What a geat board, thanks to everyone that helps! I have a 100 gal built in alum tank that is about 23 years old, made by AFP in Florida (now a diff name) I puled 6" hatch cover to do some maintance and inspection. The tank is in great shape, I will add a pic to the post later, looking down at the tank it has a stand 5 hole elct sender unit, a ground wire, fill tube inlet, vent tube and 2 3/8 pipe fittings holes, one in the center of the hatch is pluged with a sq head pipe plug and the other is the pick up tube.<br /><br />I removed the fuel hose, the nipple was not a ainti-syhon, just a brass barb, no big deal, it was in a SS 90 degree fitting witha screen on the inside. The screen was packed with alum drill chips, more on this later. Then I pulled the sender to get a better look in the tank, no prob there except some grime around and under the gasket. with a light and mirror I look in the tank, the plug hole that is nerest the sender has a tube comming from it that some one has drilled and just chewed up and down througe the side wall totaly destroying it. The plug in the hole is steal and rusted but I put penatrating oil on it and carefuly removed it, the tube easly pushed out of the hole in to the tank. I assume this tube is a return for deisel system but not sure.<br /><br />Now I have a good veiw and acssese to the inside of the tank it is very clean, a few chips of alum in the bottom but not many. I cleaned up what chips I could from the withdral tube and removed the screen, put it back on and conected clear tubing to remove more fuel/chips from the tank by pulling it thru the tube and filltered it into a gas can. Got a lot of chips out!!!<br /><br />Now for the questions, inside the tank both tubes drop to the bottom and then 90 degrees toward the back of the boat, the both go into a baffel and I can't see past that. I am removing all the fuel from the tank now it had about 35Gal left in it. and am using clear line so I can see what comes out.<br /><br />Should I blow the line out and in to the tank before I drain and filter it or just remove the fuel, I get no air bubbles in the tube as I am syphoning the fuel out so I assume that the pick up tube is still good and in the back part of the tank also my boat is tilted slightly so the fuel will run to the rear. <br /><br />I think I have read not to put brass plugs or fittings in alum to avoid corosion, you must put SS between any brass is that corect? <br /><br />Any advice about what I might want and/or need to do would be great, I got a new ainti-syphon valve for it and will install it when I put it all back together. The reasone I took it apart was the motor had a loss of power at WOT and think that may be do to the chips in the line blocking flow to the 200 Johnson OB, ;-) Anyway thanks for any advice you have!<br /><br />Allen
