Results 1 to 5 of 5

Thread: Fuel Problem

  1. 05-30-2019, 10:57 AM #1
    alberta
    alberta is offline
    Member
    Join Date
    Jan 2018
    Posts
    83

    Fuel Problem

    I took my 911T out for a drive yesterday as rebuilt carbs were done over the winter. After the car sat for about 45mins I opened
    the rear hood to see if all was ok.I installed a clear fuel filter before the carbs as they were just rebuilt.I noticed that it appeared as fuel was coming back from the carbs into the clear filter and it looked like the fuel was boiling.The car ran fine but I'm not sure if this fuel boiling appearance is of concern. Day was about 25C and the car ran between 180 to 200 degrees, and I'm running Webers.
    Any thoughts to this problem would be appreciated.
    Thanks John
    Reply With Quote Reply With Quote
  2. 05-31-2019, 05:00 AM #2
    fizeus
    fizeus is offline
    Senior Member
    Join Date
    Mar 2016
    Location
    Italy
    Posts
    103
    Did you replaced ALL the insulators?
    Not sure about your engine setting/configuration/tuning but you should avoid boiling fuel because this can lead to bigger problems (not just vapour lock)....

    You probably left the car sitting for too long at idle (low air flow)
    Reply With Quote Reply With Quote
  3. 05-31-2019, 06:41 AM #3
    alberta
    alberta is offline
    Member
    Join Date
    Jan 2018
    Posts
    83
    I did not take off the intake manifolds. So not sure if it has insulators. Are these visible when you look at the intake manifolds or do you have to take the intake manifolds off to see if you have insulators.
    Reply With Quote Reply With Quote
  4. 05-31-2019, 11:27 AM #4
    fizeus
    fizeus is offline
    Senior Member
    Join Date
    Mar 2016
    Location
    Italy
    Posts
    103
    Quote Originally Posted by alberta View Post
    I did not take off the intake manifolds. So not sure if it has insulators. Are these visible when you look at the intake manifolds or do you have to take the intake manifolds off to see if you have insulators.
    Insulators are between cylinders and intakes so if you didn't removed the manifolds they should be still in place.
    You should see something like a gasket 2mm tall.
    Generally they needs replacing because they cracks with hot/cold cycles.
    If they are still here I would take the car for a ride to see if the problem persists and to check normal operating (whils driving) temperatures.

    Many times ago it was a good practice before shutting down to rev the engine at 4k rpm and turn off the key to drain some fuel from the carburators.
    Reply With Quote Reply With Quote
  5. 05-31-2019, 07:19 PM #5
    62S-R-S
    62S-R-S is offline
    Senior Member 62S-R-S's Avatar
    Join Date
    Nov 2009
    Location
    Cecil pa
    Posts
    864
    Quote Originally Posted by alberta View Post
    I installed a clear fuel filter before the carbs as they were just rebuilt.I noticed that it appeared as fuel was coming back from the carbs into the clear filter and it looked like the fuel was boiling.
    Routing additional length fuel line and a bracket to house the filter at a better spot to one side of the car, should solve it.
    Reply With Quote Reply With Quote
« Previous Thread | Next Thread »

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  

Forum Rules


Message Board Disclaimer and Terms of Use
This is a public forum. Messages posted here can be viewed by the public. The Early 911S Registry is not responsible for messages posted in its online forums, and any message will express the views of the author and not the Early 911S Registry. Use of online forums shall constitute the agreement of the user not to post anything of religious or political content, false and defamatory, inaccurate, abusive, vulgar, hateful, harassing, obscene, profane, sexually oriented, threatening, invasive of a person's privacy, or otherwise to violate the law and the further agreement of the user to be solely responsible for and hold the Early 911S Registry harmless in the event of any claim based on their message. Any viewer who finds a message objectionable should contact us immediately by email. The Early 911S Registry has the ability to remove objectionable messages and we will make every effort to do so, within a reasonable time frame, if we determine that removal is necessary.