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Thread: Lack of Vacuum and Carb issues

  1. #1

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    Lack of Vacuum and Carb issues

    Last week my truck came back after getting the brakes redone by my mechanic. They ran diagnostics and found that I have a lack of vacuum, my carbs are out of sync, and the engine diesels hard on shutdown. What can I do to fix this?

  2. #2



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    get a carb synchronizer gauge - you put in on the inlet to each barrel of the carbs and adjust the flow until they are drawing the same. I suspect your rear carb is drawing far less that the front carb and is causing all the problems. #4 cylinder is where the weber / mikunl intake pulls vacuum from, so check and be sure you have good flow.
    Pennyman1
    The best Dodge that Dodge never made
    Living the D-50 lifestyle since 1980

  3. #3


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    What pennyman1 said, there are many videos out there
    https://youtu.be/GaTRyHxvneY

  4. #4

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    Thank you for the info, I've looked into getting an airflow tool and have watched a few how to's on the subject. Could this also be the cause of my dieseling issue? Or could I be running too high fuel pressure? (Holley Red electric fuel pump reg'd down to around 5psi)

  5. #5



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    that is too high for the carbs - 3 - 3.5 PSI. Remember, flow is more important to webers / mikunis than pressure, but too much pressure will cause issues.
    Pennyman1
    The best Dodge that Dodge never made
    Living the D-50 lifestyle since 1980

  6. #6

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    Thanks, I'll reg that down next time I work on the truck.

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