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The 2002 Mazda MX-5-Miata runs on regular unleaded.
You can get a 1999 Mazda Miata fuel cap at any auto parts store.
The fuel pump relay on a 2002 Mazda 626 is located in the engine compartment on the driver's side. It is in a bank of relays just behind the battery location.
The 1999 Mazda Miata is a returnless fuel system. It has a Fuel Pressure Regulator in the tank (above the fuel pump), and a snub at the end of the fuel rail.
The 2004 Mazda MX-5-Miata runs on regular unleaded.
The 2005 Mazda MX-5-Miata runs on regular unleaded.
The 2001 Mazda MX-5-Miata runs on regular unleaded.
The 2003 Mazda MX-5-Miata runs on regular unleaded.
in the tank
The 2007 Mazda MX-5-Miata runs on premium unleaded (required).
The 2010 Mazda MX-5-Miata runs on premium unleaded (required).
The 2013 Mazda MX-5-Miata runs on premium unleaded (recommended).