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.
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HOMESERVICE MANUALSMERCURY1987LYNX L, MTXIIIREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMFUEL INJECTION SYSTEM - 4-CYL DIESELTESTINGFUEL SYSTEM TESTINGINJECTION PUMP TRANSFER PRESSURE
1987 Mercury Lynx L, MTXIII
Injection Pump Transfer Pressure
1987 Mercury Lynx L, MTXIIISECTION Injection Pump Transfer Pressure
- Remove banjo bolt from fuel return line. Install Fuel Line Adapter (10326) in banjo fitting. See Figure . Connect adapter line to 0-160 psi (0-11.25 kg/cm2 ) pressure gauge. Run engine at 4000 RPM under no load and transmission in neutral.
- Pressure reading should be 70-110 psi (4.9-7.7 kg/cm2 ). If not, replace injection pump.
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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.