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www›Search›gm fuel line adapter3/8" GM Fuel Line Adapter Mastercool 71406 MSC See more like this. SPONSORED. AN -6 AN6 Fuel Adapter Fitting to 3/8" Rail line GM Quick Connect Clip Female B. Brand New. And R Auto Parts 38180 180 Degree GM Fuel Filter Line Adapter (1) Brand New. $11. List price: Previous Price $12. or Best Offer +$2 shipping. 6% off.