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Thank you for testing and posting your findings with the pump. With your findings i would think the 6-8psi and 35gph airtex E8135 should work fine for the primary pump. It is 3/8 fittings and not 1/8in

The fitting size is not the only difference in the main vs aux pump. The output gpm and pressure are both different. Will an easier to find aux pump work for the main? I dont know...im still trying to figure this out.