SOS 91 fuel injected wont start when hot please help
 

Hey guys i bought a 91 full size blazer a couple months back finally got it running good but now any time i drive for more than twenty minutes the truck will not start once turned off unless i give it an hour to cool down. Its a 4 speed, fuel injected, 350 is they're some kind of fale safe that prevents it starting when hot? PLEASE HELP ive sunk so mmuch money into this truck its practicaly new.