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Dan, Technician
Category: Car
Satisfied Customers: 24587
Experience:  Independent Shop Experience, 2 Year Automotive Diploma, & Access to Information Database
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98 mpv: wont all fuse r good new fuel pump

Customer Question

i have mazda 98 mpv fuel injactor wont work all fuse r good new fuel pump
Submitted: 7 years ago.
Category: Car
Expert:  Dan replied 7 years ago.
None of the fuel injectors or only one? How do you know they arent working? Thanks.
Customer: replied 7 years ago.
no gas to the cylinder only run with starting flud or if u pour gas in the trouboudy
Expert:  Dan replied 7 years ago.

Have you done a fuel pressure test? If so what psi is key on engine off? If you havent doen a fuel pressure test thats what you need to do. If its low replace the filter and check again if still low verify the pump ha good power/ground and replace. Let me know if you have questions, thanks.


Fuel Pressure
Pressure 1 (PSI)Pressure 2 (PSI)Pressure 3 (PSI)
38.0 - 46.0Y00128.0 - 38.0Y00264.0 - 85.0Y003
Y001: System pressure (PSI) with vacuum hose to fuel pressure regulator disconnected.
Y002: System pressure (PSI) with vacuum hose to fuel pressure regulator connected.
Y003: Fuel pump pressure (PSI).

Customer: replied 7 years ago.
i have the right fuel pressure the book say 65 to 80 i have 73 psi it has a new fuel pump it runs on starting flued or if i pour gas in the throbody all fuse r good fuel pump working have spark no gas to cylinders 98 mazda mpv with a 3.0
Expert:  Dan replied 7 years ago.

Ok, then your fuel injectors arent firing. Try to swap the main relay with another one to see if that helps. Check to see if the relay clicks if not check for good ground and good power. If no power check 15 amp engine fuse. If the relay does click then check to see if the 30 amp EGI fuse is good and the 40 amp IC key fuse. Here is a wire diagram of the injector system, let me know if you have questions. Thanks.