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Seafoam maybe hard on plastic lines
buddy of mine used seafoam on his 87 trailblazer and soon his feul injection "spider" (lil hoses that throw the fuel to cyclinders on the 4.3 v6) where all hard and developed pin holes after new feul pump, line then finally the "spider" and supply hoses he only had the problem after he added the seafoam..not sure was cause but he blames it lol
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