Recent Topics
PL10241 Cut Open
by Vegoose
02/11/16 11:15 PM
Seems like common sense to me......
by Doog
02/11/16 11:14 PM
Thinking of buying an old diesel Benz
by Diego3336
02/11/16 10:46 PM
Mobil 1 5W30 5279 Miles 06 Toyota Tacoma V6 401k
by qnyla
02/11/16 09:43 PM
2007 corolla oil pan steel or aluminum?
by Rolla07
02/11/16 09:07 PM
Taiwan DMV "Mechanical Knowledgee" Test Question
by Ducked
02/11/16 08:56 PM
Paint correction
by mjoekingz28
02/11/16 08:55 PM
Filtertran Filter From My Vehicle 96K Miles
by oil_abuser
02/11/16 08:53 PM
Bleeding brakes cleanly
by mjoekingz28
02/11/16 08:51 PM
Any thoughts on the Super Bumper? (Hitch Bumper)
by Fsharp
02/11/16 08:37 PM
Ransomware.....
by BrianF
02/11/16 08:22 PM
Electic motor lube oil
by Ztill
02/11/16 07:39 PM
Newest Members
engus, Rob_Pol, Nick24w, SkipKaye, MikeHancho
56899 Registered Users
Who's Online
69 registered (bbhero, BTLew81, bdcardinal, 01rangerxl, akela, Bandito440, 3 invisible), 885 Guests and 213 Spiders online.
Key: Admin, Global Mod, Mod
Forum Stats
56899 Members
66 Forums
244576 Topics
3983421 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