Eddie, you have always been willing to help and might I add, with good info. I do not get the above comment from P31 either. thanks !

Thank you. I'm not sure what it means either. I don't know if it was meant to be sarcastic. I certainly hope it was, or we are going to have some problems.
I have done EVERY boat's fuel plumbing the way I described and it has worked flawlessly. Several pleasure boats have been well beyond 1400 hp. I will not give a customer a boat with a filter that is seeing pressurized, unregulated fuel. A Weldon pump can make over 80 psi unregulated and a water seperating filter was never designed for that. I have also worked with several boat manufacturers and I have yet to see one of them plumb the water seperator after the pump. Merc. also puts the filter before the pump.
Eddie

That by no way was a shot at you eddie !!!!!! You had to have read the comments that have since been deleted by some know it all. I think it is great that you take the time to share your wealth of information with all the members on here.

P31 was defending you. I edited my post after reading it over I added more detail. If your way works then stick with it. I am using High Pressure aftermarket water separators. I have been using this setup on my personal boat since 2002. They have a petcock on the bottom and the filter can be drained. I have never had any rust ever accumulate in my filters. The comment you made about rusty filters kind of irritated me. I have never tried to be a know it all. I just give comments on my experience. Were do you locate the water separator and pump?

Sorry JeffP31. I wasn't sure what it meant, that's why I asked. It makes sense that posts were edited, that is why I wasn't sure what was meant by it. Again, thanks and sorry.

jeffswav, why would a comment about rusty filters annoy you. I have seen more that I can count. They may have been older filters that were run in salt water, but they were full of rust, both in the filter and all around the top. What you are using is fine...a HIGH pressure filter/seperator that is made to handle the pressure. Someone could misunderstand that and try to use a standard filter in that way, which is not made to be pressurized. If your way works, then use it. I was just relaying the way I do it that has worked for me. There is more than one way to skin a cat.
One other added benefit of having the filter first is that it acts as a reservior for the pump to draw from. I try to use at least a one quart filter. It will absorb any pulses and keep the pump primed at all times. I try to mount them as low and as close to the tank as possible. I want the pump and filter no higher than the top of the tank. None of these pumps are very good at pulling. Pumps are made to push fuel, so the closer they are to the tank, the better.
Eddie

I just took it the wrong way. Glad we cleared that up. I can see were a engine builder would rather do it your way. If the owner fails to maintain the system you may be held liable. I change my filter every other year, and empty a couple of times per season. My boat is run in fresh water and stored in by building. Some boats must be difficult to install a large separator so low in the bildge. I have a small inline filter just after the tank, then a short hose to the pump, then up the the separator in the stock location.

Unfortunately, not everyone maintains their boat like you do. Liability is the biggest problem since most do not maintain their boat like they should. Sometime it is tough to get a large filter down low. I will go to a smaller one if I have to in order to keep it at or below the top of the tank. I would rather have a smaller filter below the top of the tank rather than a larger filter above the top of the tank.
Eddie