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 MANUALSVOLVO1996850 BASE, 4D WAGON, STANDARD, M59REPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEMENGINE CONTROLS - BASIC TESTING - TURBOFUEL SYSTEMFUEL PRESSURE
1996 Volvo 850 Base, 4D Wagon, Standard, M59
Fuel Pressure
1996 Volvo 850 Base, 4D Wagon, Standard, M59SECTION Fuel Pressure
- Before disconnecting, cover fuel line connector using shop towel to absorb any fuel spray. Connect Fuel Pressure Gauge (5011 ) between fuel line and fuel rail. Seal free end of hose using Plug (5266 ) or use Fuel Drainage Unit (981 2270 , 2273 and 2282 ).
- Remove fuel pump relay. Connect a jumper wire between relay terminals No. 1 and 3. See Fig 1 . Turn ignition on. Fuel pump should start. Fuel filler cover can be removed to determine whether main pump is operating. Fuel pressure should be about 43.5 psi (3.0 kg/cm2 ). If pressure is not to specification, replace pressure sensor.
- To check fuel system residual pressure, turn ignition off. Disconnect jumper wire between relay terminals. Reinstall fuel pump relay. System pressure should not drop below 29 psi (2.0 kg/cm2 ) in less than 20 minutes. If pressure is not to specification, check injectors, connections, and fuel pump non-return valve or lines. Repair as necessary.
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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.