95 chevy suburban 454ci 4x4 problem?

sadan2drive

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truck ran ok but when i shut the truck off the fuel pump ran for a minute or so before shuting off. now truck wont start but fuel pump still runs after shutting off. while fuel pump runs, fuel flows out my throttlebody injecters quit a bit untill it drains out the intake throught a screw beneathe the throttlebody. i no ill have to change oil but why does my fuel pump continue to run and fuel runs out injecters.
 
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