Join Date: Jan 2014
Location: Northern California
That pretty much narrows it down to the three you have listed.
A new fuel pump is cheap.
After that I’d swap back on the stock ecu to see if it Breaks up
08 KFX450r- DASA, FCI, Stg 2 Hotcams, Wiseco FI, Dynatek Coil
Race Tech dual rate front springs, GT thunder XC Link and Race tech spring, LSR +2 Arms and LSR Axle
Poly Case Saver, Streamline Stabilizer, PRM Skidplates, Pro Armor Bumpers, Tusk Heel Guards, IMS 3.7 tank, 6K HID
Next up: Dasa Port Job, JE Pro 12 12.8 piston