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.
Education/Credentials GKHS 1985, BVC 1987, MNA 1989, ASE Master Technician Mechanical 1995, ASE Master Body/Paint/Collision 1996
Question Fuel pump will not work. Fuel pump relay has been replaced. The only way the fuel pump will work is by running a jumper wire from terminal gnd to fp in the diagnostic box.
Answer If the pump relay is known good, the pump works during bypass and power is reaching both components.
Confirm continuity at the pump for one. Then from the relay to the pump.
Lines open, does fuel flow when the engine is cranked?, when the bypass is installed?
Check that the Crank Angle sensor is sending A "G" signal (#1) and an "NE" signal (#3&4) (ie: check for spark on all four cylinders)
