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Re: 07 fuel lines
There should be a pressure line, a return line, and an EVAP line from the tank to the engine compartment.
You will have to be more specific about the fitment problems. The nylon is necessarily smaller than the barbed fittings designed for it, and the hose needs to be controlled heated and accurately pressed onto the barb. They are not hand-assembly fittings.
Alternately, the hard line ends of those fittings should be very close to the nominal line sizes since they rely on an O-ring for sealing. If the size mismatch is there, a 3/8" fitting will not fit a 10mm line, and vice-versa.
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