Is A CP4 Injection Pump Replacement DIY Friendly? While DIY replacement of the CP4 injection pump and associated fuel system components is possible, I wouldn't exactly call it friendly.

the risk of a fire, crash, or injury are increased. Dealers will inspect and replace the high-pressure fuel pump as necessary ...

The original fuel pump in the minivan had been replaced because of a malfunction soon after the vehicle was purchased. In October, Honda issued an additional recall over the replacement fuel pumps.