Thanks

Bushwacker you got me thinking -- haven't run it yet but in setting my tanks up (2)each tank has two pickups. I felt that by putting a "T" between the two pickups and running one line from each to one filter with selector valves I would reduce the chance of one of the pickups getting clogged and at least one would continue to flow. Had a problem with a 69 chargers tank pickup when someone slipped a paper towel used to clean the windows down the tank fill ! It would get sucked up shut the car off and then float away after the vacuumed realeased it might be days before it acted up again! Drove me nuts finding it!!!!

my tanks have 1/2 inch suction lines. I was going to have custom suction tubes made for 1/2 " then reduce to 3/8 at water seperators .. you think that is over kill

The 1/2" lines are UNDERKILL! They'll give you about 78% more flow area than the 3/8" line, but by feeding 2 engines from 1 tank you're increasing the fuel flow by 100%, so you'll still have more restriction between tank and selector valve than you'd have if you ran each engine off a separate tank with 3/8" lines! 5/8" lines (178% flow area increase!) would have been overkill! I'd check to see what size fuel lines they recommend for a 300 HP Verado. If they can feed them with a 3/8" line, you still might be ok, but the typical 2-stroke outboard lift pump, which operates off pressure pulses from the crankcase, isn't that strong, so they're pretty sensitive to flow restrictions on the suction side. I'd still recommend putting a vacuum gage between Racor exit and engine to determine how much restriction you have, and also I'd try to find out what the allowable restriction is from Mercury. The DI E-TEC motors are totally different animals from carb'd motors, so their 4" Hg limit on suction side pressure loss might not be applicable to your motors.

Wattaway - at least a total fuel blockage won't destroy your engine because it just shuts down completely. A PARTIAL blockage is more sinister because the resulting power loss is less obvious, especially on a high powered rig, where you might not even notice it until it's too late!

Thanks Bushwacker..
I will call Mercury Guys Tomorrow. They are now in Pc doing there Testing on there motors. I have a friend who works there.. Maybe they can tell me the specs.. I will definitely put a gauge on the load side and see what i get.. I am in the process of mounting my bracket now. and then the engines that way I can see how much weight I need to move around.. Thanks again..