It will not take 10 seconds for the fuel to get to the eng, or it should not. Go to the DIY section and do the fuel sys diganosis test. Again, it could be the pump, FPR, filter, check vlv, etc. or it could be something else, but I am leaning toward fuel sys. I would definitely start with the fuel sys diganosis. If it is the fuel sys the most important t/s item is the fuel pressure gage it tell you alot, if not the fuel sys it will tell you immediately the fuel sys is operating normally. The gage can be bought for about $45 from Orileys or leased from autozone for $160, the 160 is refunded when the gage is returned, therefore it is considered a loaner tool.

When the truck does run, does it run smooth, surge, bog, miss, whatever?