On marine applications where lives are at stake, 3 micron ABSOLUTE is the industry standard. The problem that I see with the filtering put out by the aftermarket fuel pump companies can in no way handle the flows & pressures advertised. It is completely impossible to flow 150 GPH at 18 PSI with any decent filtering with the units they sell.
I often wondered about that, right now my idle pressure is 15, and it drops to no more than 14 at WOT. If I install say a 3 micron, I wonder if I will drop more at WOT due to a more restrictive filter.
I would leave the amount of filters you have where they are. You can create problems with too many filters. Get some good quality 5mic or less absolute filters to install on the airdog and be done.
On my truck I have a raptor 150 with a drawstraw in tank and all 1/2" lines and -8 fittings no banjos. The way my fuel flows is this:
Drawstraw from tank
To a pre screen in line filter (wire mesh just catches big debris, not a filter but a pre screen.
Then to raptor
Then to a FS 1001 which is a 10mic water/fuel filter
Then to my FF 5320 which is. 2mic (5mic absolute) filter
Then to factory filter can with a 3rd gen filter in it that filters to 7mic as a just in case, water in fuel, fuel heater
Then to the vp 44
I see 19.5 psi idle
18-19 psi cruising
And no less than 17psi ever at WOT
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