Emissions on 4X4's ?? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**JQ-72** · 01-10-2006, 06:28 PM

Did 4wd drive trucks come with the emissions equipment that 2wd drives had? I have a 72 K20 and it does not have the charcoal canister or the second (smaller) fuel line on the frame. Was wondering if it ever had it or was removed by a previous owner. Thnaks
Joshua

**Stocker** · 01-10-2006, 09:01 PM

I would think there was no difference from a 2WD to a 4WD, but I'm not sure. More likely, it depends on where it was first sold (for instance, Calif. may be different), and the GVWR. My Calif. K20 has the charcoal canister, single fuel line, and no smog pump.

ben@speedbarn · 01-12-2006, 01:03 PM

Yeah emmision stuff was based on GVW ratings rather than 2wd or 4wd and California was always stricter than anywhere else. My 76 k25 doesn't have a cat, second fuel line, airpump, or charcoal canister an never did.

Barben · 01-22-2006, 02:32 AM

My California '71 K10 has/had an evap canister and AIR (air pump) system.

Chevrolet4x4s · 02-01-2006, 10:50 PM

1972 probally didn't have the emissions stuff.

01-10-2006, 06:28 PM	#1
JQ-72 Senior Member Join Date: Feb 2001 Location: Killen, Alabama USA Posts: 3,566	Emissions on 4X4's ?? Did 4wd drive trucks come with the emissions equipment that 2wd drives had? I have a 72 K20 and it does not have the charcoal canister or the second (smaller) fuel line on the frame. Was wondering if it ever had it or was removed by a previous owner. Thnaks Joshua

01-10-2006, 09:01 PM	#2
Stocker 20' Daredevil (Ret) Join Date: May 2003 Location: Jefferson State Posts: 13,571	Re: Emissions on 4X4's ?? I would think there was no difference from a 2WD to a 4WD, but I'm not sure. More likely, it depends on where it was first sold (for instance, Calif. may be different), and the GVWR. My Calif. K20 has the charcoal canister, single fuel line, and no smog pump. __________________ - Mike - 1972 K20 LWB 350/350/205 RIP El Jay

01-12-2006, 01:03 PM	#3
ben@speedbarn Done yet? Join Date: Jun 2005 Location: Pittsburgh Posts: 118	Re: Emissions on 4X4's ?? Yeah emmision stuff was based on GVW ratings rather than 2wd or 4wd and California was always stricter than anywhere else. My 76 k25 doesn't have a cat, second fuel line, airpump, or charcoal canister an never did. __________________ '76 k2500 -- almost done...

01-22-2006, 02:32 AM	#4
Barben Registered User Join Date: Aug 2005 Location: CenCal Posts: 36	Re: Emissions on 4X4's ?? My California '71 K10 has/had an evap canister and AIR (air pump) system. Last edited by Barben; 01-22-2006 at 02:33 AM.

02-01-2006, 10:50 PM	#5
Chevrolet4x4s Registered User Join Date: Nov 2005 Location: WV Posts: 227	Re: Emissions on 4X4's ?? 1972 probally didn't have the emissions stuff. __________________ 1993 K1500 350 5 speed 1985 K10 Silverado Vortec 406 5 speed (in body shop) "I been drivin' this '85 pickup truck Them buddies of mine call it a bucket of rust She's a little beat up but she still runs like the wind Yeah, kinda like me I been banged and bruisedBeen around the block a time or two But I'm runnin' like new goin' places I never been No, I ain't broke I'm just broken in" 1963 Dodge Townwagon(its amazng what 30 years and zero miles will do to a vehicle ) Member#20327



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