Duramax Diesels Forum Truck of the Week
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Old 06-16-2010, 05:46 PM
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Default Schrader Test Port

So I was looking at the schrader test port on my truck to see if it was a good place to tap in for a fuel pressure gauge. I popped the cap off and noticed it has fuel in there plus it was bubbling Is this normal or anything I should be worried about?
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Old 06-16-2010, 05:51 PM
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Clean it out and see if it comes back might of been in there from the last time gm used it

if your going to use that to tie into just remove the valve an hook to the hose behind it using a barb fitting
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Old 06-16-2010, 05:54 PM
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Quote:
Originally Posted by sweetdiesel View Post
Clean it out and see if it comes back might of been in there from the last time gm used it

if your going to use that to tie into just remove the valve an hook to the hose behind it using a barb fitting
How long do you think fuel would stay there? I have owned the truck for 3 years now and havent had it to a dealer once. Also what about the bubbles?
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Last edited by 03-GMC; 06-16-2010 at 05:55 PM.
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Old 06-16-2010, 06:05 PM
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I got a fitting from Tony B that replaced that valve, and it was quick and easy, and my autometer 15psi fuel gauge plugged right in. Simple 10 minute job.
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Old 06-16-2010, 06:06 PM
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Quote:
Originally Posted by 03-GMC View Post
How long do you think fuel would stay there? I have owned the truck for 3 years now and havent had it to a dealer once. Also what about the bubbles?

its common for fuel to be there and some bubbles its the air bleeder port it burps its self as it needs to.
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Old 06-16-2010, 06:58 PM
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be careful when you unscrew the schrader valve. Mine snapped off when I was trying to do the same thing.

Attachment 11662Attachment 11663
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Old 06-16-2010, 07:00 PM
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Quote:
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be careful when you unscrew the schrader valve. Mine snapped off when I was trying to do the same thing.

Attachment 11662Attachment 11663
So I can either unscrew it of take it off completely?
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Old 06-16-2010, 07:02 PM
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You can buy a schradervalve adapter but I think those are upwards of $100, or you can unscrew the actual vavle off the fuel line, it would be much cheaper to get an adapter fitting on the fuel line threads than adapting to the schradervalve. MMLMM could probably tell you the thread pitch if you needed a fitting
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Old 06-16-2010, 07:13 PM
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A barb fitting is like 50 cents lol
ditch the whole thing and be done with it
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Old 06-16-2010, 07:33 PM
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Quote:
Originally Posted by sweetdiesel View Post
A barb fitting is like 50 cents lol
ditch the whole thing and be done with it
Yep sounds like I am going the cheap route for sure. Thanks for the help
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Old 06-16-2010, 07:41 PM
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Be careful
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Old 06-16-2010, 08:21 PM
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Quote:
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Be careful
Be carefull about what?
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  #13  
Old 06-16-2010, 08:28 PM
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about unscrewing the valve from the rail
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Al gore invented driving the turbo.
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Old 06-16-2010, 08:48 PM
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Quote:
Originally Posted by x MadMAX DIESEL View Post
about unscrewing the valve from the rail
A 12 mm deep socket to remove the 2 nuts and a pair of pliers to remove the hose clamp

there is nothing connected to the rail
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  #15  
Old 06-16-2010, 08:54 PM
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Quote:
Originally Posted by sweetdiesel View Post
A 12 mm deep socket to remove the 2 nuts and a pair of pliers to remove the hose clamp

there is nothing connected to the rail
I didnt mean to say rail, sorry. Be careful when using a 7/8 wrench on the schrader valve trying to unscrew from the aluminum fuel line. Use PB blaster on it to be sure you don't mess it up like me


But what are you talking about?
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