Question about 1989 Mercury Cougar

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1989 cougar wont start

My problem is my 1989 mercury cougar wont start my fuel pump runs and i have pressure to the fuel rail but the fuel pump wont shut off i have replaced the fuel pump relay and filter also pulled out the tank to check for gunk on the pump screen and to no avail

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  • falk_74 Jan 09, 2009

    no i have checked that and it is working fine also like i said the pump is constantly runningbut wont shut off after the rail builds pressure but thanks for the help

  • Anonymous Mar 17, 2014

    Need a Fuel pump &Pump Moduel Wiring diagram to Check Voltages

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Is the inertia switch on the passenger kick panel popped?

Posted on Jan 09, 2009

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There is a fuel pump shut off switch in the 89 cougar LS, its in your trunk on the left side behind the apolstry, if the white button is up push it back down to reset it...

Posted on May 25, 2009

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did you change the fuel filter. do you know its getting fuel to the fuel rail. is the fuel pump the reason it died ???

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The fuel pressure sensor is not the actual pressure of the fuel in the rail,it is in the evap (emmissions) side.Just vapors,shouldn't make the car run poorly. Low fuel pressure is a different problem,I would check the pressure regulator first (under hood,on the fuel rail),make sure the vacuum hose is ok and pull the hose off the regulator and make sure there is NO fuel in the hose.20 min,that seems odd ,try it with the gas cap OFF ,maybe there is too much vent. Only thoughts I have ,good luck!

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If it is getting spark I will assume the timing belt is working.
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From your saying looks like you have a feeding problem. Do you hear the fuel pump working? if it is working check by using the fuel pressure tester how much is the flowing pressure and if it is in the recommended pressure flow. Also check even after the fuel filter if the fuel is flowing into the rail and the pressure regulator is working. Last check if your injection system is working ,if the ecu sends a message to the injectors to work.

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Check your local library for repair manuals...

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