Gas tank fitment? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

CCCC · 05-07-2020, 03:42 PM

After having stored it for quite a long time, went to install a very good condition behind-the-seat fuel tank only to find that it has what looks like some sort of a return line at the tank opening - just adjacent to the output line, and there is another line coming out at the top of the tank on pass side - maybe a vent?. Shape/size of tank looks like it will fit but am thinking that this is not standard for a 67-72 Chev/GMC. Anybody know about this?

I can defeat the extra tubes as needed - but will this one bolt into a 67-72? Thanks for any expertise/knowledge shared.

**bigmac73** · 05-07-2020, 07:50 PM

Are u sure that is not a 72 with ecc?
Pics would be great. My 72 tank has two vent on the end for a expansion loop tube that goes up the side of the cab. And a drain back on the filler neck . A suction and return on the float assembly

CCCC · 05-07-2020, 08:33 PM

Quote:

Originally Posted by bigmac73

Are u sure that is not a 72 with ecc?
Pics would be great. My 72 tank has two vent on the end for a expansion loop tube that goes up the side of the cab. And a drain back on the filler neck . A suction and return on the float assembly

No, am not sure - simply have not seen one with these extra lines. My 72 Longhorn does not have such plumbing and the other72s (Blazer, MoHome, etc. ) do not have tanks behind the seat. Maybe you nailed it - what is "ecc" - is that the arrangement with the charcoal canister in the front right fender well? Do you happen to know if 73+ model behind seat tanks are same size/shape and have mounting hole config?

Thanks.

**bigmac73** · 05-07-2020, 09:25 PM

73 and up had tanks under the bed i will take a p I c of my tank

**bigmac73** · 05-07-2020, 09:39 PM

I think it is eec not ecc evaporate emissions control.for some reason the web site will not let me upload the pics, something about missing token and administrator

**Richard** · 05-07-2020, 09:47 PM

The 3/4 ton and up typically did not have the emissions. Only the 1/2 ton.

**bigmac73** · 05-07-2020, 09:47 PM

finally got it

vitamin_c95 · 05-07-2020, 11:09 PM

I was going to install one but I ran into problems trying to clean the tank out and gave up. I made a similar post. Tank should still work, you jist gotta cap off the vent and a certain fuel cap. Can't remember if it was vented cap or not. Someone will chime in

CCCC · 05-08-2020, 01:29 AM

Thanks for the photos and placement info from bigmac73 and the cap info from vitamin c95. Questions answered and doubts removed. This is the tank I have - will plug the two not needed lines and use a vented cap. Much appreciated.

**bigmac73** · 05-08-2020, 07:34 AM

actually I recommend using the vent on the end of the tank ,just run a long loop up the cab corner and then back down out the bottom of the cab. plus a vented cap

05-07-2020, 03:42 PM	#1
CCCC Registered User Join Date: Mar 2007 Location: San Pedro River, SE Arizona Posts: 735	Gas tank fitment? After having stored it for quite a long time, went to install a very good condition behind-the-seat fuel tank only to find that it has what looks like some sort of a return line at the tank opening - just adjacent to the output line, and there is another line coming out at the top of the tank on pass side - maybe a vent?. Shape/size of tank looks like it will fit but am thinking that this is not standard for a 67-72 Chev/GMC. Anybody know about this? I can defeat the extra tubes as needed - but will this one bolt into a 67-72? Thanks for any expertise/knowledge shared. __________________ CCCC 67 Sting Ray Coupe 327 4sp; 68 K10 Suburban 327 4sp; 69 K20 Lifted 383 4sp; 69 C80 Fire Truck 478 V6 5sp/2sp; 69 C20 Longhorn 327 4sp; 70 C30 Wrecker 350 4sp; 70 C30 Flat Bed 350 4sp; 71 C20 LWB 350 4sp; 72 K5 Blazer 350 4sp; 72 C30 Flat Bed Gooseneck Hauler with sleeper 350/TH400; 72 C20 Longhorn 402 4sp; 52 Mack LTL Supercharged Cummins 5sp x 3sp; 01 Dodge 5.9 HO Cummins 6spd; 02 Safari Trek 2430 8.1 Vortec on Workhorse Chassis; 03 Silverado 2500 HD 4wd Duramax/Allison Moved but still in the family 70 C20 Custom Camper 350/TH350; 72 K5 Blazer CST Highlander 350/TH350 Recently sent to new homes 72 C30 MoHome 402 4sp; 72 K5 Blazer Conv 350 4sp; 75 GMC 6000 Aerial 350 w Allison; 72 GMC 3500 Utility 350 4sp; 70 GMC 3500, 350 4sp

05-07-2020, 07:50 PM	#2
bigmac73 Senior Member Join Date: Mar 2012 Location: Chesapeake, Va Posts: 1,275	Re: Gas tank fitment? Are u sure that is not a 72 with ecc? Pics would be great. My 72 tank has two vent on the end for a expansion loop tube that goes up the side of the cab. And a drain back on the filler neck . A suction and return on the float assembly __________________ Mike 72 C-10 Cheyenne off frame resto and Upgraded to 4 wheel disk, Tilt, Dakota Digital Dash / Rear slider. 421 SBC / TH350 3000RPM Stall Progression Ignition /Holley 750 DP/3:73 gear Eaton Limited Slip unit / 2 1/2 exhaust glasspacks

