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Upper and lower fuel lines.. Which is which??

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Old Jun 7, 2012 | 09:45 PM
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Engine: Vortec 4200 Inline 6 PT70 Turbo..
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Upper and lower fuel lines.. Which is which??
Upper line is bigger so its probably the feed line, bottom is the return??
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Old Jun 8, 2012 | 03:24 AM
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Re: Upper and lower fuel lines.. Which is which??
3/8" supply, 5/16" return
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