| My Fuel Tank Isolation system [message #73162] |
Sun, 07 February 2010 11:46  |
jwillard
Messages: 118
Registered: May 2004
Location: Silver City, NM
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Several folks have asked me about this and I finally got pictures up on the photo site.
http://www.gmcmhphotos.com/photos/showgallery.php?cat=5396
Unfortunatly, I can't find the pics I took years ago when I built and installed this. I hope you can get the idea from the installed pictures. I found an aircraft fuel "slide Valve" with an 1 1/4" valve. I split the GMC fill pipe between the tanks and installed the valve and tucked it up in the frame rail. Tight fit there. I used an Air Cylinder to open the valve and a spring to close it. Had I to do it again, I'd use a double acting cylinder to close it. I have a toggle switch in the fuel port that runs the 12v air solonoid to open the valve.
When I stop for fuel I open the valve which allows both tanks to fill. Once full I close it and it isolates the tanks. I always start running with the AUX tank, which is the front tank. That way, if I stop for fuel early, I just leave the vavle closed and it only fills the front tank.
This mod really works well and allows for true fuel management. Unfortunatly, finding the valve could be a crap shoot. Keep your eyes open though. They're out there.
Jeff Willard
Silver City, NM
1973 ex-Glacier
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