What is this? 72 Jimmy - The 1947 - Present Chevrolet & GMC Truck Message Board Network

mgkgmc · 11-19-2012, 11:51 AM

Is this some kind of tank vent in the back of my Jimmy? The tube is capped off just before the bed rail and seems like several tubes from the gas tank go up inside it.

boonedogs72 · 11-19-2012, 12:11 PM

vent for the fuel tank

Dale99 · 11-19-2012, 02:12 PM

Its part of the evap system. The tank has a left and right vent hole. They run over to this, merge, then has 1 tube going to the charcoal canister, then to the motor.

boonedogs72 · 11-19-2012, 02:43 PM

Could a guy ditch the whole system?
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71swb4x4 · 11-19-2012, 02:56 PM

I am not an expert, but IMO you could ditch it, provided you have a vented fuel cap.

1949gmc · 11-19-2012, 03:00 PM

I remember reading that guys had issues with splash-back while filling the tank when the vent system was 'disabled'. May want to check into that.
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**Tom Vogel** · 11-20-2012, 10:32 AM

I eliminated all that. My tank is well vented though.

11-19-2012, 11:51 AM	#1
mgkgmc Registered User Join Date: Dec 2007 Location: Glendale Arizona Posts: 1,354	What is this? 72 Jimmy Is this some kind of tank vent in the back of my Jimmy? The tube is capped off just before the bed rail and seems like several tubes from the gas tank go up inside it. Attached Images __________________ 1970 GMC 1500 stepside 1972 GMC Jimmy Custom 2004 Chevy Colorado 1989 Swb Silverado 1972 Aj's Stormer Last edited by mgkgmc; 11-19-2012 at 12:05 PM.

11-19-2012, 12:11 PM	#2
boonedogs72 Registered User Join Date: Apr 2005 Location: redding ca Posts: 1,438	Re: What is this? 72 Jimmy vent for the fuel tank

11-19-2012, 02:12 PM	#3
Dale99 Registered User Join Date: Nov 2007 Location: NLR, AR Posts: 1,387	Re: What is this? 72 Jimmy Its part of the evap system. The tank has a left and right vent hole. They run over to this, merge, then has 1 tube going to the charcoal canister, then to the motor.

11-19-2012, 02:43 PM	#4
boonedogs72 Registered User Join Date: Apr 2005 Location: redding ca Posts: 1,438	Re: What is this? 72 Jimmy Could a guy ditch the whole system? Posted via Mobile Device

11-19-2012, 02:56 PM	#5
71swb4x4 Senior Member Join Date: Nov 2003 Location: Brookings, SD Posts: 10,497	Re: What is this? 72 Jimmy I am not an expert, but IMO you could ditch it, provided you have a vented fuel cap. __________________ Some people are like slinkies, they aren't good for anything, but you can't help but smile when you see one tumble down the stairs.

11-19-2012, 03:00 PM	#6
1949gmc Registered User Join Date: Nov 2004 Location: Lindenhurst, IL Posts: 659	Re: What is this? 72 Jimmy I remember reading that guys had issues with splash-back while filling the tank when the vent system was 'disabled'. May want to check into that. Posted via Mobile Device

11-20-2012, 10:32 AM	#7
Tom Vogel 2WD Jimmy Join Date: Mar 2005 Location: Davis County, Utah Posts: 2,565	Re: What is this? 72 Jimmy I eliminated all that. My tank is well vented though.



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