Question about 1987 Mercury Grand Marquis

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Diagram for fuel system

Diagram for efi system 302engine

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Http://www.revbase.com/BBBMotor/Wd/DownloadPdf?id=23926


Hope this works. Post back if it doesn't show up.

Posted on Apr 24, 2014

  • montehammons Apr 24, 2014

    Ah yes, the guts and bolts of an early ford efi fuel system: pretty efficient compared to my '87 nissan with a feedback carburetor-which was notorious on earlier year fords, too! But yours is nice. In case you're not versant in wiring diagrams, the link is a 4 page layout of the fuel controls on your car. For the computer, the ECA, to get powered up, the ignition switch in "on" trips the EEC Power Relay on, and power is sent out, both to the computer, and to the controllers like the fuel pump relay, associated solenoids (page 2), and the same power wire from the eec power relay is branched out to all 8 injectors on page 3, and the sensors for computer on page 4. ////so you understand the fuel injection circuit requires power available to all injectors anytime key is on or engine is running. Whe the computer grounds an individual injector circuit, that injector's internal solenoid is energized, opening a tiny hole and fuel sprays out. Thats why fuel pressure is so crucial for fuel injection.

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