Check the electrical connection as it may not have made the connection correctly. Check the fuse, if all are ok, you probably have a bad or wrong fuel pump. It starts when the key is turned to the on position.
Did you put it in backwards?
SOURCE: Gas pump nozzle shuts off off repeatedly when refilling fuel tank
Replace the filler neck that goes to the tank.
SOURCE: location of fuel pump relay (1990 hyundai sonata)
The fuse box is located low on the left side of the dashboard behind a cover, or at the left side kick panel, behind a cover.
Relay Box
-is located under the left side of the dash as well. 
SOURCE: Hyundai Sonata 2003 Car starts then dies immediately :(
dear friend-it appeares that you have no feul pressure,check pressure,feul filter,feul system,
SOURCE: i'm having trouble starting my
i dont want u to be a partz replacer like those dealership boyz-it could be that the fuel pressure regulator is bad-thats why repair manuals r so good-see u r gettin spark but the petrol not there-hopefully the pump was installed rite-now the regulator is in engine area n thats where to concentrate
SOURCE: 2002 Hyundai Sonata have a timing belt or chain
timing belt and yes the belt and tensioner needs changed every 60k and if its a 4cyl. the balance belt also needs replaced
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