no vacuum
no vacuum
My dyna wasn't idling like I had hoped so I thought I would pull it apart and see if there was something wrong. I put a rebuild kit in it and reinstalled it and know it won't pull any gas. Ive checked all the obvious things and am baffled. It was fine before I pulled it off. Any help?
Extreme HDF Member
Joined: Jun 2014
Posts: 11,448
Likes: 2,299
From: NW Ohio
Need more details, bud.
We talking about a carburetor here?
What all was removed and/or reworked?
We going as far as piston rings and valves here? Intake? Spark plugs? Throttle body, injectors, carb body, etc...
If carb...which one?
Petcock style?
No vacuum at intake ports? At throttle plate?
No vacuum or just no fuel?
We talking about a carburetor here?
What all was removed and/or reworked?
We going as far as piston rings and valves here? Intake? Spark plugs? Throttle body, injectors, carb body, etc...
If carb...which one?
Petcock style?
No vacuum at intake ports? At throttle plate?
No vacuum or just no fuel?
Last edited by cggorman; Feb 9, 2020 at 03:34 PM.
Yes the carburetor. Just took off the original carberator and put in a rebuild kit. Reset idle mixture new float and such. Just installed a rebuild kit reinstalled the carb , turned it over. No gas to the carb. checked the vacuum from the tank.
Seasoned HDF Member
Joined: Mar 2010
Posts: 38,537
Likes: 6,412
From: Honah Lee
You need gas to the carb. Turn the little gizmo on the petcock 90 degree. If the petcock has a vacuum hose attached to it, be sure it is hooked up and good shape. Do not remove it. If necessary repair vacuum diaphragm. It is a safety device.
Last edited by Jackie Paper; Feb 9, 2020 at 03:46 PM.
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Extreme HDF Member
Joined: Jun 2014
Posts: 11,448
Likes: 2,299
From: NW Ohio
So a Keihin carb and vacuum petcock?
You reattached the vacuum line from the carb body to the petcock and plugged the others? Correct port attached?
I have near-zero experience with that setup as I hate those parts...for this kind of reason...
Will the engine run for a minute with just fuel in the bowl or stater fluid? I don't know if that petcock has a vacuum override setting (reserve maybe?)...you may need to prime the fuel line from the tank and the fuel bowl on the carb so it can run long enough to pull a vacuum sufficient to open the petcock.
You reattached the vacuum line from the carb body to the petcock and plugged the others? Correct port attached?
I have near-zero experience with that setup as I hate those parts...for this kind of reason...
Will the engine run for a minute with just fuel in the bowl or stater fluid? I don't know if that petcock has a vacuum override setting (reserve maybe?)...you may need to prime the fuel line from the tank and the fuel bowl on the carb so it can run long enough to pull a vacuum sufficient to open the petcock.
Last edited by cggorman; Feb 9, 2020 at 03:49 PM.
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HDF Community Team
Joined: Apr 2018
Posts: 2,574
Likes: 1,068
From: Ohio
Also, those vacuum petcocks are real pieces of you know what. Get a manual one.