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poor mpg+air in fuel line

  • 01-07-2009 9:25pm
    #1
    deaglan169
    Registered Users, Registered Users 2 Posts: 1,045 ✭✭✭


    hi ive been gettin worse and worse mpg from my car over the past few weeks i noticed that there is a constant stream of air bubbles in the fuel line from the fuel filter into engine and i presume this is the problem if not part of it, do i just need to bleed the fuel lines or do i have a corroded line somewere


Comments

  • #2
    crosstownk
    Registered Users, Registered Users 2 Posts: 12,863 ✭✭✭✭crosstownk


    What make/model/year is your car??

    Those bubbles could be quite normal.
    Untitled Image




  • #3
    deaglan169
    Registered Users, Registered Users 2 Posts: 1,045 ✭✭✭deaglan169


    crosstownk wrote: »
    What make/model/year is your car??

    Those bubbles could be quite normal.

    01 seat leon sdi


  • #4
    crosstownk
    Registered Users, Registered Users 2 Posts: 12,863 ✭✭✭✭crosstownk


    I doubt that your recent poor fuel consumption is directly related to the bubbles. It is most likely another reason.
    Untitled Image




  • #5
    alo1587
    Registered Users, Registered Users 2 Posts: 462 ✭✭alo1587


    A few bubbles would be normal enough in a diesel,check for a blocked/dirty air filter.


  • #6
    gyppo
    Registered Users, Registered Users 2 Posts: 1,648 ✭✭✭gyppo


    As the rest said, a few bubbles in the fuel line is often normal.

    Also, if you think about it, the more bubbles you have in the fuel line, the less fuel you are using!:D

    OP, is the car hard to start in the morning? If it is, and you have bubbles, then you have an airleak in the fuel system, and fuel from the filter will drain back to the tank overnight. Check the fittings on your fuel filter as a starting point.


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  • #7
    deaglan169
    Registered Users, Registered Users 2 Posts: 1,045 ✭✭✭deaglan169


    fuel filter is only a few months old i have checked all the fittings on the filter and they seem secure, and the car starts no problem in the morning and is running well but just really bad mpg as of late


  • #8
    DannyBuoy
    Registered Users, Registered Users 2 Posts: 598 ✭✭✭DannyBuoy


    If its a sudden drop in mpg it maybe a leak somewhere..

    Any other symptoms such as smoky exhaust, different noise from engine?


  • #9
    alo1587
    Registered Users, Registered Users 2 Posts: 462 ✭✭alo1587


    deaglan169 wrote: »
    fuel filter is only a few months old i have checked all the fittings on the filter and they seem secure, and the car starts no problem in the morning and is running well but just really bad mpg as of late

    Open up the filter box and have a look at the bottom of the air filter.Is it black looking and clogged with leaves/debris? Is there an excessive amount of black smoke coming from the exhaust when you accelerate? Are there any signs of leaks on your driveway?


  • #10
    deaglan169
    Registered Users, Registered Users 2 Posts: 1,045 ✭✭✭deaglan169


    checked air filter some debris but nothing major small bits of leaves flies etc... no black smoke or fuel leaks as far as i can see im really stumped as to what is causing this


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