Skip to content
View in the app

A better way to browse. Learn more.
Ford Owners Club - Ford Forums

A full-screen app on your home screen with push notifications, badges and more.

To install this app on iOS and iPadOS
  1. Tap the Share icon in Safari
  2. Scroll the menu and tap Add to Home Screen.
  3. Tap Add in the top-right corner.
To install this app on Android
  1. Tap the 3-dot menu (⋮) in the top-right corner of the browser.
  2. Tap Add to Home screen or Install app.
  3. Confirm by tapping Install.



Join the Independent Ford Owners' Club

Our community has been built by enthusiasts, for enthusiasts, and proudly run by Ford owners' for over 18 years. As an independent, non-official club, everything you’ll find here, advice, support, and opinions, comes directly from members with genuine Ford ownership experience.

Join our friendly community... it's Free!

 

Air bubbles in fuel line

Pietr8
Pietr8
in Ford Fiesta Club

Featured Replies

Hi all,

When doing a service on my 2007 MK6.5 Fiesta, I noticed some air bubbles in one of the fuel lines. I think they're in the fuel line going towards the high pressure pump. Please see the first attached picture where I've highlighted the bubbles. Obviously the bubbles move through the line when I press the priming bulb, but new bubbles seem to be coming in again. Does anyone know if it is normal for these bubbles to be there?

Cheers!
Pietr

 

IMG_20160913_204231705_HDR.jpg

IMG_20160913_204239423.jpg

  • Quote


    34 minutes ago, Pietr8 said:

    Hi all,

    When doing a service on my 2007 MK6.5 Fiesta, I noticed some air bubbles in one of the fuel lines. I think they're in the fuel line going towards the high pressure pump. Please see the first attached picture where I've highlighted the bubbles. Obviously the bubbles move through the line when I press the priming bulb, but new bubbles seem to be coming in again. Does anyone know if it is normal for these bubbles to be there?

    Cheers!
    Pietr

     

    IMG_20160913_204231705_HDR.jpg

    IMG_20160913_204239423.jpg

    The fuel lines will degrade over time, I would check the connections to the fuel filter on the right side of the engine - sometimes the connectors don't fully seal. The diesel is under no pressure in those lines as it just circulates around to the high pressure pump on the left. Are the bubbles constant or just a few every now and then?

  • Quote

    a few will be normal

  • Quote
    • Author

    I checked the connections to the fuel filter and they seem OK. I also took a look at the fuel line while the engine was running and the bubbles seem to disappear, so I suppose it is normal to see some air bubbles in this line when the engine is off. Thanks for the replies!

  • Quote
    5 hours ago, Pietr8 said:

    I checked the connections to the fuel filter and they seem OK. I also took a look at the fuel line while the engine was running and the bubbles seem to disappear, so I suppose it is normal to see some air bubbles in this line when the engine is off. Thanks for the replies!

    Just keep an eye on it from time to time, a few bubbles are fine, its more of an issue when you have a stream of small bubbles in the line, sometimes the connections don't seal perfectly.

  • Quote

    • Latest Deals

    Ford UK Shop for genuine Ford parts & accessories

    Disclaimer: As the club is an eBay Partner, The club may be compensated if you make a purchase via the club

    Join the conversation

    You can post now and register later. If you have an account, sign in now to post with your account.
    Note: Your post will require moderator approval before it will be visible.

    Guest
    Reply to this topic...
    Go to topic listing

    The "Digestive"

    • The Digestive Forum Roundup (31st May - 7th June 2026)

      Steve ·
      The Digestive Forum Roundup (31st May - 7th June 2026) We hope you’re all enjoying your week and finding time for some time enjoying your Ford! This week, our vibrant forum has been buzzing with discussions that touch on a diverse range of Ford models, from the Mondeo to the Fiesta and Focus. Here’s a recap of some key conversations that might pique your interest. Starting with the Mondeo, user Frenchspanner shared a particularly frustrating issue relating to a 'Immobiliser Active' message appea
      Steve
      Steve
      • 128 views





    Background Picker
    Customize Layout

    Account

    Navigation

    Search

    Search

    Configure browser push notifications
    Chrome (Android)
    1. Tap the lock icon next to the address bar.
    2. Tap Permissions → Notifications.
    3. Adjust your preference.
    Chrome (Desktop)
    1. Click the padlock icon in the address bar.
    2. Select Site settings.
    3. Find Notifications and adjust your preference.