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Old 04-23-2004, 07:22 PM   #1
1968GMC
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fuel line question

What size is a coper fuel from gas tank to carb? Im using a blaser gas tank and its feeding a thersty 350 V8. Thanks in advance.
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Old 04-23-2004, 07:31 PM   #2
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I think it's 5/16.
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Old 04-23-2004, 07:52 PM   #3
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actually i believe 6cyl trucks had 5/16 and V8equipped trucks came with 3/8
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Old 04-23-2004, 08:43 PM   #4
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2bbl small blocks got 5/16, all inlines. 5/16, all V-6 3/8, all 4 bbl small blocks 3/8, and all big blocks got 3/8.
I'm sure there are some odd ball trucks out there, but this is pretty much the rule.
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Old 04-23-2004, 10:10 PM   #5
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copper?
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Old 04-23-2004, 10:13 PM   #6
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use something other than the stock line to feed a healthy motor even if it is 3/8 the stock sending unit brings the line at a 90 degree elbow and the line cant flow. im running the stock 3/8 line from the tank in the cab and it starves for fuel above 5500 with the victor jr on there. gotta go to a fuel cell and run -8 to the elec pump
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Old 04-23-2004, 11:16 PM   #7
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3/8 line is plenty for a street bound sb(stock or hopped).i run a cell in the longhorn, with 8 an fittings reduced to 6 an, & run 3/8 steel line to the front(stock pump). my 1st run of the season was after work today.......6800 rpms for the 1st 4 gears didnt starve that 383 for fuel. crazyL
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Old 04-24-2004, 01:12 AM   #8
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Do not use copper tubing, a lot of the new fuels and additives will not like the copper. The steel line is a lot more durable and not nearly as soft.
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Old 04-24-2004, 05:49 AM   #9
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i agree ,,,go with steel ....
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Old 04-24-2004, 12:27 PM   #10
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ty guys I ment steel pipes
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Old 04-24-2004, 12:27 PM   #11
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ty guys I ment steel pipes
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Old 04-24-2004, 12:27 PM   #12
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ty guys I ment steel pipes
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Old 04-24-2004, 12:28 PM   #13
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i dont know how I got 2 post of the same?????
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Old 04-24-2004, 12:52 PM   #14
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Quote:
Originally posted by Longhorn Man
2bbl small blocks got 5/16, all inlines. 5/16, all V-6 3/8, all 4 bbl small blocks 3/8, and all big blocks got 3/8.
I'm sure there are some odd ball trucks out there, but this is pretty much the rule.
ANDY -- EVERY BIG BLOCK TRUCK I'VE PARTED (& I'VE PARTED A FEW) HAVE HAD 1/2" FUEL LINES FROM THE TANK TO THE FUEL PUMP. JOHN
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Old 04-24-2004, 12:56 PM   #15
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I am running 3/8 aluminum, much easier to bend than steel. I am running an electric inline pump and inline fuel filter. At those locations I use steel braided Russell size 6 fuel line that I get at the local speed shop.
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Old 04-25-2004, 12:17 AM   #16
Longhorn Man
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John...that is actually what I ment....dunno what I was thinking...heck, i don't even remember typing that.
Thanks for pointing that out.
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