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More Fuel Pump Questions 200 1990

posted by  someone claiming to be Toddlie on  Tue Jan 28 14:41 CST 2003 [RELATED]

I posted a few days ago regarding the in tank pump not working, while the main pump was making an electric razor type noise. I just put an amp-meter on the fuse block of the pre-prump (in tank) and the main pump (relay) and both showed up as 00.0 on my multimeter. I am sure it was on the amperage test. But both had abosultely no amperage. Is this possible and the car still be running?








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    More Fuel Pump Questions 200 1990

    posted by  DougC on  Wed Jan 29 02:57 CST 2003
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    last visit: Sun Aug 10 08:30 CST 2014
    [RELATED]

    I used the 10 amp maximum setting on my multi-meter to test both pumps on my 81. I hooked the leads to the two contacts where the main pump fuse goes. The main pump never registered any amps at all with the car running. What had happened is the main pump instantly blew the internal fuse of the multimeter. Eventually, I determined that the main pump was drawing over 10 amps because it blew the 10 amp fuse and the transfer pump was only drawing somewhere between .4 amps and 1 amp. I never determined what it all really means, other than that I need to get a real ammeter like one guy suggested. Any suggestions on where to buy a good meter and what brand?
    --
    Thanks to everyone for the help, Doug C. 81 242 Brick Off Blocks, stock; 86 240, 129K








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      More Fuel Pump Questions 200 1990

      posted by  someone claiming to be Toddlie on  Wed Jan 29 21:17 CST 2003 [RELATED]

      Doug,

      That is exactly what was happening to me. I have been searching for a few days for a decent "multimeter". I came across what seemed to be decent. It is not great. It is not a "Fluke". But, it should do the trick. I will let you know how it turns out.








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    More Fuel Pump Questions 200 1990

    posted by  Bob Wennerstrom on  Wed Jan 29 02:00 CST 2003
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    last visit: Fri Jul 15 12:01 CST 2011
    [RELATED]

    You realize that to take an amperage reading, you have to break the hot lead and run it though the meter, right?

    Bob
    10 Volvos ('62-91) and counting








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      More Fuel Pump Questions 200 1990

      posted by  someone claiming to be Toddlie on  Wed Jan 29 21:19 CST 2003 [RELATED]

      Bob,

      Thanks for the resonse. I was trying to "save money" with a less than par multimeter. I just bought a decent one. I was blowing the internal fuse everytime I was touching any part of the car. Thanks for the help. I am a slow learner it seems :-)








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    More Fuel Pump Questions 200 1990

    posted by  oty on  Tue Jan 28 17:29 CST 2003
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    The car will run without the prepump, at least to some degree or another depending on the circumstances. However, the vehicle needs the main pump to supply fuel to the injectors under a specified limit. Otherwise a correct spray pattern will not be achieved. The main pump will have a specific amp draw if it is working.








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    More Fuel Pump Questions 200 1990

    posted by  haroon on  Tue Jan 28 15:36 CST 2003
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    last visit: Thu Feb 20 11:25 CST 2014
    [RELATED]

    If you open the gas cap, you can hear the pre pump with the car running. The car will still run when the pre pump goes out.







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