Not all fuel filters are internal or built into the pump assembly. Most fuel filters are still external and can be replaced separately. If a vehicle was built with an external filter, it will always have an external filter. If a vehicle was built with the filter built into the pump assembly (an internal filter), it will always be that way. There is no switching back and forth. The vehicle models that have a filter in the pump are considered “lifetime of pump” filters and should not need replacement. These filters are not serviced separately.
Are the new fuel filter replacements now internally built into the fuel pump assembly? Why are they different and what has changed?