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First off if you went to the trouble to remove the fuel pump you should have just replaced it with a new one. Hopefully you replaced the fuel filter. If not install a new one. You cannot clean a fuel filter. You need to make sure the fuel pump is actually working. Have someone open the fuel filler door and remove the fuel cap and listen at that location. Turn the ignition key on but do not start the vehicle. You should hear the pump run for a few seconds and then shut down. If you do not, check the fuse and fuel pump relay. If you do hear it run that does not necessarily mean it is actually pumping fuel. The only way to know for sure is to run a fuel pressure test at the fuel rail. You will need a fuel pressure gauge in order to verify this. If you do not hear the fuel pump run then either the fuse is blown, relay is defective, or the wiring to the pump is either loose, corroded, or disconnected. Any decent mechanic can solve this problem.

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Q: Why a Mazda MPV doesn't work anymore after remove the fuel pump and clean it?
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