Recent Topics
Hate those adds that start with, "Lean 1 weird ...
by OneEyeJack
Today at 05:11 AM
How Much Olive Oil Do You Use?
by GrtArtiste
Today at 03:20 AM
Hyundai filter 26300-35503 10PK for 35.40 FREE S&H
by GumbyJarvis
Today at 01:10 AM
Dope smoking genius Laremy Tunsil NFL Draft Pick!
by GiveMeAVowel
Yesterday at 09:50 PM
'13 Honda VFR1200 Motul 10w-50, 5,300 miles.
by montero1
Yesterday at 09:35 PM
Anyone Using Spline Sockets?
by JHZR2
Yesterday at 09:33 PM
Anyone Tryed Spectra Premium O2 Sensors?
by Mr_Accord
Yesterday at 09:16 PM
UPS package tracking is so confusing!
by Klutch9
Yesterday at 07:52 PM
Dupont non-stick lube
by buck91
Yesterday at 07:47 PM
House electrical wiring question
by road_rascal
Yesterday at 07:46 PM
Air pressure question
by aquariuscsm
Yesterday at 07:43 PM
Fllow the DOT's
by WyrTwister
Yesterday at 07:23 PM
Newest Members
hdwizard21, raihan, aceracres, kg4geq, red_bulldog
57748 Registered Users
Who's Online
36 registered (06AllAmerican, 2002 Maxima SE, Al, Abakev, AEHaas, 1foxracing, 3 invisible), 722 Guests and 298 Spiders online.
Key: Admin, Global Mod, Mod
Forum Stats
57748 Members
66 Forums
248234 Topics
4059037 Posts

Max Online: 2862 @ 07/07/14 03:10 PM
Donate to BITOG
Page 2 of 2 < 1 2
Topic Options
#3311682 - 03/14/14 11:17 AM Re: Gas coming out of tank while filling [Re: Tom NJ]
hsd Offline


Registered: 09/05/09
Posts: 247
Loc: NE
The charcoal canister can not cause overflow during filling as it only functions when the system is sealed up (gas cap is installed).

Top
#3311978 - 03/14/14 04:14 PM Re: Gas coming out of tank while filling [Re: Tom NJ]
1 FMF Offline


Registered: 08/12/02
Posts: 1680
Loc: CT
when i had the back of my 2006 gmc sierra apart, i found that there's a valve in the filler neck of the fuel tank that's spring loaded and stays shut unless a force acts from outside to push it inward, such as fuel when filling. the purpose of it is to prevent fuel from coming out in case of a rollover. i believe all gas tanks have this, and also makes it nearly impossible to siphon gas out of the tank because it will block any hose from making it through. my guess is that valve is sticking or not opening all the way preventing any significant volume of fuel from entering the tank quickly. otherwise everything else is sealed, the evap canister and purge valves are always closed unless commanded open by the pcm. your vent for when filling the tank is a separate small hose that runs alongside the big fill hose and goes to the filler neck thing up on the body where your gas cap is. if you look where you insert the gas pump into that fill neck, there will be a separate small hole there, that's the vent which works when filling the tank because the gas cap is off. but when the gas cap is on then the fuel system is completely sealed.


Edited by 1 FMF (03/14/14 04:16 PM)

Top
#3311989 - 03/14/14 04:22 PM Re: Gas coming out of tank while filling [Re: Tom NJ]
1 FMF Offline


Registered: 08/12/02
Posts: 1680
Loc: CT
also gas with ethanol is quite a solvent, also attracts water, and over time can dry out that plastic valve and make it stick or corrode/rust the metal spring. using some kind of oil, like marvel mystery oil, which you can run with little problem in the fuel, shoot that down the fill neck every now and then to coat that anti-siphon valve and it may get better. otherwise if it's integrated into the plastic tank then you're looking at a new fuel tank.
but don't dump a pint of mmo down the fill neck just before filling up with gas and wash all the mmo down, that'll defeat the purpose.

Top
Page 2 of 2 < 1 2