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    Fuel pump

    My 90 wagon has been sitting for 1.5 years went to start it and no fuel pump
    Hum when the key turned on.
    Swapped out the fuel pump relay and still nothing. So changed the pump
    And still nothing. Is there a fuse or fusible link I’m missing ?


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    #2
    Should be a fuse and also a fuel pump protection module (normally in a trunk but somewhere in the back of a wagon). Wagon "buffs" here can post where exactly it can be found. It cuts off the fuel pump in case of a rear end crash.
    What I Own: 1993 Mercury Grand Marquis GS
    What I Help Maintain: 1996 CV / 1988 CV / 1988 Tempo

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      #3
      Inside the drivers side panel near the tail lights.
      90 Colony Park LS with GT 40 heads and intake. HO cam, 65 MM TB, 67 MM EGR spacer. Has a 75 MM Pro Flow mass air sensor. Borla XS mufflers. 3L55. Shift kit, 2000 stall Tq convertor...Bilstein shocks, front and rear sway bars.
      90 Colony Park LS 64,000 miles all original. 3L55 tow package....front and rear sway bars.
      91 Grand Marquis GS....HO motor..Bilstein shocks poly bushings and police swaybars. This one handles the best.
      70 Torino Squire with M code 351 Cleveland 3.00 has Magnaflow mufflers. Hidden headlights and power windows. All original

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        #4
        The inertia switch (cuts out the fuel pump in case of a collision) in wagons is usually in the dead space behind the rear glove box. If resetting it doesn't help, try jumping the connector to bypass it. They can go bad.

        Only two things are infinite, the universe and human stupidity, and I'm not sure about the former. -- Albert Einstein
        rides: 93 Crown Vic LX (The Red Velvet Cake), 2000 Crown Vic base model (Sandy), 2003 Expedition (the vacation beast)
        Originally posted by gadget73
        ... and it should all work like magic and unicorns and stuff.
        Originally posted by dmccaig
        Overhead, some poor bastards are flying in airplanes.

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          #5
          Yep - Inertia Switch - the name did escape me!
          What I Own: 1993 Mercury Grand Marquis GS
          What I Help Maintain: 1996 CV / 1988 CV / 1988 Tempo

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            #6
            I tried the inertia switch too,
            I’ll try jumping it out and see.
            But as for a fuse? None mentioned in the owners manual or electrical manual?


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              #7
              Originally posted by 9t3lightning View Post
              I tried the inertia switch too,
              I’ll try jumping it out and see.
              But as for a fuse? None mentioned in the owners manual or electrical manual?


              Sent from my iPhone using Tapatalk
              Not sure if SEFI is the same as CFI, but my car has a fusible link where the fuel pump relay gets constant power from the starter relay stud.
              1985 Mercury Grand Marquis LS, "Maisa"
              1995 Chevrolet Caprice Classic STW, "Sally"

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                #8
                Check for power at the fuel pump relay, its always hot without the key on. WagonMan
                89 Colony Park
                90 Colony Park
                70 HEMI Daytona Convertible

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                  #9
                  Ok
                  So i can hear the pump coming on now
                  Aftermarket pump isn’t as noisy as the factory one . But
                  Still no start.
                  Question on the pump
                  Connections, could I have put the wires on backwards and the pump not pumping correctly ?
                  I checked the shrader valve and it seeM to have some pressure .


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                    #10
                    What is "some pressure?" Perhaps you've got an ignition issue.
                    1985 LTD Crown Victoria - SOLD
                    1988 Town Car Signature - Current Party Barge

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                      #11
                      Originally posted by 9t3lightning View Post
                      Ok
                      So i can hear the pump coming on now
                      Aftermarket pump isn’t as noisy as the factory one . But
                      Still no start.
                      Question on the pump
                      Connections, could I have put the wires on backwards and the pump not pumping correctly ?
                      I checked the shrader valve and it seeM to have some pressure .


                      Sent from my iPhone using Tapatalk
                      You absolutely could wire it backwards. It won't pump fuel up to the rail. Do you have a fuel pressure gauge?

                      How old is the fuel filter?

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                        #12
                        I do have a pressure gauge will have to try that tomm
                        The pump wasn’t marked so it was a 50/50 chance
                        And it’s definitely a fuel issue since she fires right up on starting fluid


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                          #13
                          I had a fuel issue too, so replaced the following in order:
                          1. Fuel filter (under pax rear well);
                          2. Fuel regulator (a total arse to get to!);
                          3. Fuel pump.
                          The pump was actually okay, turned out that little hose from the pump to the rail that had split in a few places.
                          "You can lead a horse to water, but a pencil must be lead"
                          Stan Laurel (1890-1965)

                          Penelope - 1952 International L200
                          Jean - 1987 Mercury Grand Marquis Colony Park GS
                          Lucy - 2003 Lincoln Town Car Signature

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                            #14
                            Ok so changed the filter just
                            To make sure and have 38 for fuel pressure at the schrader valve.
                            And all she does is crank
                            But if I squirt starting fluid in the throttle body she fires right up
                            Wtf


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                              #15
                              Sounds like the fuel injectors may not be opening. Don't believe a '90 Wagon has a crankshaft or camshaft sensor so the injectors may not be getting power from the PCM. I would check for power at the injector connectors and take it from there. I'm sure someone will correct me if I am way off base.
                              What I Own: 1993 Mercury Grand Marquis GS
                              What I Help Maintain: 1996 CV / 1988 CV / 1988 Tempo

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