Anyone else have fuel vapours coming.from filler neck ? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

72MARIO · 08-09-2016, 11:39 PM

I completed my ls swap using a in tank fuel module from a 2003 truck. The system has a feed and return line. I am finding that there is now a excessive amount of fuel vapour coming from the vented gas gap. I have a 1/4" line from the intake thats capped down at the transmission and a 1/4" line from the fuel module. Has anyone run thoes lines into a charcoal can and used the factory valve in the intake to vent the system ?

ls1nova71 · 08-10-2016, 03:47 AM

The PCM wont Open the purge solenoid unless certain criteria are met, and in a swap you most likely dont have everything hooked up for that to happen. I just hook the vent line from the tank to the charcoal cannister and leave the other fittings on it open. I dont get any fuel smell that way.

**Hart_Rod** · 08-10-2016, 11:36 AM

Quote:

Originally Posted by ls1nova71

The PCM wont Open the purge solenoid unless certain criteria are met, and in a swap you most likely dont have everything hooked up for that to happen. I just hook the vent line from the tank to the charcoal cannister and leave the other fittings on it open. I dont get any fuel smell that way.

Does someone make an aftermarket canister?

BR3W CITY · 08-10-2016, 05:20 PM

The S10/Jimmy charcoal "box" is cheap and at every junkyard if you really need it.

72MARIO · 09-11-2016, 07:07 PM

So I am thinking about adding the charcoal can....The smell of fuel vapors at stop lights in town is actually concerning me if someone threw the butt near my Suburban. I don't know what would happen.

Does anyone know if the newer say 71 72 trucks came with a Non-vented cap for the tank ?

BR3W CITY · 09-12-2016, 10:48 AM

Nothing would happen, you'd never achieve a functional a/f ratio. People smoke at gas stations all the time (not a good idea, but totally happens). They'd have to toss their butt on the trim of your filler neck, and even then, probably nothing.

08-09-2016, 11:39 PM	#1
72MARIO Registered User Join Date: Nov 2000 Location: Huntsville Ontario Canada Posts: 4,051	Anyone else have fuel vapours coming.from filler neck ? I completed my ls swap using a in tank fuel module from a 2003 truck. The system has a feed and return line. I am finding that there is now a excessive amount of fuel vapour coming from the vented gas gap. I have a 1/4" line from the intake thats capped down at the transmission and a 1/4" line from the fuel module. Has anyone run thoes lines into a charcoal can and used the factory valve in the intake to vent the system ? __________________ 1968 Suburban numbers matching all original truck now equipped with 6.0/4L80 on Accuair http://67-72chevytrucks.com/vboard/s...d.php?t=625017 1967 C/20 6.0/4L80 Roofing Truck 1990 V2500 Suburban "Plow Truck" 2005 TAHOE DD

08-10-2016, 03:47 AM	#2
ls1nova71 Registered User Join Date: Dec 2009 Location: Independence Mo Posts: 4,119	Re: Anyone else have fuel vapours coming.from filler neck ? The PCM wont Open the purge solenoid unless certain criteria are met, and in a swap you most likely dont have everything hooked up for that to happen. I just hook the vent line from the tank to the charcoal cannister and leave the other fittings on it open. I dont get any fuel smell that way. __________________ My '72 short bed build. http://www.ls1tech.com/forums/conver...6-0-4l80e.html 5.3 swap into my RUSTY '71 C10 http://ls1tech.com/forums/conversion...71-c-10-a.html

08-10-2016, 05:20 PM	#4
BR3W CITY meowMEOWmeowMEOW Join Date: Sep 2009 Location: MKE WI Posts: 7,128	Re: Anyone else have fuel vapours coming.from filler neck ? The S10/Jimmy charcoal "box" is cheap and at every junkyard if you really need it. __________________ *'66 Short Step / SD Tuned / Big Cam LQ4 / Backhalfed /Built 4l80e / #REBUILDEVERYTHING* MY BUILD THE H8RDCPTR //\\ MY YOUTUBE CHANNEL REV J HD

09-11-2016, 07:07 PM	#5
72MARIO Registered User Join Date: Nov 2000 Location: Huntsville Ontario Canada Posts: 4,051	Re: Anyone else have fuel vapours coming.from filler neck ? So I am thinking about adding the charcoal can....The smell of fuel vapors at stop lights in town is actually concerning me if someone threw the butt near my Suburban. I don't know what would happen. Does anyone know if the newer say 71 72 trucks came with a Non-vented cap for the tank ? __________________ 1968 Suburban numbers matching all original truck now equipped with 6.0/4L80 on Accuair http://67-72chevytrucks.com/vboard/s...d.php?t=625017 1967 C/20 6.0/4L80 Roofing Truck 1990 V2500 Suburban "Plow Truck" 2005 TAHOE DD

09-12-2016, 10:48 AM	#6
BR3W CITY meowMEOWmeowMEOW Join Date: Sep 2009 Location: MKE WI Posts: 7,128	Re: Anyone else have fuel vapours coming.from filler neck ? Nothing would happen, you'd never achieve a functional a/f ratio. People smoke at gas stations all the time (not a good idea, but totally happens). They'd have to toss their butt on the trim of your filler neck, and even then, probably nothing. __________________ *'66 Short Step / SD Tuned / Big Cam LQ4 / Backhalfed /Built 4l80e / #REBUILDEVERYTHING* MY BUILD THE H8RDCPTR //\\ MY YOUTUBE CHANNEL REV J HD

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