GMCforum
For enthusiast of the Classic GMC Motorhome built from 1973 to 1978. A web-based mirror of the GMCnet mailing list.

Home » Public Forums » GMCnet » Fuel Vapor Separator (Test)
Fuel Vapor Separator [message #98075] Wed, 01 September 2010 13:36 Go to next message
Oldngray is currently offline  Oldngray   United States
Messages: 544
Registered: August 2009
Location: Punta Gorda Florida
Karma: 0
Senior Member
I removed my Separator and it looks like new. I blew through the bottom (large) tube and could not get any air out the top, assume that it is working properly.
What is the purpose of this item and is it reasonable to bypass it and connect back to the Fill tube?
I filled my tanks to the top, without the Separator installed and did not get any leaks, so I am going to look at the multiple hose connections from the tank to the separator, one of them must be loose.

All suggestions would be appreciated.


Richard MacDonald Punta Gorda, Florida Sold our TZE April 2015
Re: Fuel Vapor Separator [message #98079 is a reply to message #98075] Wed, 01 September 2010 14:08 Go to previous messageGo to next message
Bob de Kruyff   United States
Messages: 4260
Registered: January 2004
Location: Chandler, AZ
Karma: 1
Senior Member
Oldngray wrote on Wed, 01 September 2010 12:36

I removed my Separator and it looks like new. I blew through the bottom (large) tube and could not get any air out the top, assume that it is working properly.
What is the purpose of this item and is it reasonable to bypass it and connect back to the Fill tube?
I filled my tanks to the top, without the Separator installed and did not get any leaks, so I am going to look at the multiple hose connections from the tank to the separator, one of them must be loose.

All suggestions would be appreciated.


It is there to prevent raw fuel from getting into the charcoal cannister and loading it full of fuel. That can happen when you top off the tanks since that path is the primary vent for the fuel system. I would leave it in place especially since it seems to be working.


Bob de Kruyff
78 Eleganza
Chandler, AZ
Re: Fuel Vapor Separator [message #98087 is a reply to message #98079] Wed, 01 September 2010 14:52 Go to previous messageGo to next message
Keith V is currently offline  Keith V   United States
Messages: 2337
Registered: March 2008
Location: Mounds View,MN
Karma: 0
Senior Member
The bottom is the small tube, the top is the large tube.

It should be installed to you can blow into the small tube and have the air come out the top.

But if you pump fuel into the bottom, the ball inside floats and THEN shuts off the flow out of the top.


Keith Vasilakes
Mounds View. MN
75 ex Royale GMC
ask me about MicroLevel
Cell, 763-732-3419
My427v8@hotmail.com
Re: Fuel Vapor Separator [message #98091 is a reply to message #98087] Wed, 01 September 2010 15:31 Go to previous message
Oldngray is currently offline  Oldngray   United States
Messages: 544
Registered: August 2009
Location: Punta Gorda Florida
Karma: 0
Senior Member
I guess I had it backwards, (top/bottom) blowing in the small tube allows air passage while the other way the air is blocked. I will be sure to install it right side up.
Thanks


Richard MacDonald Punta Gorda, Florida Sold our TZE April 2015
Previous Topic: [GMCnet] starter problem - where is it
Next Topic: Dash repairs, re-covering- Photo Site
Goto Forum:
  


Current Time: Sun Nov 17 18:42:33 CST 2024

Total time taken to generate the page: 0.02009 seconds