fuel tank sending unit - The 1947 - Present Chevrolet & GMC Truck Message Board Network

68chevy10 · 01-27-2003, 02:30 PM

my friend has a 72 chev custom 10, we can't figure out why there is an extra line coming out of the sending unit in the fuel tank, it runs up the back of the cab into the roof somewhere, is this a vent or something? why does it go up into the roof? It apears to be factory

70c10 · 01-27-2003, 02:33 PM

I believe it is a vent they started using in 71'.

JimKshortstep4x4 · 01-27-2003, 03:07 PM

You will see the double vent on AC equipped trucks for the most
part. Does your friends truck have AC?

Jim

68chevy10 · 01-27-2003, 03:11 PM

no this truck does not have a/c, it is about the plainest truck you'll ever see. it is all original he bought it from the original owner, so it is the original fuel tank for the truck.

JimKshortstep4x4 · 01-27-2003, 08:06 PM

Does the smaller line go to the evaporative canister or to the fuel pump (with the larger line)?

Jim

zyggy72 · 01-27-2003, 08:23 PM

The vent line that goes up into the corner of the cab was part of the EEC (Evaporative Emissions Control) system. This vent line was produced starting in 1971 and continued into 1972 and was equipped on all 1/2 ton trucks and also on a few 3/4 ton trucks. The in-cab gas tanks in 1971 and 1972 on all 1/2 ton and some 3/4 ton trucks had the "new" style gas tank with the breather hose going from the top of the tank to the filler neck.

01-27-2003, 02:30 PM	#1
68chevy10 Registered User Join Date: Jan 2003 Location: medicine hat, AB Canada Posts: 11	fuel tank sending unit my friend has a 72 chev custom 10, we can't figure out why there is an extra line coming out of the sending unit in the fuel tank, it runs up the back of the cab into the roof somewhere, is this a vent or something? why does it go up into the roof? It apears to be factory

01-27-2003, 02:33 PM	#2
70c10 67-72 Addict! Join Date: Feb 2002 Location: The TAX State! Posts: 7,856	I believe it is a vent they started using in 71'. __________________ Jim 1970 C/10 Fleetside w/Ghost Flames Lowered 4.5" front and 4" rear (Raked) 355/350 Turbo w/shift kit 10" Redneck Performance Verter w/2500 stall Hooker Super Comps part#2808-1 Performer RPM Air-Gap 12 Bolt w/3:73 gears- Eaton Posi Comp Cams XE262 with 1.6 Crane Energizers, Road Demon 625 and Brodix IK 180 heads

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01-27-2003, 03:07 PM	#3
JimKshortstep4x4 Senior Member Join Date: Jul 2001 Location: Muskegon,MI,USA Posts: 6,026	You will see the double vent on AC equipped trucks for the most part. Does your friends truck have AC? Jim

01-27-2003, 03:11 PM	#4
68chevy10 Registered User Join Date: Jan 2003 Location: medicine hat, AB Canada Posts: 11	no this truck does not have a/c, it is about the plainest truck you'll ever see. it is all original he bought it from the original owner, so it is the original fuel tank for the truck.

01-27-2003, 08:06 PM	#5
JimKshortstep4x4 Senior Member Join Date: Jul 2001 Location: Muskegon,MI,USA Posts: 6,026	Does the smaller line go to the evaporative canister or to the fuel pump (with the larger line)? Jim

01-27-2003, 08:23 PM	#6
zyggy72 Can't kick the addiction! Join Date: Jan 2002 Location: Riverton, CT 06065 Posts: 402	The vent line that goes up into the corner of the cab was part of the EEC (Evaporative Emissions Control) system. This vent line was produced starting in 1971 and continued into 1972 and was equipped on all 1/2 ton trucks and also on a few 3/4 ton trucks. The in-cab gas tanks in 1971 and 1972 on all 1/2 ton and some 3/4 ton trucks had the "new" style gas tank with the breather hose going from the top of the tank to the filler neck.



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