TUNDRA TURNS OVER, FIRES BUT WONT START

I have a 2007 tundra 5.7 i recently got new high flow fuel injectors and highflow fuel pump. the truck turns over fine battery is good it fires right up but as soon as i let go of key it dies ive been trying to figure it out for 3 days now. plz help

 

all wires and fuses are good and it does have gas about 1/4 tank

 

If a shop installed the pump and injectors, was it running properly when they gave the truck back to you?

When you say "soon as i let go of key it dies"...Is that a figure of speech, or does the engine literally shut down as soon as you remove your hand from the key?

Your fuel pump should run in the switch "Run" (On) position. Unless new wires were run, that should still be true with the new pump. Turn the key to the first position (Run or On) and listen at the tank for pump operation. If the pump isn't running, verify power to the fuel pump with switch in "Run" position.

 

Just throwin' it out there....check the MAF sensor? Maybe they dint install it completely? So wen it cranks and sucks air, it doesnt sense it and shuts off???

Had an accord do that and MAF was dirty. Cleaned it and it purrrr'd.