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By you saying the engine "Dies" I am going to assume it restarts. If the timing belt failed the engine would not start again until the belt was replaced. So it could be a fuel or electrical problem.
Check fuel pressure
The fuel pump may be worn out &
binding up every few days & stopping
the fuel to the engine.
Then you have other items that a repair shop
can check, that may be causing your problems.
Most mazdas have electric fuel pumps in the tank,Check fuses and relays first ( relays in engine bay ).If all electrics ok, have a look under the rear seat to see if there is a large 150mm cover plate, remove it and you should see the top of the fuel tank. Unplug the wires , two of them will be for the pump, check to see if there is power when the key is turned on. If not , remove the pump from the tank and get it tested and replace if necessary. Make sure there is no contamination in the tank ( plastic, rag etc ) that caused the pump to fail in the first place.
Try unplugging your Mass Air Flow Sensor (MAFS) - you'll find it on top of the metal body immediately after the air filter. I went through an 18 month ordeal - replaced fuel filter, fuel pump, dropped fuel tank and cleaned it, ran 55 gallons of fuel injector cleaner through the system - nothing! After reading some blogs on this car/engine, gave the MAFS unplug trick a try. The car instantly corrected itself (when you unplug this sensor, the engine control module reverts to factory default, allows sufficient fuel into the engine for unitterupted performance.) However, if this corrects your problem, it's only a temporary fix. Run it about 3 days - it you notice soot in the tailpipe, the factory default is running too rich. Replace the MAFS.
do you mean it wont start ? if it runs but feels like its low on fuer try running it ( not driving it ) with the fuel cap removed and see if this cures it the air vent maybe blocked and causing a vacume in the tank , hence the fuel will struggle to get to the engine , , worth a try
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