Hi,
It's under the hood on the driver's side. See pic 1.
Here are the directions for replacement. Pic 2 correlates with the directions.
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1999 Mazda 626 ES L4-2.0L DOHC
Fuel Filter Removal/installation
Vehicle Powertrain Management Fuel Delivery and Air Induction Fuel Filter Service and Repair Procedures Fuel Filter Removal/installation
FUEL FILTER REMOVAL/INSTALLATION
REMOVAL
1. Release fuel pressure.
See: Fuel Pressure Release > Service and Repair
2. Disconnect the negative battery cable.
3. Remove the cruise actuator with the harness and cable connected.
Pic 2
4. Remove in the order indicated in the table.
INSTALLATION
1. Install in the reverse order of removal.
2. Complete the "AFTER REPAIR PROCEDURE".
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Let me know if this helps or if you have other questions.
Take care,
Joe
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Thursday, June 11th, 2020 AT 9:35 PM