Is that with a motor that has been running or sitting long enough to cool off. Mine would still start fine on a cold motor, but once the engine was warm, if I had to restart the truck, it would crank for several seconds before firing.
If you ran your truck below 5psi ever, the fuel metering diaphram in the VP will move up to 2.0mm it is only designed to move 0.5mm. Moving 4x its intended amount will cause cracks in the diaphram that weaken it. The higher pressure put out by the FASS
or sometimes even a new stock lift pump will force the "Cracked" metering diaphram shut, making starting difficult. The metering diaphram is needed pretty much only for hot starts and that is why the truck is effected only on hot starts.
A good test to see if this is your problem, is to disconnect the FASS
from the wiring harness and see if your truck still requires a bit of cranking to start. If the metering diaphram is the problem, no hard start should be experienced. If the trucks starts easily, shut it off, because you're now running without a lift pump and thats no good. Reconnect the lift pump and then hook up an oil pressure switch, that way the FASS
starts once the truck has started. It works like a charm, I have been running like that for a while now and no problems.
I installed my fass
in winter, and didn't have a problem with hot starts until the temps came up a little higher in late spring early summer. So that could be what you're facing here.