When I bought my boat a couple of years ago, the squeeze bulb would never pump up hard but, after a fair amount of squeezing (perhaps a minute or more), it would send gas enough to start the motor. It no longer will deliver gas. I put on a new squeeze bulb (and, yes, I have the arrow pointed at the outboard. Problem still there. I pull the connect off the hose at the motor end and squeeze and fuel pumps out all over. I put my thumb over the end of the hose and I can feel gas but the squeeze bulb still doesn't get hard. I don't really understand how this works but it seems that there needs to be pressure on the line to force fuel into the motor for startup. I've checked the hoses from both tanks, the caps on both tanks, switched the lever from port to starboard tank and examined every inch of hose (heavy hose of the right kind for fuel) and everything appears fine. No leaks and no smell of gas anywhere. When I use my 3 gallon tank to get some gas directly from the small tank to the motor, it pumps up hard and puts gas into the big motor (1986 Evinrude 50) and the motor continues to run fine when I switch back to the 12 gallon tanks in the boat. Of course, when I stop the motor, it will restart because there is gas in the carb but it won't start a few days later without using the small tank and hose to get gas to carb. Any idea where to go next?