I have a 99 k2500 with a 7.4 motor. When I go to start it in the morning it starts right up then I'll drive it to work.
When I go out to lunch to start it I'll have tocrankfor a little bit before itstarts. I have checked the injectors for bleed off,andit has a new fuel pressure regulator. new plugs, wires ,cap and rotor button. the fuel pump is 18 months old ( it is a ac delco pump)fuel pressure is 56 psi. The fuel pressure drops off 6 pounds in 5 minutes with the engine off.

I would appreciate any help to resolve this problem

Joe

 

Fuel pressures are within spec, are these the same pressure readings when the engine is not starting quickly?
Can we assume that a new fuel filter is installed?

Have you checked for any stored DTC's?
Such as P0338 ?
There is an updated Crankshaft Position Sensor, P/N 10456607 that addresses this condition (and several others) but it is a waste of money if code P0338 is not set.

Also could be dirty fuel injectors.

 

There was a new fuel filter installed, and the injectors sent out to be cleaned and checked.
If there was a po338 in the dtc wouldn't it give me a check engine light?