new guy with a question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

butler57 · 09-07-2010, 09:08 PM

I'm very new to the site and thought I should introduce myself. I picked up a '72 earlier this summer and found this site to be an excellent source of info. One of the first things I did on the truck was pull out the dash cluster and fix the gauges and lights as the only thing working was the speedo. I tracked down everything posted on how to tell if the gauge was working and ended up only needing to replace the float on the sending unit. Anyway, I really appreciate all of the knowledge that is shared here. Sure helps out.
here's a picture of the top of the gas tank. Any idea why the PO would block one line?

71meangreenc10 · 09-07-2010, 09:11 PM

Unless the vent lines that run up the cab are broken, I really dont understand why either.

Smitty

Shyguy · 09-07-2010, 09:44 PM

A lot of people remove the charcoal canister and block off that connection on the tank. Then install a vented gas cap.

I left the hose on my tank to act as a vent for the tank on my '71 since the gas cap on it is of the non-vented type.

Old Yeller 1970 · 09-08-2010, 12:02 AM

I don't know about your question but WELCOME to the forum.

butler57 · 09-08-2010, 09:45 PM

Hey shyguy, what do you mean by a charcoal filter? I disconnected the other line, unbolted the vent piece but it's just a looped fuel line. where is the filter?

Shyguy · 09-08-2010, 09:57 PM

The charcoal cansiter filter thing is inside the passenger fender at the very front by the battery.

I imagine there are people with these trucks that don't even know they are there.

I think they are '71 and newer trucks that have them and I have found not all of them have them.

Seraph · 09-08-2010, 11:35 PM

is it necessary to run a charcoal canister if your truck came with one or can u just bypass it.

Seraph · 09-09-2010, 12:00 AM

never mind the answer i was looking for was in a previous post......i must be really tired...

Andy4639 · 09-09-2010, 02:08 AM

The line that is plugged is the cab line that runs up into the top passenger side of the cab. I would think the only reason to do what he did was he was getting fumes out of it when the tank was full and getting hot. Most fumes are from the gas tank cap itself though not those lines.

09-07-2010, 09:08 PM	#1
butler57 Registered User Join Date: Jul 2010 Location: high river ab Posts: 127	new guy with a question I'm very new to the site and thought I should introduce myself. I picked up a '72 earlier this summer and found this site to be an excellent source of info. One of the first things I did on the truck was pull out the dash cluster and fix the gauges and lights as the only thing working was the speedo. I tracked down everything posted on how to tell if the gauge was working and ended up only needing to replace the float on the sending unit. Anyway, I really appreciate all of the knowledge that is shared here. Sure helps out. here's a picture of the top of the gas tank. Any idea why the PO would block one line? Attached Images

09-07-2010, 09:11 PM	#2
71meangreenc10 Its a Truck Thing...... Join Date: Dec 2004 Location: Sierra Vista, Arizona Posts: 3,179	Re: new guy with a question Unless the vent lines that run up the cab are broken, I really dont understand why either. Smitty __________________ 71 C10 283/3SPD Full Resto 71 GMC 1500 Sierra Grande http://67-72chevytrucks.com/vboard/s...d.php?t=518599 70 C10 Suburban Former military GSA truck. 72 Chevy Blazer 4X4, Sloppy Jo, Mountain Climber. Wife says no more trucks. http://67-72chevytrucks.com/vboard/s...d.php?t=707378 72 GMC 1 Ton Motor Home, wife said no more trucks until she saw this one. Gen 3 6.0/4L80E 4.10 http://67-72chevytrucks.com/vboard/s...d.php?t=761110 68 GMC Suburban was 3/4 ton, now 1/2.Wife shook her head 71 C30 Wrecker 71 C20 Scott-Bilt As weird as it gets..BB Cheyenne AC Truck 68 GMC Long Stepside. They keep following me home 69 C30 Former Motor Home, Flat Bed time 70 G20 Red-E-Kamp Conversion "I'm your Boogy Van"

09-07-2010, 09:44 PM	#3
Shyguy Junior Member Join Date: Dec 2006 Location: Southeast Missouri Posts: 2,436	Re: new guy with a question A lot of people remove the charcoal canister and block off that connection on the tank. Then install a vented gas cap. I left the hose on my tank to act as a vent for the tank on my '71 since the gas cap on it is of the non-vented type. __________________ '67 Chevy C-20 short stepper - build complete, 454/SM-465. '75 C-30 Single Cab DRW-350 small block/NP-435. '77 GMC-6500 Dump Truck, 427 Tall Deck. '92 GMC K-3500 Duallie, 454/4L80E.

09-08-2010, 12:02 AM	#4
Old Yeller 1970 DON'T TREAD ON ME Join Date: May 2005 Location: Crosby County, TX Posts: 989	Re: new guy with a question I don't know about your question but WELCOME to the forum. __________________ Old Yeller

09-08-2010, 09:45 PM	#5
butler57 Registered User Join Date: Jul 2010 Location: high river ab Posts: 127	Re: new guy with a question Hey shyguy, what do you mean by a charcoal filter? I disconnected the other line, unbolted the vent piece but it's just a looped fuel line. where is the filter?

09-08-2010, 09:57 PM	#6
Shyguy Junior Member Join Date: Dec 2006 Location: Southeast Missouri Posts: 2,436	Re: new guy with a question The charcoal cansiter filter thing is inside the passenger fender at the very front by the battery. I imagine there are people with these trucks that don't even know they are there. I think they are '71 and newer trucks that have them and I have found not all of them have them. __________________ '67 Chevy C-20 short stepper - build complete, 454/SM-465. '75 C-30 Single Cab DRW-350 small block/NP-435. '77 GMC-6500 Dump Truck, 427 Tall Deck. '92 GMC K-3500 Duallie, 454/4L80E.

09-08-2010, 11:35 PM	#7
Seraph Registered User Join Date: Oct 2009 Location: Streetman Texas Posts: 134	Re: new guy with a question is it necessary to run a charcoal canister if your truck came with one or can u just bypass it. __________________ 1972 chevy c 10 longbed 2000 Ford Powerstroke (daily driver) Last edited by Seraph; 09-08-2010 at 11:36 PM.

09-09-2010, 12:00 AM	#8
Seraph Registered User Join Date: Oct 2009 Location: Streetman Texas Posts: 134	Re: new guy with a question never mind the answer i was looking for was in a previous post......i must be really tired... __________________ 1972 chevy c 10 longbed 2000 Ford Powerstroke (daily driver)

09-09-2010, 02:08 AM	#9
Andy4639 Old member Join Date: Jan 2002 Location: Liberty, & Garden City S.C. , U.S. Posts: 19,945	Re: new guy with a question The line that is plugged is the cab line that runs up into the top passenger side of the cab. I would think the only reason to do what he did was he was getting fumes out of it when the tank was full and getting hot. Most fumes are from the gas tank cap itself though not those lines. __________________ 1971 LWB Custom, 6.0LS & 4L80E, Speedhut.com GPS speedometer & gauges with A/C. 20" Boss 338's Grey wheels 4 wheel disc brakes. My Driver Seeing the USA in a 71 Upstate SC GM Truck Club 2013,14 and 2016 Hot Rod Pour Tour http://upstategmtrucks.com/ Get out and drive the truck this summer and have some fun! It sucks not being able to hear! LWB trucks rule, if you don't think so measure your SWB! After talking to tech support at Air Lift I have found out that the kit I need is 60811. Per the measurements I gave them. Ride height of truck inside spring and inside diameter of springs.

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