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I have vortec v8 engine. Never had any issues cold cranking it. Recently, takes longer to start. No other issues. No hesitations or other. Priming fuel system by turning key on three times
And waiting doesn’t improve. Once it starts, it restarts easily like it always has started before on a cold start. I have not hooked up a fuel pressure gauge yet. Thinking I’m losing fuel pressure between starts overnight. Not sure. Want to know what everyone else thinks.

thanks.
 

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‘01 Silverado 2500HD 8.1/Allison 5sp xcab long bed
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Time to check your fuel pressure.
 

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Turn key on, wait 10 seconds then try to start.
If it quickly starts, you are losing prime due to overnight bleed down,
It's probably the pump, or a crack in a line; but it could be injectors leaking.
 
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