Just a question

[117mph1999]

Getting ready to replace the CPI unit on my 92 s10 blazer and I've noticed that everywhere and everyone tells me that I have to replace the entire CPI unit and not individual parts. Planning on going out and getting a entire new unit but was just wondering exactly why do you have to replace the entire unit????

[old_master]

You don't! You can service the regulator, pressure line and return line separately for substantially less money. If the injectors have a problem, or the lines to the intake ports, it might be worthwhile replacing the entire unit though.