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Tiny
GASSOMBUDDY
  • MEMBER
  • 1997 CHEVROLET SILVERADO
  • V8
  • 4WD
  • AUTOMATIC
  • 141,000 MILES
Hello again, Sorry to keep bothering you guys but, on the purge vac diagnostic switch there is another vac fitting on the left side of the switch.I dont know where it goes. If you could call me or I could call you I could explain it better. My # is 702-561-8073. Once again thankyou, JOE B.
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Tuesday, November 4th, 2008 AT 10:13 AM

13 Replies

Tiny
IMPALASS
  • MECHANIC
  • 3,112 POSTS
Hello,

Not that we won't call you but that isn't' the norm. . .. . .so lets try this one more time to see if this works for you.

Also, just a note. . .. . ..just so happens you got me again. That was by chance. We literally get thousands of posts and many of us work them. So to ensure we help you, please make sure you include all the info on your vehicle each time, otherwise it will waste your precious time on getting your vehicle back up and running and we don't want to give you the wrong data. I was able to look back and find your post but you never did in that one answer the specifics on your truck. Then I used a K2500 P/U, 4WD, V8-5.7L, VIN R. If this is not your vehicle please make sure you provide all that and the 8th digit of your VIN.

Okay, if I understand your question, you have two hose connectors on the purge vac diagnostic switch.

I have attached the pic again for the vehicle listed above. If you follow that, start with #2 the EVAP canister purge solenoid valve. A hose comes out of that and goes into one side of #1, the EVAP purge vacuum switch. From the other side of that switch, a long hose goes to the driver's side, most outside connection to #6, the EVAP canister Vent. From the inside of that vent, that hose goes to your fuel tank.

You sound frustrated on your email and I would be too. Vehicles not running right, needs inspection. . .. . .. . ..we understand. We will do our best to help you here. Try this first. If this doesn't work for you then get back with us and we will look at calling. But please ensure you have provided all of the detailed vehicle info first so that can be looked up and ready.

Hang in there Joe B. . .. . ...we'll get it.


https://www.2carpros.com/forum/automotive_pictures/248015_JPEG_1.jpg

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Tuesday, November 4th, 2008 AT 7:39 PM
Tiny
IMPALASS
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Hello Joe B

I was checking back with you to see how you are doing afte the post this morning?


https://www.2carpros.com/forum/automotive_pictures/248015_Graphic_2.jpg

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Wednesday, November 5th, 2008 AT 10:05 PM
Tiny
URB0123
  • MEMBER
  • 6 POSTS
There is a reference to "another vac fitting on the left side of the switch". I think gassombuddy has the same issue I do. I have a 1997 Chevy Suburban K1500 VIN 1GNFK16R4VJ329924

There are 3 vac fittings on the Purge Vac Diagnostic Switch, one goes to the EVAP CANISTER SOL VLV(which I translate to evaporative canister solenoid valve) another goes to the evap canister, and the third goes nowhere that I can tell. I did a replacement of the head gasket on this vehicle, and thought perhaps one of my five small children walked off with my well labeled vacuum hose or something. Maybe it really goes nowhere, but I was wondering if someone could confirm that.
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Wednesday, January 28th, 2009 AT 7:25 PM
Tiny
IMPALASS
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Hello -

I have received your question. I am really sorry but I am having some technical difficulty at this moment and unable to properly assist you so I have sent your post to one of our top moderators to assist you. So please hang on until he contacts you....... It won't be long!

Thank you
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Thursday, January 29th, 2009 AT 7:43 PM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Bob

This is what I got for a C1500 305/350 engine Vac Diag. that concern the last vacuum hose, it goes to the fuel tank as the vapor return line as illustrated below. Its been quite awhile since I did emission testing.


https://www.2carpros.com/forum/automotive_pictures/12900_evap_1.jpg

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Friday, January 30th, 2009 AT 2:18 PM
Tiny
URB0123
  • MEMBER
  • 6 POSTS
To clarify, there are 3 vac fittings on the "PURGE VACUUM DIAGNOSTIC SWITCH".

According to the diagram posted, there are 2. The vacuum diagram is identical to what I have under the hood.

I know where to connect the two shown on the label, but where does the third go? I think it will take someone who has either designed the danged thing, or actually eyeballed one to answer this.

And thank you for working on this still. I wish there was some way I could donate to this thread specifically, but I will just donate to the site generally.
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Friday, January 30th, 2009 AT 5:22 PM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
PURGE VACUUM DIAGNOSTIC SWITCH".

Do you have any no.S stamped on it? So we can cross reference it. I've been doing some checking on the rest of the engines it keeps giving the same diagram to include the 4.3L engine 6 cyl.
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Friday, January 30th, 2009 AT 5:55 PM
Tiny
URB0123
  • MEMBER
  • 6 POSTS
Thank you rasmataz,

I will take a look tonight or this afternoon and see if I can pull anything off of it. I don't usually access the net at home over the weekend, sorry about that.
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Monday, February 2nd, 2009 AT 10:40 AM
Tiny
URB0123
  • MEMBER
  • 6 POSTS


https://www.2carpros.com/forum/automotive_pictures/309300_Valve_shrunk_1.jpg



That is a picture of the PURGE VACUUM DIAGNOSTIC SWITCH. There is a number stamped on the bottom, 12556356, with the name FASCO. Also, as you can see, the number 6281 is stamped on the top.

The hose on the right goes to the canister, the hose beneath (in the photo, that is left of) the 6281 stamp goes to EVAP CANISTER SOL VLV, and then there is a rubber elbow fitting with no hose attached to it.
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Monday, February 2nd, 2009 AT 4:00 PM
Tiny
MRWELLER
  • MEMBER
  • 1 POST
I hate to dig up such an old topic/thread, but I too am wondering where the rubber elbow that comes off the passenger side of the Purge Vacuum Diagnostic Switch should be connected to? I have a 1997 Chevrolet K1500 with the 5.7L V8 and just did a tuneup with new plugs, wires, cap and rotor and discovered the elbow that was not connected to anything while I was working. Is this supposed to be hooked to something? Any help is appreciated.
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Monday, February 27th, 2012 AT 1:42 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
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Can you send a picture of what you are talking about?
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Thursday, July 19th, 2012 AT 12:07 PM
Tiny
RICHARD BROOKS2
  • MEMBER
  • 1 POST
That's the purge line or open to air port
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Wednesday, October 2nd, 2019 AT 2:49 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
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Excellent addition to this thread! Please feel free to help out whenever you are on the site :)
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Thursday, October 3rd, 2019 AT 11:38 AM

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