Gas Tank Pressure - The 1947 - Present Chevrolet & GMC Truck Message Board Network

72futuresweet2wd · 10-08-2002, 07:33 PM

Does anyone else have this problem my Gas tank pressure builds up so much it forces fuel out of the key hole of the gas cap. It is doing terrible things to my paint. The original gas cap doesn't have a key hole but the fuel still dumps around the seal. Any help or advice would be appreciated.

Thanks

6869704X4 · 10-08-2002, 10:14 PM

How are the 72s vented? Did they have the canister?

**ThreeQuarter** · 10-08-2002, 10:23 PM

The '72s had a vent tube coming form the top RH corner, and the hose ran up the RH cab corner over a hook and back down the cab corner wall and through the cab floor. It ran up the frame and across the rad. support to the charcoal canister mounted on the LH backside side of the rad. support.

6869704X4 · 10-09-2002, 12:44 AM

Maybe the vents clogged?

72futuresweet2wd · 10-09-2002, 10:46 AM

This is on my 69 were they the same? I will check the vent tube and see if it is clogged this evening when I get home.

Thanks

**ThreeQuarter** · 10-09-2002, 11:06 AM

The EEC vent system I described is only on '72s. Which may be why you're having a problem with your '69.

hanssolo · 10-13-2002, 01:37 PM

Drill a small hole in the cap. 1/16". You won't destroy the planet.

10-08-2002, 07:33 PM	#1
72futuresweet2wd The face of my 69 c10 Join Date: Jan 2001 Location: Central Indiana Posts: 171	Gas Tank Pressure Does anyone else have this problem my Gas tank pressure builds up so much it forces fuel out of the key hole of the gas cap. It is doing terrible things to my paint. The original gas cap doesn't have a key hole but the fuel still dumps around the seal. Any help or advice would be appreciated. Thanks __________________ 2002 Harley Davidson VRod 1972 2wd Blazer (Project) 1969 Chevy C10 (Driver) 2002 Chevy Trailblazer (Wifes)

10-08-2002, 10:14 PM	#2
6869704X4 Registered User Join Date: Jul 2002 Location: SE NM Posts: 769	How are the 72s vented? Did they have the canister? __________________ The more I learn about women, the more I love my truck.

10-08-2002, 10:23 PM	#3
ThreeQuarter Senior Member Join Date: Jun 2000 Location: Texan in Iowa Posts: 2,522	The '72s had a vent tube coming form the top RH corner, and the hose ran up the RH cab corner over a hook and back down the cab corner wall and through the cab floor. It ran up the frame and across the rad. support to the charcoal canister mounted on the LH backside side of the rad. support. __________________ Ben '68 Chevy C10 Custom LWB 327/TH400 2nd owner '16 GMC Sierra 1500 SLE Dblcab 4wd 5.3

10-09-2002, 12:44 AM	#4
6869704X4 Registered User Join Date: Jul 2002 Location: SE NM Posts: 769	Maybe the vents clogged? __________________ The more I learn about women, the more I love my truck.

10-09-2002, 10:46 AM	#5
72futuresweet2wd The face of my 69 c10 Join Date: Jan 2001 Location: Central Indiana Posts: 171	This is on my 69 were they the same? I will check the vent tube and see if it is clogged this evening when I get home. Thanks __________________ 2002 Harley Davidson VRod 1972 2wd Blazer (Project) 1969 Chevy C10 (Driver) 2002 Chevy Trailblazer (Wifes)

10-09-2002, 11:06 AM	#6
ThreeQuarter Senior Member Join Date: Jun 2000 Location: Texan in Iowa Posts: 2,522	The EEC vent system I described is only on '72s. Which may be why you're having a problem with your '69. __________________ Ben '68 Chevy C10 Custom LWB 327/TH400 2nd owner '16 GMC Sierra 1500 SLE Dblcab 4wd 5.3

10-13-2002, 01:37 PM	#7
hanssolo Registered User Join Date: Sep 2001 Location: central Ill. USA Posts: 447	Drill a small hole in the cap. 1/16". You won't destroy the planet. __________________ 69 C10 longbed: 357c.i. /TH400/3.73s/AC/ beige primer/saving $ for paint ______________________________

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