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Dead fuel pump or dead fuel pump relay. Which? 140-160 1973

posted by  someone claiming to be Dick on  Wed Aug 25 02:21 CST 2004 [RELATED]

I have a 1973 145 wagon with the D-jetronic fuel system on it. It's been stored in my mother-in-law's garage for over three years. Not too long ago I went to start it, but did not get the customary 1-2 second hum from the back fuel pump, telling me the fuel injection system had been pressurized. Of course it did not start. Before I tear into the fuel pump (which is covered in thick underbody coating making it hell to remove), is there a way I can tell from the fuel pump relay on the inside fender well, whether the fuel pump is okay and not the relay? I know there is also a plus/negative factor to be aware of in testing the fuel pump. Can anyone help me here, and also which relay (and the flat pin contacts) on the inside fender well is the fuel pump relay? There are two that look exactly the same. Dick








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    Dead fuel pump or dead fuel pump relay. Which? 140-160 1973

    posted by  walrus3 on  Wed Aug 25 05:01 CST 2004
    Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed     [IGNORE ALL POSTS]
    last visit: Mon Dec 2 14:20 CST 2013
    [RELATED]

    In my 73 145E the fuel pump was completely gummed up with bad gas (which
    after I drained it, managed to gum up another car's complete fuel system
    also. If the fuel pump won't run when you are sure you have power to it,
    you CAN take it apart and clean it, although you may find other problems.
    I'd recommend getting rid of whatever gas and fuel filters are in the car,
    for a start. Old gas is bad stuff!

    BTW the O-rings in the fuel pump are 1 5/16" x 1/16".
    --
    George Downs, Bartlesville, Oklahoma, Central US








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    Dead fuel pump or dead fuel pump relay. Which? 140-160 1973

    posted by  greenteagod on  Wed Aug 25 02:57 CST 2004
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    last visit: Tue Oct 14 17:16 CST 2008
    [RELATED]

    Start Here. Also I believe I have a fuel pump relay hanging around as well as a fuel pump if you figure out your problem. Just let me know and I'm sure something could be worked out. I'll be sure to get the rest of that manual posted someday =)
    --







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      Dead fuel pump or dead fuel pump relay. Which? 140-160 1973

      uid 4846's pic
      posted by  JohnMc on  Wed Aug 25 03:11 CST 2004
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      last visit: Thu Oct 23 07:42 CST 2014
      [RELATED]

      First turn the key on, leave it on. Then carefully listen as you press the accellerator down. Do you hear the injectors firing? That means the FI system is powered up. If you don't it means it isn't, and there's no point in fiddling with the pump relay if the FI system isn't even trying to turn it on.

      Perhaps because it is an added on feature, perhaps because they needed the cleanest power source possible, but the power supply for the FI system comes directly off the battery. A big battery cable and a little green wire on the + terminal. I had the green little wire break once, and spent a while trying to figure out why the fuel pump wasn't working before I noticed that the FI system in general wasn't alive.
      --
      I'm JohnMc, and I approved this message.








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        Dead fuel pump or dead fuel pump relay. Which? 140-160 1973

        posted by  someone claiming to be Dick on  Wed Aug 25 21:48 CST 2004 [RELATED]

        To everyone who replied to my post--thank you ever so much for your advice. No, I didn't check the fuses, but I replaced them once many years ago with the non-corroding type, but the next time I'm at my mother-in-law's, I will take another look and rotate them in case there is some corrosion. I didn't know about pressing the accelerator and listening for the clicking noise of the injectors opening. Will check that as well. Again, my thanks. Dick








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          Dead fuel pump or dead fuel pump relay. Which? 140-160 1973

          uid 5098's pic
          posted by  Sil on  Thu Aug 26 14:17 CST 2004
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          last visit: Fri Oct 24 07:24 CST 2014
          [RELATED]

          Actually, I was referring to the separate fuel pump fuse that lives in the little box on the left inner front fender, just ahead of the three relays, at least on my car. But then again, maybe the 73s were set up differently.
          Bob S.







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