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Fuel rail compression valve

Tiny
JOSELUNA01
  • MEMBER
  • 2004 GMC ENVOY
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 120,000 MILES
If you see in this diagram for a 2004 gmc envoy 6 cyl. There is no compression on valve item #12 in the following link. Is this the fuel rail valve that I need to check psi from? I checked the valve that is by the fuel filter for the fuel pump and there is enough compression there. So question is, is item #12 the fuel rail valve I need to be checking?
please email me at jose_moon24@yahoo. Com
items checked
coils- good ohms reading there
replaced coil boots
replaced spark plugs
cleaned out throtle body
before I check the fuel injectors I would like to know if item 12 is the fuel rail valve. Please advice, thank you! All the information found in your website is awesome!
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Friday, July 8th, 2011 AT 7:31 PM

5 Replies

Tiny
WRENCHTECH
  • MECHANIC
  • 20,757 POSTS
I have no idea what you're looking for but item 12 is just a vapor line and doesn't even carry fuel.
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Friday, July 8th, 2011 AT 7:48 PM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
You're probably looking for the fuel test port-does it look like a tire valve-If there's no pressure at the port-best check the fuel pressure with a gauge, to rule out the fuel filter and fuel pump-
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Friday, February 3rd, 2012 AT 7:36 PM
Tiny
WRENCHTECH
  • MECHANIC
  • 20,757 POSTS
July?
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Friday, February 3rd, 2012 AT 8:45 PM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Wow! How did that happened-it pop up and I answered it-didn't realized the date-thought it was a new thread
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Friday, February 3rd, 2012 AT 9:24 PM
Tiny
WRENCHTECH
  • MECHANIC
  • 20,757 POSTS
Site has been acting real weird lately.
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Friday, February 3rd, 2012 AT 9:33 PM

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