87 electric fuel pump ?

[mfencl]

I got an 87 chevy v20 4wd with 350 throttle body in it. I think the fuel pump or something is bad I turn the key and it'll kick on like it wants to build pressure then sounds like its let's fuel come back to it I can hear like a water fall of fuel coming back into tank. I turnes the ignition off and turned it back nothin pump didn't turn on nor the did the fasten seat belt light on the dash. usually when pump does turn on it happens when there's the buzzin noise for the seat belt and the fasten seat belt light comes on any one know what's the cause of this ?
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