T100 Regular Cab Pickup 2WD V6-3.4L (5VZ-FE) (1997)
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Fillpipe Restrictor: Description and Operation
Fillpipe Restrictor
The fillpipe restrictor is used to prevent leaded fuel from being added to the fuel tank. The gasoline pump for unleaded fuel has a smaller nozzle.
The fillpipe restrictor will only allow the unleaded type nozzle to be inserted into the fuel tank.