normally electrical issues occur all of sudden...like fuse blown and car refusing to start again...
fuel injectors are pretty tough...you can feel them working even by touching them...and if the car is starting okay and i think injectors are fine...but if the fuel regulator is missing....then it means that fuel return line will be blocked as well...put everything back into system...
desi mehcnics do that to mask the failing or weak fuel pump...which can only be checked testing thru a proper guage.