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I have a f300 with aprox 2,500 hrs on the engine, I have had a few instances where I would just be idling and the motor would quit, I determined it was the low pressure fuel pump, after pumping the ball and getting gas back in the vst tank it would start and run fine, this had happened about 5 times in 60 hrs, I have replaced the anti siphon valve, all new fuel line and filters to ruel out an air leak, today I took it out and it ran perfect, ran about an hour, shut it down and swam for a while, then when I started it up and headed home it shut down, again I pumped the ball and it started up and ran great the rest of the day, the low pressure pump is either failing or not being told to turn on, I looked for a relay for it but could only find the relay for the high pressure pump, any imput is greatly appreciated