Wagoneer L6-242 4.0L VIN M FI (1988)
Fill Pipe Restrictor
A small diameter fuel tank filler tube neck is incorporated to prevent the larger service station nozzle, used for leaded fuels, from being inserted into the
filler tube, thereby preventing system contamination. Since the use of leaded fuels contaminates the catalyst, deteriorating its effectiveness, the use of
unleaded fuels is mandatory in all vehicles with catalytic converters.