05-07-2020, 09:25 PM	#4
bigmac73 Senior Member Join Date: Mar 2012 Location: Chesapeake, Va Posts: 1,275	Re: Gas tank fitment? 73 and up had tanks under the bed i will take a p I c of my tank __________________ Mike 72 C-10 Cheyenne off frame resto and Upgraded to 4 wheel disk, Tilt, Dakota Digital Dash / Rear slider. 421 SBC / TH350 3000RPM Stall Progression Ignition /Holley 750 DP/3:73 gear Eaton Limited Slip unit / 2 1/2 exhaust glasspacks

05-07-2020, 09:39 PM	#5
bigmac73 Senior Member Join Date: Mar 2012 Location: Chesapeake, Va Posts: 1,275	Re: Gas tank fitment? I think it is eec not ecc evaporate emissions control.for some reason the web site will not let me upload the pics, something about missing token and administrator __________________ Mike 72 C-10 Cheyenne off frame resto and Upgraded to 4 wheel disk, Tilt, Dakota Digital Dash / Rear slider. 421 SBC / TH350 3000RPM Stall Progression Ignition /Holley 750 DP/3:73 gear Eaton Limited Slip unit / 2 1/2 exhaust glasspacks

05-07-2020, 09:47 PM	#6
Richard Senior Member Join Date: Dec 1999 Location: Southern California Posts: 2,906	Re: Gas tank fitment? The 3/4 ton and up typically did not have the emissions. Only the 1/2 ton. __________________ Richard 1972 K10 Custom Deluxe SWB Fleetside My build https://67-72chevytrucks.com/vboard/...d.php?t=800746

05-07-2020, 09:47 PM	#7
bigmac73 Senior Member Join Date: Mar 2012 Location: Chesapeake, Va Posts: 1,275	Re: Gas tank fitment? finally got it Attached Images __________________ Mike 72 C-10 Cheyenne off frame resto and Upgraded to 4 wheel disk, Tilt, Dakota Digital Dash / Rear slider. 421 SBC / TH350 3000RPM Stall Progression Ignition /Holley 750 DP/3:73 gear Eaton Limited Slip unit / 2 1/2 exhaust glasspacks

05-07-2020, 11:09 PM	#8
vitamin_c95 Registered User Join Date: Feb 2019 Location: So Cal, CA Posts: 108	Re: Gas tank fitment? I was going to install one but I ran into problems trying to clean the tank out and gave up. I made a similar post. Tank should still work, you jist gotta cap off the vent and a certain fuel cap. Can't remember if it was vented cap or not. Someone will chime in __________________ 1971 C20 Longhorn 350/350 "Conquistador" Last edited by vitamin_c95; 05-07-2020 at 11:14 PM.

05-08-2020, 01:29 AM	#9
CCCC Registered User Join Date: Mar 2007 Location: San Pedro River, SE Arizona Posts: 735	Re: Gas tank fitment? Thanks for the photos and placement info from bigmac73 and the cap info from vitamin c95. Questions answered and doubts removed. This is the tank I have - will plug the two not needed lines and use a vented cap. Much appreciated. __________________ CCCC 67 Sting Ray Coupe 327 4sp; 68 K10 Suburban 327 4sp; 69 K20 Lifted 383 4sp; 69 C80 Fire Truck 478 V6 5sp/2sp; 69 C20 Longhorn 327 4sp; 70 C30 Wrecker 350 4sp; 70 C30 Flat Bed 350 4sp; 71 C20 LWB 350 4sp; 72 K5 Blazer 350 4sp; 72 C30 Flat Bed Gooseneck Hauler with sleeper 350/TH400; 72 C20 Longhorn 402 4sp; 52 Mack LTL Supercharged Cummins 5sp x 3sp; 01 Dodge 5.9 HO Cummins 6spd; 02 Safari Trek 2430 8.1 Vortec on Workhorse Chassis; 03 Silverado 2500 HD 4wd Duramax/Allison Moved but still in the family 70 C20 Custom Camper 350/TH350; 72 K5 Blazer CST Highlander 350/TH350 Recently sent to new homes 72 C30 MoHome 402 4sp; 72 K5 Blazer Conv 350 4sp; 75 GMC 6000 Aerial 350 w Allison; 72 GMC 3500 Utility 350 4sp; 70 GMC 3500, 350 4sp

05-08-2020, 07:34 AM	#10
bigmac73 Senior Member Join Date: Mar 2012 Location: Chesapeake, Va Posts: 1,275	Re: Gas tank fitment? actually I recommend using the vent on the end of the tank ,just run a long loop up the cab corner and then back down out the bottom of the cab. plus a vented cap __________________ Mike 72 C-10 Cheyenne off frame resto and Upgraded to 4 wheel disk, Tilt, Dakota Digital Dash / Rear slider. 421 SBC / TH350 3000RPM Stall Progression Ignition /Holley 750 DP/3:73 gear Eaton Limited Slip unit / 2 1/2 exhaust glasspacks



Register or Log In To remove these advertisements.

Register or Log In To remove these advertisements.