No start quick question

[kwin]

Picked up a 87 burb, its a winter beater for now and eventually will be part of the cummins swap.
It will run when fuel is poured down the throttle body,but not on its own.
Fuel pump is not running, can some one tell me what colors the wiring for the pump are so I can check for power.
I'm trying to avoid dropping the tank some one has installed the skid from hell and I'm hoping not to drop the tank.
any guidance would be appreciated.
It is a 350 tbi.
Thanks for any input.

Keith