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Old 08-28-2012, 07:21 AM   #1
TobyArnot
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They say "the only dumb question is the one you didn't ask" !

O.K. What size is the fuel line from the tank to the engine, 5/16" or 3/8"?
Thanks in advance for the help!
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Old 08-28-2012, 08:56 AM   #2
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Re: They say "the only dumb question is the one you didn't ask" !

Mines 3/8. Maybe 5/16th for the six cylinders?
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Old 08-28-2012, 09:31 AM   #3
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Re: They say "the only dumb question is the one you didn't ask" !

Yep 5/16 for 6 and 3/8 for V8.
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Old 08-28-2012, 09:37 AM   #4
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Re: They say "the only dumb question is the one you didn't ask" !

But if the truck was converted from original motor, either six to eight or eight to six, you may have the opposite.

I converted my 69 from six to eight and used the 5/16th that it originally had with no problems. I'm sure the opposite is true.
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Old 08-28-2012, 11:03 AM   #5
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Re: They say "the only dumb question is the one you didn't ask" !

Either will work. I ran 5/16's until I switched ou the sending unit, then I went all 3/8 since it needed replaced anyways. The 5/16's will feed most normal V8s just fine, now souped up ones....it runs a little low on the flow.

To me if you have to replace it, I'd go with 3/8"s regardless.
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Old 08-28-2012, 12:00 PM   #6
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Re: They say "the only dumb question is the one you didn't ask" !

O.K. Thanks, My stepper was a factory V-8, so I'm guessing 3/8". I want to plumb up a new bed mounted tank and needed to make sure I have all I need before ripping it apart
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Old 08-28-2012, 12:03 PM   #7
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Re: They say "the only dumb question is the one you didn't ask" !

5/16th for six cylinders and 307, the bigger V8's are 3/8th inch.
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Old 08-28-2012, 02:48 PM   #8
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Re: They say "the only dumb question is the one you didn't ask" !

I've always thought more is better and size does matter
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Old 08-28-2012, 02:55 PM   #9
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Re: They say "the only dumb question is the one you didn't ask" !

I just swapped out my 292 for a performance 350 and have had no trouble with the stock 5/16" lines.
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Old 08-28-2012, 03:24 PM   #10
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Re: They say "the only dumb question is the one you didn't ask" !

6 cyl and 2 barrel v8's used 5/16".
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