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

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Old 06-07-2012, 09:45 PM
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Engine: Vortec 4200 Inline 6 PT70 Turbo..
Transmission: 4L65E
Axle/Gears: 3.73
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 06-08-2012, 03:24 AM
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Car: 1967 Camaro, 91 z28
Engine: Lb9
Transmission: M20
Axle/Gears: J65 pbr on stock posi 10bolt
Re: Upper and lower fuel lines.. Which is which??
3/8" supply, 5/16" return
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