Yep, top one is regulator and return, bottom one is inlet. If you remove the standpipe inside the bowl there is a valve in there that will not let fuel in the bowl unless the cap is on. Simple to remove from the standpipe. Punch it out with a screwdriver. That removes a restriction. where the fuel lines go into each head there is a fitting, inside that fitting is a one way valve. Simple to remove with a drill. You can also bore it out a little and make it a little bit larger (I hate fuel flow restrictions), make sure you take the time to remove all burrs from the fitting before reinstall, if there is anything in there, the only way out is through the injector. On the fuel drain there is a short rubber hose that goes to a fuel line than routes it down the front of the motor and right onto the crossmember. Any leakage from the bowl (they do get old and porous, sometimes they even get hairline cracks) will leak into the valley between the heads and make Lake Powerstroke. There is a drain hole that routes this fuel out the back of you motor, right on your flexplate if an auto (no real biggie) or right on you pressure plate if a Standard (a real big deal). Sometimes this drain hole gets plugged up from debris falling down there or from a previous owner that thinks he is stopping stuff from getting inside his motor (WTF did Ford leave a big hole in the valley, hmmm, a cork will fix that).
(mainly me).
