked the starter and solenoied and replaced as well, even though they tested good. PLEASE HELP ANYONE THANKS
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Tuesday, November 15th, 2016 AT 6:13 PM
Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 POSTS
You need to put that pump back together and start using the fuel pressure gauge as advised. Then and only then can you find out if the circuit has any issues.
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Tuesday, November 15th, 2016 AT 6:13 PM

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