gas tank plumbing question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

awitate · 12-06-2015, 06:42 PM

There are 3 pipes coming out of this side of the tank. The big one on the right is obviously the filler neck. I'm guessing the small one on the left is a gas send which I won't be using becuase I'm using the gas send on the opposite side of the tank. Since I won't be using this one I plan to plug it up. Which leaves the bent pipe in the middle. What is that one for? Is it suppose to link in to the filler neck?

**The Rocknrod** · 12-06-2015, 06:49 PM

What tank did you buy? Where did you buy it?

awitate · 12-06-2015, 06:53 PM

I got it from American classic. It's the same one that LMC and most other place sell. I think its the Blazer tank.

**The Rocknrod** · 12-06-2015, 06:59 PM

It may be a return line from the engine. The middle size one is probably from the filler neck vent.
Keep us posted on the install with pics, I have a bed fill aluminum unit right now and am strongly thinking of using the same tank you are.

So I want to see it installed and get the story.
(something like this)

**Captainfab** · 12-07-2015, 12:52 AM

The small tube next to the filler is the vent that connects to the filler and the other is likely to go to the evap canister. Pretty much as Rocknrod posted.

**Chevy Fleetside** · 12-07-2015, 10:33 AM

I plugged the one in the middle and used the smaller one as a return.

jtrichard · 12-07-2015, 12:40 PM

With the vent/middle plugged be prepared to get sprayed with gas EVERY time you fill the tank

awitate · 12-07-2015, 01:52 PM

2 more questions. Since these truck don't have a vapor canistor.
1. Which one should I use? Blazer's vapor canister?

2. If I use a vapor Canistor does that mean I don't need a vented gas cap?

Not sure this makes a difference but I'm running a carburetor not fuel injection.

**Captainfab** · 12-08-2015, 12:38 AM

You do not have to use a vapor canister, that is just what that nipple is for. Just cap/plug that nipple.

12-06-2015, 06:42 PM	#1
awitate Registered User Join Date: Dec 2011 Location: austin,tx Posts: 47	gas tank plumbing question There are 3 pipes coming out of this side of the tank. The big one on the right is obviously the filler neck. I'm guessing the small one on the left is a gas send which I won't be using becuase I'm using the gas send on the opposite side of the tank. Since I won't be using this one I plan to plug it up. Which leaves the bent pipe in the middle. What is that one for? Is it suppose to link in to the filler neck? Attached Images

12-06-2015, 06:49 PM	#2
The Rocknrod Moderator Join Date: Aug 2011 Location: China Spring, TX Posts: 7,280	Re: gas tank plumbing question What tank did you buy? Where did you buy it? __________________ Master Chief, US Navy, Retired 1964 C10 Step-side Short Bed - In Progress 2009 2500HD Duramax LTZ 1948 GMC Panel 1956 Big Window Stepside 1953 5 Window Chevy Stepside 1932 Coupe New Seat Foam for Bench Seats?

12-06-2015, 06:53 PM	#3
awitate Registered User Join Date: Dec 2011 Location: austin,tx Posts: 47	Re: gas tank plumbing question I got it from American classic. It's the same one that LMC and most other place sell. I think its the Blazer tank.

12-06-2015, 06:59 PM	#4
The Rocknrod Moderator Join Date: Aug 2011 Location: China Spring, TX Posts: 7,280	Re: gas tank plumbing question It may be a return line from the engine. The middle size one is probably from the filler neck vent. Keep us posted on the install with pics, I have a bed fill aluminum unit right now and am strongly thinking of using the same tank you are. So I want to see it installed and get the story. (something like this) __________________ Master Chief, US Navy, Retired 1964 C10 Step-side Short Bed - In Progress 2009 2500HD Duramax LTZ 1948 GMC Panel 1956 Big Window Stepside 1953 5 Window Chevy Stepside 1932 Coupe New Seat Foam for Bench Seats?

12-07-2015, 12:52 AM	#5
Captainfab 60-66 Nut Join Date: Mar 2007 Location: Coeur d'Alene, Idaho Posts: 23,252	Re: gas tank plumbing question The small tube next to the filler is the vent that connects to the filler and the other is likely to go to the evap canister. Pretty much as Rocknrod posted. __________________ Power Steering Box Adapter Plates For Sale HERE Power Brake Booster Adapter Brackets For Sale '63-'66 HERE and '67-'72 HERE and '60-'62 HERE and "60-'62 with clutch HERE Rear Disc Brake Brackets For Sale. Impala SS calipers HERE Camaro Calipers HERE D52 Calipers HERE 6 Lug HERE Hydroboost Mounting Plates HERE

12-07-2015, 10:33 AM	#6
Chevy Fleetside Registered User Join Date: Sep 2006 Location: San Francisco Posts: 4,782	Re: gas tank plumbing question I plugged the one in the middle and used the smaller one as a return. __________________ "A man and his truck, what a beautiful thing" 65 Short Fleetside BBC 65 Long Fleetside 283 3 on the tree for now. my build thread http://www.67-72chevytrucks.com/vboa...d.php?t=259536

12-07-2015, 12:40 PM	#7
jtrichard Registered User Join Date: Jun 2013 Location: joshua tree ca. Posts: 1,484	Re: gas tank plumbing question With the vent/middle plugged be prepared to get sprayed with gas EVERY time you fill the tank

12-07-2015, 01:52 PM	#8
awitate Registered User Join Date: Dec 2011 Location: austin,tx Posts: 47	Re: gas tank plumbing question 2 more questions. Since these truck don't have a vapor canistor. 1. Which one should I use? Blazer's vapor canister? 2. If I use a vapor Canistor does that mean I don't need a vented gas cap? Not sure this makes a difference but I'm running a carburetor not fuel injection. Last edited by awitate; 12-07-2015 at 02:11 PM.

12-08-2015, 12:38 AM	#9
Captainfab 60-66 Nut Join Date: Mar 2007 Location: Coeur d'Alene, Idaho Posts: 23,252	Re: gas tank plumbing question You do not have to use a vapor canister, that is just what that nipple is for. Just cap/plug that nipple. __________________ Power Steering Box Adapter Plates For Sale HERE Power Brake Booster Adapter Brackets For Sale '63-'66 HERE and '67-'72 HERE and '60-'62 HERE and "60-'62 with clutch HERE Rear Disc Brake Brackets For Sale. Impala SS calipers HERE Camaro Calipers HERE D52 Calipers HERE 6 Lug HERE Hydroboost Mounting Plates HERE



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