I bought the perma cool water fuel separator from Summit.
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I was speaking with a guy from Heath who recommends putting it after the lift pump. There would be a loss of pressure if you mount it before the lift pump. After the LP keeps better pressure since the LP pump is better at pushing than pulling. I know some here put it before the LP to protect the lift pump. Filtration and fuel pressure is more important than the LP. The LP is a relatively small dollar item compared with the rest of the system.
Thoughts? Mount location?