Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Fuel Line Pressure (Except "B" Series Trucks)
1999 Mazda Protege ES, AutomaticSECTION Fuel Line Pressure (Except "B" Series Trucks)
- Disconnect negative battery cable. Install fuel pressure gauge in fuel supply line. Reconnect negative battery cable. Locate data link connector in left side of engine compartment. Connect a jumper wire between data link connector terminals F/P and GND. See Figure. Turn ignition on and observe fuel line pressure. See FUEL LINE PRESSURE table.
- If fuel line pressure is high, replace fuel pressure regulator. If fuel line pressure is low, check fuel pump maximum pressure. See FUEL PUMP MAXIMUM PRESSURE . If fuel pump maximum pressure is as specified, check for plugged or restricted fuel line or fuel filter. Repair as necessary. If no problems are found, check pressure regulator hold pressure. See FUEL PRESSURE REGULATOR HOLD PRESSURE .
FUEL LINE PRESSURE
| Application | Pressure psi (kg/cm2 ) | |
|---|---|---|
| Miata | 53-61 (3.7-4.3) | |
| Millenia | ||
| 2.3L | 41-48 (2.8-3.4) | |
| 2.5L | 38-46 (2.7-3.2) | |
| Protege | 41-46 (2.8-3.2) | |
| 626 | 38-46 (2.7-3.2) | |
RENDER: 1.0x
NO RELATED
Recommended Tools & Savings
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Affiliate disclosure: We may earn a commission at no extra cost to you.
When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.