fishnfowlr
New member
First off, I have a 1994 Mercury 225/3/0L. Recently I've experienced low fuel pressure to the point of having to pump the hand bulb to get the motor running up to full speed. I rebuilt the fuel pump (but all the diaphrams, ect. looked good from what I replaced). I replaced all the fuel lines from the tank to the carb. I pulled all three carbs and cleaned all jets and inspected the float, needle and seat for proper operation. I replaced the fuel/water separator. Today, while Isaac rained on my parade, I decided to dig a little further. Thinking the hand pump check valve may have been faulty in the new pump, I replaced it again and went to a larger, 3/8 fuel line. Still, I couldn't get good fuel flow. I pulled the stem from the bottom of the valve from the fuel tank. The filter in the bottom of the stem is clean. I unscrewed the valve off the top and it has a spring loaded check valve where the main fuel line hooks to the tank. Is this check valve necessary? I took carb cleaner and did my best to clean it. It still takes a certain amount of pressure to pull fuel from the tank. I'm thinking that this extra pressure is what's keeping my motor from running properly. I have a check valve in the hand pump. Do I have to also have another check valve coming from the top of the tank? One thing I have not checked but have heard about is the reed vavle. Not sure where it's located but I do have the specs on the opening of each reed. Any help would be greatly appreciated. Brad