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Quota 1000 Fuel Pump

Discussion in 'Quota & TT' started by DavidN, May 14, 2019.

  1. DavidN

    DavidN Just got it firing!

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    Hey there!

    New to the forum and new to the guzzi world.

    Got myself a '91 Quota 1000. I bought it knowing that it had some running issues but I decided to bite the bullet anyway. This bike is to good looking and rare to be ignored.
    First of all, is it normal for the fuel pump to run continuously? I guess it would stop once it got to a certain pressure.
    I´ve balanced the throttle body and check the TPS... everything seems nice. However after riding a bit I have a very hard time to restart the engine. I will crank and crank but just won't fire up. If I let it cool down it will start again pretty easily.

    Any thoughts on this guys?

    Cheers from Portugal.
     
  2. john zibell

    john zibell Moderator Staff Member GT Famiglia

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    When you turn the key on, it should only run for a few seconds and stop. Once stops then try to start. Considering the age of the fuel pump, it may need replacement.
     
  3. DavidN

    DavidN Just got it firing!

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    Thanks for your reply. I thought so as well. But since this is a very rudimentary EFI system I had my doubts.
     
  4. john zibell

    john zibell Moderator Staff Member GT Famiglia

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    Duration of the fuel pump running is controlled by the ECU. There may be an issue with the programming. Or the fuel pump relay may be stuck closed making it run continuously. Let's hope it is the relay.
     
  5. DavidN

    DavidN Just got it firing!

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    Thanks John. I'll check the relay. I wonder if the fuel pressure sensor is built in the pump or if it's external...
     
  6. V700Steve

    V700Steve High Miler GT Contributor

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    There is no pressure sensor, it is timed by the ecu. There is a pressure regulator in the system to keep fuel at a steady 3bar in hoses to injectors. It is mechanical not electronic. It is in line on the 1000cc and on the return tap to tank on the 1100cc.
     
    Last edited: May 16, 2019
  7. DavidN

    DavidN Just got it firing!

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    Thanks Steve. I'm aware of that regulator. If memory serves me right, it has one fuel inlet supplied from the filter, one vacuum connection to the intake manifold, one outlet to the injectors and one outlet bypass to the tank.
    But I'm missing something. If it is only timed, how can the that pressure (3bar) be maintained? I guess there would be a pressure drop sooner or later... Hummm

    BTW... since my pump works continuously, there is a constant stream of fuel flowing back into the tank. This obviously can't be right.


    Thanks for the feedback guys!
     
  8. john zibell

    john zibell Moderator Staff Member GT Famiglia

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    David,

    The ECU runs the fuel pump for a few seconds to pressurize the system then shuts off. On a correctly functioning bike that is your indicator to start the engine. Once the engine is running, the ECU keeps the fuel pump running. Besides it being a stuck relay, someone may have bypassed that relay in the past to keep the pump running.
     
    V700Steve likes this.
  9. DavidN

    DavidN Just got it firing!

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    OK. That finally makes sense to me. Wouldn't be surprised if it had been bypassed... The bike has clear signs of being mistreated.
    I'll keep you guys posted.
    Cheers! Have a good one!
     

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