03 Sierra Fuel Pressure

[kkaupang]

I have an 03 Sierra Half Ton when the engine is warm it runs fine
but at cold start, half the time it doesn't have the fuel pressure to start, i have to turn the key a couple times to build it up. idk if the fuel pump is weak for if it would be more the regulator
i started having this problem after i replaced the fuel pump.
the fuel pressure gauge shows 50-55 lbs, but every now and then when its cold it will only jump to around 5 lbs (but this is only when the engine is cold... why?)

What should i go after first? Regulator, new pump, Replace the fuel filter again?

Thanks

[maxwedge]

Pump. and check for a burnt connector at the tank.

[kkaupang]

Fuel Pump ended up going out on me the other day, New Airtex Fuel pump, new fuel filter, and new wire harness for the pump. Now she runs Great!