firehawk

Today I went to start my truck and noticed when I turned the my FASS pump cycled but the pressure only came up to about 5 PSI and after them pump shut off the pressure dropped real slow. Normally it goes to 15 PSI then drops right back down to 0. I cranked the truck and it fired up for about 2 seconds and died. I cranked on it and after about 5 or 10 seconds the fuel pressure came up to 15 psi, the truck started and everything was normal. This had happened once before then hadnt for about a month. Any ideas? The FASS has about 10,000 miles on it.