RentAGuzzi Motorcycle Rentals & Tours – Los Angeles CA
  1. Ciao Guest, ALERT FOR Store purchases - riding season is here, so we are in the crazy times for orders. Lead times are long, so we can't do much to rush things. Always best to buy off Season when things are in stock. Also, there are many seasonal holidays this time of year, both here and in Europe (mainly August), so please be patient! We aren't Amazon. We do our best to get things out as quickly as possible, and also, we aren't in control of things like customs & weather delays, etc. Please note GuzziTech is largely a ONE man operation. Requests for phone calls will be deleted. We are online only. Orders are currently being shipped once or twice a week. You can always sign into the online Store system to check the status. Please refrain if at all possible about emailing for an update; If you must ask for order info, please reply on the actual order email. You will get shipping info when it goes out via our online Store system (check your Spam folder), and if you want to cancel your order, please notify us direct email (do not post or use the Forum) and allow 7-10 business days for a reply BEFORE OR JUST disputing the charge. We don't want your money if we can't deliver. Special order items are subject to a 15-20% cancellation fee. Thanks for your understanding and support.
  2. Ciao Guest - You’ve landed at the ultimate Guzzi site. In SoCal? See the Service tab above for the best in service, tires, tuning and installation of our products or custom work. NEW REGISTRATIONS REQUIRE EMAIL ACTIVATION - CHECK YOUR SPAM FOLDER. ALWAYS TRY A SEARCH BEFORE STARTING A NEW TOPIC - AND PLEASE DON'T BE A DRIVE-BY POSTER: Most questions you may have are well answered on the Forum; Be sure to try a search and/or post on the Forum before starting a new topic, and as a common courtesy, check back if you are posting elsewhere on the web. If you are posting on numerous sites on the web, please stop back and follow up. There is zero tolerance on personal attacks and off-site links to other Forums or competing products. Note there's decades of Guzzi hands-on experienced help on this site, all whom give endless amounts of their time for free - be courteous. Be sure to click on the Store link also above for our 600+ product inventory, including many of our 100% Made-in-house-USA GT products and engine kits. We are still mostly a one man operation (not Amazon), so thanks in advance for your patience on orders. PLEASE refrain from emailing about your order Status, as you will get an email with tracking info when your order goes out; Email inquiries on orders slows everything down. We cannot answer questions direct unless it’s about something on the Store or that you have purchased from us. We do NOT have a phone number - We are online only - Do not email and tell us to call you. You will find us highly responsive via email on the Contact page with any questions on our products (only). We appreciate the consideration, understanding and your business... past and future. Also be sure to see our custom builds at GTMotoCycles.com or click the Service tab above.

Quota 1000 Fuel Pump

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

  1. DavidN

    DavidN Just got it firing!

    Joined:
    May 14, 2019
    Messages:
    6
    Likes Received:
    0
    Location:
    Portugal
    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

    Joined:
    Oct 28, 2008
    Messages:
    7,416
    Likes Received:
    587
    Location:
    Huntsville, AL
    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!

    Joined:
    May 14, 2019
    Messages:
    6
    Likes Received:
    0
    Location:
    Portugal
    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

    Joined:
    Oct 28, 2008
    Messages:
    7,416
    Likes Received:
    587
    Location:
    Huntsville, AL
    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!

    Joined:
    May 14, 2019
    Messages:
    6
    Likes Received:
    0
    Location:
    Portugal
    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

    Joined:
    Dec 8, 2008
    Messages:
    602
    Likes Received:
    200
    Location:
    Atlanta area, GA
    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!

    Joined:
    May 14, 2019
    Messages:
    6
    Likes Received:
    0
    Location:
    Portugal
    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

    Joined:
    Oct 28, 2008
    Messages:
    7,416
    Likes Received:
    587
    Location:
    Huntsville, AL
    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!

    Joined:
    May 14, 2019
    Messages:
    6
    Likes Received:
    0
    Location:
    Portugal
    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!
     
  10. DavidN

    DavidN Just got it firing!

    Joined:
    May 14, 2019
    Messages:
    6
    Likes Received:
    0
    Location:
    Portugal
    Hi!

    So yesterday I finally had some time to get my hands on the Quota.
    The relays seem to be working properly. Even interchanged the injection solenoid with the pump solenoid and nothing changed. I traced the pump wiring back to the ECU and everything seemed ok. The pump, on the other hand, seems to have been replaced. So, long story short, the pump runs continuously as soon as I flip the switch to RUN. So I guess it might be ECU related, as John Zibell pointed out.
    But my pursuit for Gremlins didn't stop there. The horns work, but somehow someone bypassed the horn relay. I didn't think much of this so I plowed ahead.
    I tested the engine head temperature NTC. It was ok.
    Then I spotted the air sensor mounted underneath the left horn. It was clearly damaged... half of it was missing. How much can a non existing air temperature sensor affect the poor performance and the hard start when hot??
    It's exactly the same model as the engine temperature sensor, so I'm going to order one right after I post this.

    Cheers!
     
  11. john zibell

    john zibell Moderator Staff Member GT Famiglia

    Joined:
    Oct 28, 2008
    Messages:
    7,416
    Likes Received:
    587
    Location:
    Huntsville, AL
    A damaged air temperature sensor will impact starting and running. It is part of the calculation for air density. It seems engine temperature has more effect on running, but the air temperature part of the equation is needed as well.
     

Share This Page