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Hey bloo, When you replaced the risers were the manifolds clean inside,sometimes they get built up with scale.Take the ends off and clean out with a thin threaded rod. Another thing you can check.The gasket between the manifold and the riser. there is a difference between fresh and salt water cooled,fresh water cooled restricts or stops flow from the manifold to the riser with two gaskets and a stainless plate , salt water cooled only uses one gasket.Don't be afraid to check the sending unit and guage,Good luck let me know how you make out.
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