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Just one post is needed here. Our Onan tech stays very busy and has a day job so be patient and he will get to your question.
If you respond to my post here he can't answer your question........
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You do not necessarily need an Onan pump, although I highly recommend it, but at 6 - 7 psi, that pressure is way too high.
Nominal pressure should be 3 - 3.5 psi, but should never go over 5 psi.
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