The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post - Where to run gas tank vent line with tank moved to rear of truck?

**John Fabris** · 01-13-2009, 01:32 AM

Interesting, not much different then the way mine is set up, other then I have one less bend, but about 3-4" higher.
When you fill up, does the end of the gas pump filler tube sit lower then where the vent tube enters your truck's gas filler? (meaning when filler nozzle is inserted into your gas tank filler, does the end of the fill tube go past were the outgoing air vents meets the trucks filler tube?)

Only other question I could ask, is the gas filler hose under the bed level or inclined, and if inclined, towards tank or back towards fill upright tube?

Other then that, your set up only differs in the installation of the vacumn valve (mine is chemwelded to the top of the tank) but that has no relevance on filling tank.

Looking at your picture, I really want to say to verify that your vent tube to the filler has good flow and no blockage....

I hope you get this figured out. I have several friends with custom fill set ups, and slow fills are among their biggest compaints.....

Also, for clarification, when you guys have two vent hoses, is that two vents from the tank? or you you splitting one vent from tank into two?

01-13-2009, 01:32 AM	#8
John Fabris TOTY 2006 Join Date: Dec 1999 Location: Magalia CA USA Posts: 2,270	Re: Where to run gas tank vent line with tank moved to rear of truck? Interesting, not much different then the way mine is set up, other then I have one less bend, but about 3-4" higher. When you fill up, does the end of the gas pump filler tube sit lower then where the vent tube enters your truck's gas filler? (meaning when filler nozzle is inserted into your gas tank filler, does the end of the fill tube go past were the outgoing air vents meets the trucks filler tube?) Only other question I could ask, is the gas filler hose under the bed level or inclined, and if inclined, towards tank or back towards fill upright tube? Other then that, your set up only differs in the installation of the vacumn valve (mine is chemwelded to the top of the tank) but that has no relevance on filling tank. Looking at your picture, I really want to say to verify that your vent tube to the filler has good flow and no blockage.... I hope you get this figured out. I have several friends with custom fill set ups, and slow fills are among their biggest compaints..... Also, for clarification, when you guys have two vent hoses, is that two vents from the tank? or you you splitting one vent from tank into two? __________________ John Fabris 67 C10 SWB Last edited by John Fabris; 01-13-2009 at 01:40 AM.