[DIAGRAM] 1990 Mazda Miata Engine Diagram

The "returnless" part of the NB system means that there is only one fuel line that goes from the back of the car to the front of the car. Once fuel goes up that line, it never returns to the tank. Most cars built in the last 15-20 years do this because a trip through the engine bay heats up the fuel and that increases evaporative emissions.. Fuel System - MX-5 Miata. Fig. 1: Fuel System - Flow Diagram Courtesy of MAZDA MOTORS CORP. FUEL SYSTEM LOCATION INDEX [LF] ENGINE COMPARTMENT SIDE 2008 Mazda MX-5 Miata Grand Touring 2008 ENGINE Fuel System - MX-5 Miata Microsoft

Fig. 1: Locating Fuel System (BP, Bp With TC) Components Courtesy of MAZDA MOTORS CORP. BEFORE SERVICE PRECAUTION (BP, BP WITH TC) 2005 Mazda MX-5 Miata. Don't 'improve' any system you don't fully understand. Nothing you can do to/for the hoses is better than Mazda or industry standard hoses. Not all Miatas have drain fittings for the gas tank. Running the fuel pump using the FP/Gnd short in the diagnostic box on the driver side fender pumps most liquid out of the tank.