Probably fuel filters. Replace one at a time starting with the one in the tank (which can be cleaned and doesn't have to replaced) and see if the problem is solved.

The Power Service may have loosened up some crud and that plugged a filter. I only replace fuel filters when they plug and not on a regular schedule. Why, If no dirt gets in the fuel the fiters, they last for years. If I get dirty fuel the filters will plug soon afterward. and even if I replaced the filter yesterday, it wouldn't help.

Actually, I clean the filters by putting gasoline in them and reverse blowing them out with compressed air. I know the technicians wouldn't do that because their hourly rate is more than the filters cost, but it works for me. MB used to have a fixture to clean the insert fuel filters in the old 190D and the primary filter had a lid that came off and the element could be easily cleaned. That was before shop rates became so ludicrous that the labor charge is much more than cost of the parts.

P E H