I have a 4.3 vortec '98, I change the fuel pump,the spider injection and was working fine, parked the truck for 10 days and won't start,fuel pump doesn't have any pressure,and it's new?Some help pls

first of all make sure your 20 amp fuse is good if it is go down to the pump itself and disconnect the fuel pump four way connector with a test light go between the grey wire and the thicker black (this is your fuel pump power and ground) with a test light that has a bulb not an l.e.d. turn the key on it should light for two seconds then go out and then light again once you start cranking the motor if it does light you got a bad pump or the wire in the unit is bad if it doesn't light try it again from the frame to the grey wire (power) if it lights now you have a bad ground if it doesn't you have no power going to the pump, swap the relay with a known good one if still no power, a professional is required

Agree,

Ok when I turn that ignition on I hear the fuel pump working,but doesn't sent any fuel to that spider fuel injectors

You need to put a fuel pressure gauge on the shredder valve with the pump running engine off you should get 63 psi and after the pump shuts off it should hold if the pump is running and you have no pressure the plastic line connecting the pump to the pump housing either ruptured or came off