AboutMp2 Expertise I prefer to answer questions relating to the Miata since this has been my area of specific
expertise since 1991. I can answer questions relating to the other Mazda models however
some limitation of expertise may reduce my accuracy.
Experience Mazda technician since 1987, shop owner and specialty are regarding the Miata since 1991 covering mechanical, electrical, trim and body. Specializing specifically in drivability concerns.GKHS 1985, BVC 1987, MNA 1989, ASE Master Technician Mechanical 1995, ASE Master Body/Paint/Collision 1996
Education/Credentials GKHS 1985, BVC 1987, MNA 1989, ASE Master Technician Mechanical 1995, ASE Master Body/Paint/Collision 1996
Question I have about 70000 km on the car. The fuel gauge reads about a quarter full and does not move up to full. Is this a faulty sender? Can I replace the sender without dropping the tank. Is this where the fuel pump is too? Is it advisable to replace the fuel pump at the same time? Or might this be a faulty gauge?
Answer Only diagnostics will tell for sure. Sending units and gauges seldom fail however, the fault would mainly lean toward the sender as it is electro-mechanical and corrosion and wear can play a role. The pump, regulator and sending unit are on a shared assembly which is accessible through access panels under the rear package shelf. Specialty tools are required to release the vapor lock fuel lines. Removal of the tank is only required if heavy corrosion is present inside, tank removal is a major operation requiring the rear suspension and cross member to be removed.
