zspeed10
+1y
With the cars I work on...
Pulse dampeners are important. They'll keep the fuel pressure even, which keeps your idle and acceleration even.
You could research injector latency and its relation to fuel pressure if you want more information as to why the pulsation dampener is important.
Short story is, the injectors cause the pulsating, the pump pumps at a relatively steady rate and fuel will not squirt out of the injectors in a steady stream without it.