Installing blazer fuel tank

[manuelv72]

Hello all, this question is for those that know or have done the k5 tank conversion on their c10., I have a 72 with a carburated sb 350 & mechanical pump. Currently there are no original fuel lines so i have to run new from front to back. how did you plumb it? Did you keep the charcoal canister? How did you vent it? What size fuel lines? Sorry for all the questions but I live in the city where emissions are required and want to get it right. Thank you

[Peanut74]

I used 5/16" aluminum line for both supply and return lines. I ran my lines down the passenger frame rail and made my own fuel line clips. My truck is old school so there is no emissions on it so I can't answer your question on the charcoal canister.

I ran the return line as I want to go to EFT at some point down the road.

[manuelv72]

Originally Posted by Peanut74

I used 5/16" aluminum line for both supply and return lines. I ran my lines down the passenger frame rail and made my own fuel line clips. My truck is old school so there is no emissions on it so I can't answer your question on the charcoal canister.

I ran the return line as I want to go to EFT at some point down the road.

Thanks for info. I was planning on going 3/8 feed but not sure of return line.

[gmc684x4]

Fuel feed line should be 3/8 for a v8
5/16 is a light fuel line size

[driller35]

GMC684x4 is correct , 3/8 line for supply and return , i am in the process of doing a side fill blazer tank and going to try and modifying a holley 12-308 in tank pump and regulator to use stock filler sender unit,therefore eliminating return line, have set up sniper efi on 350 with in line fuel pump mounted to passenger frame and find it to noisy , have it plumbed with 3/8 line feed and return and no issues

[68Gold/white]

Originally Posted by driller35

GMC684x4 is correct , 3/8 line for supply and return , i am in the process of doing a side fill blazer tank and going to try and modifying a holley 12-308 in tank pump and regulator to use stock filler sender unit,therefore eliminating return line, have set up sniper efi on 350 with in line fuel pump mounted to passenger frame and find it to noisy , have it plumbed with 3/8 line feed and return and no issues

I would like to see how you get your stuff done. Do a thread on your install, if you have not, already. Thanks!

[68Gold/white]

Originally Posted by driller35

GMC684x4 is correct , 3/8 line for supply and return , i am in the process of doing a side fill blazer tank and going to try and modifying a holley 12-308 in tank pump and regulator to use stock filler sender unit,therefore eliminating return line, have set up sniper efi on 350 with in line fuel pump mounted to passenger frame and find it to noisy , have it plumbed with 3/8 line feed and return and no issues

I would like to see how you get your stuff done. Do a thread on your install, if you have not, already. Thanks!

[manuelv72]

Originally Posted by gmc684x4

Fuel feed line should be 3/8 for a v8
5/16 is a light fuel line size

Hey thanks for reply. I was planning on going 3/8" for feed just unsure on return line size. Also do you know if i vent tank
to the charcoal canister?

[driller35]

What is the current setup , you have a line from stock tank going to canister? The blazer tank i am using is a stock configuration tank and it has three nipples for vent , one 3/8 i am going to use for fuel filler vent, the other 2 i will use as just venting, my 70 never had the emissions crap on it

[manuelv72]

Originally Posted by driller35

What is the current setup , you have a line from stock tank going to canister? The blazer tank i am using is a stock configuration tank and it has three nipples for vent , one 3/8 i am going to use for fuel filler vent, the other 2 i will use as just venting, my 70 never had the emissions crap on it

My current set up is tank removed from cab, blazer tank under bed that is fed straight up thru bed floor. . All fuel lines in the truck were removed when tank was removed from inside cab . Im trying to run all new lines from new tank. I was just unsure what sizes i needed and if i need a return line as truck has a mechanical fuel pump. Also, does tank vent just to the charcoal canister or any other vents?

[TheKorndog]

Originally Posted by manuelv72

My current set up is tank removed from cab, blazer tank under bed that is fed straight up thru bed floor. . All fuel lines in the truck were removed when tank was removed from inside cab . Im trying to run all new lines from new tank. I was just unsure what sizes i needed and if i need a return line as truck has a mechanical fuel pump. Also, does tank vent just to the charcoal canister or any other vents?

I know there’s stuff out there for the blazer, this is what I’m running into on my resto. Converter to efi, put an in tank pump on it and trying to figure out if the charcoal canister and all of that will be helpful.

Have you made any progress on this?
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[68Gold/white]

Originally Posted by manuelv72

Hey thanks for reply. I was planning on going 3/8" for feed just unsure on return line size. Also do you know if i vent tank
to the charcoal canister?

It’s always best to use a return line at least as big as the supply. The smaller return line CAN restrict the return flow to the tank, causing more pressure to the engine. It’s not likely with your stockish setup, but something to consider.

[driller35]

will try and take pics 68Gold/White as i go and share

[fun in dirt]

We ran 3/8 Ni-cop from pump, down frame & back to fuel filter. It's so easy to bend and work with. https://www.jegs.com/i/JEGS/555/635806K/10002/-1
Then rubber fuel hose, added protective sleeve over it, from filter looped around into tank. (That way if ever have to remove tank can drop it easily.)
The vent is just rubber hose with a breather stuck on end; that was routed up into/between bedside inner & outer skin.

Pic on post #18 here http://67-72chevytrucks.com/vboard/s...32#post8653432

[Larry S]

Check out Hot Rod Fuel Hose online.
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