Replaced fuel pump and filter and car still wont start. Have new battery, starter, water pump...
I saw what you replaced, didn't see any testing? Make sure battery has a full charge and battery connections all good, that is positive and ground, both are important. Check fusible links where applicable? Do any electricals work, dash lites--headlamps--anything?
If needed check fuses in fuse box for voltage use a test lite. Some fuses are hot all the time, some go hot with the key on. Just pick any component that isn't working and is fuse protected, check voltage at the fuse.
The starter motor usually has two voltage circuits, one comes from the battery, hot all the time. The other circuit should go hot with key in the crank position and is wired through neutral or clutch switch, depending on the tranny. It is possible to be wired through starter relay, depending on the vehicle. Any starter testing, make sure tranny is in park or neutral and parking brake is set.
I need year--make--model.
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