Mercury Repair Questions? Ask a Mechanic for Answers ASAP
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The 2002 Cougar 2.5 V6 is equipped with a fuel system called electronic returnless. there is a fuel pump driver module in the rear compartment that varies the duty cycle of the power being applied to the fuel pump in response to a pwm signal from the powertrain contrl module.
There is no mechanical regulator on this stem. It uses a fuel rail temp and pressure sensor to gather feedback info for the pcm to allow it to alter the pwm signal to the driver module as necessary.
If you use a voltmeter between the feed and ground wires at the pump, you will see 6 to 7 vdc at idle, and as load is applied to the engine you will see this voltage increase as the dutycycle to the pump is increased to increase the amount of fuel being delivered by the pump.
The most common problem with this system is a blocked/restricted strainer in the fuel tank. This will starve the fuel pump. If this filter is found to be dirty, the tank will have to be drained and cleaned.
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