The things connected to fuel are 1: fuel tank should be good after service. 2: fuel pump will probably be good after service. 3: fuel filter should be replaced at service. 4: injectors should be good after service although you might run some kind of fuel additive for cleaning fuel system after service. 5: Spark plugs should be changed at service. 6: Combustion chamber should be OK. 7: Catalytic converter should be good but some life taken out of it.