Recent Topics
Left over oil ?3
by Ndx
03/02/15 01:52 PM
Car out of storage?
by Camprunner
03/02/15 01:10 PM
can i use a 3614 inplace of a 4967 application?
by ziggy
03/02/15 12:11 PM
What is with x5 wheels?
by horse123
03/02/15 12:04 PM
$30 Wagner Thermo Quiet Rebate
by Va Runner
03/02/15 11:39 AM
Gun in nightstand
by Al
03/02/15 11:08 AM
Brake kit - Meyle / Akebono -vs- Powerstop?
by Ed_Flecko
03/02/15 10:39 AM
College Dropouts Build $14 Million Company in 1YR
by CourierDriver
03/02/15 09:58 AM
Titanium in motor oils
by Stelth
03/02/15 09:11 AM
Mobil Delvac REBATE. Delvac 1 ESP or LE and 1300
by Scott_mi
03/02/15 08:38 AM
Xterra, bypassed radiator. Any issues?
by Richtrashman
03/02/15 08:08 AM
91 Civic 3dr Hatchback Si clutch pedal
by Gito
03/02/15 08:03 AM
Newest Members
gidlestick, Koko4, Bianchi, Paul_B, Dexter55
53006 Registered Users
Who's Online
118 registered (29662, 01rangerxl, Andrei, 1foxracing, 2009Edge, 11 invisible), 1849 Guests and 231 Spiders online.
Key: Admin, Global Mod, Mod
Forum Stats
53006 Members
66 Forums
227424 Topics
3627736 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: 233
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: 1617
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: 1617
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