Inside the fuel tank... the tank must be dropped and the filter is part of the fuel pump assembly which includes the pump, filter and pressure regulator. Most parts stores have the whole assembly for around $200 - $250. You can do it yourself, but plan on about 3 hours for the whole job. JUST TO REPLACE A FUEL FILTER!
Fuel filter on Mazd MPV is located in the fuel tank.
Inside the fuel tank
Replace it when it's dirty.
in the pump, which is in the tank.
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Fuel pump is in the gas tank,access from under the carpet behind the passenger seat
The fuel pump is mounted on top and inside the fuel tank. The filter may be integrated into to fuel pump or it will be located between the fuel tank and the engine.
on an '01 Mazda MPV the fuel pump is on the left side of the vehicle. older MPVs have it on the right
there is a good chance your timing is out or your fuel filter needs replacing
this is a fuel filter from a 2001 Mazda mpv i could not put a picture on this but here is a link to one and you can buy it if you need to: http://www.autoanything.com/Parts/PartsProduct.aspx?CategoryID=1944&kc=FFPMM&TemplatePageID=201&SiloName=filters-80-2398-2001