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 MANUALSBMW1993740IL (E32/2) V8-3982CC 4.0L DOHC (M60)REPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSDESCRIPTION AND OPERATIONENGINE CONTROL SYSTEM INPUTSFUEL TANK PRESSURE SENSOR
1993 BMW 740iL (E32/2) V8-3982cc 4.0L DOHC (M60)
Fuel Tank Pressure Sensor
1993 BMW 740iL (E32/2) V8-3982cc 4.0L DOHC (M60)SECTION Fuel Tank Pressure Sensor
The fuel tank pressure sensor input to the ECM, is provided by the pressure transducer mounted on the liquid vapor separator. The input is used by the ECM to check the fuel storage and purge system for leaks as part of the OBD II emission requirements. The pressure sensor receives its power supply from the ECM and produces a varying voltage input to the ECM, representing the amount of pressure in the fuel tank.
Monitoring the purge system for leaks is an output control function of the ECM. If a malfunction occurs, the MS41.1 EQM will discontinue the purge system monitoring and the fault will be stored in memory.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- β’ You smell fuel, burning insulation, or see smoke.
- β’ Brakes feel soft, pull hard to one side, or make grinding noises.
- β’ The engine overheats, stalls repeatedly, or misfires under load.
- β’ You are missing required tools, torque specs, or safe lifting equipment.
- β’ You are not confident in the next step or safety outcome.