I'm having start up issues with my redtop SR20det. The engine will turn over and run on the first turn of the key.
After cutting it off and cranking it again, the engine doesn't want to turn over. You have to wait about 3 hours to crank it again and it'll turn on the first turn.
Even jump starting it won't even help the engine turn.

MODS to Fuel and Electrical:
-255 walbro fuel pump
-z32 fuel filter
-Nismo FPR Type-A
-stock injectors & fuel rail
-NGK spark plugs
-Westco Mini Battery 12v


I've checked the grounds, fuel lines, and charged the battery. Fuel is coming through and I can hear the fuel pump work when turning the key onto accessories. The battery charger reads off around 12.1-13 volts every time I charge the battery. I know it is either a fuel or electrical problem, but I can't narrow it down.

Start by checking your codes. id say start with the coolant temp sensor for the ecu.

It sounds like your motor is flooding. Check your oil; I'll bet it smells like gas.
What's your fuel pressure set at on the FPR? Do you have a wideband? If you're wanting to just start replacing things, do what compacfean said and start with the CTS since the CTS has been known to cause over-rich issues.