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So I took my car out for the first time in quite awhile and when going over about 5500 rpm it’s hitting what feels like fuel cut but it was absolutely fine before hand. The only thing I’ve changed while it’s been parked up is the fuel pump and fitted the updated walbro 255lph pump.

my question is with fitting an aftermarket fuel pump should I also have fitted a fuel pressure regulator and is this the issue? 
 

thanks in advance 

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