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Baja Forums -:- VW Volkswagen Bug, Baja, Bus, Sandrail and Thing -:- VW Volkswagen & Baja Bug General Discussion -:- Having problems with weber dual carbs
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Having problems with weber dual carbs
Bug, Baja, Thing and Buggies. Most every thing that will not fit any any other area. See list of other Forums for better topic placement...Volkswagen General Discussion
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trigger
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Joined: Oct 08, 2006
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Location: Rock Springs wyoming
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Post Post subject: Having problems with weber dual carbs
Posted: Tue Jul 17, 2007 03:36 AM
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wondering if I need to upgrade my fuel pump

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milleraj119
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Post Post subject: Re: Having problems with weber dual carbs
Posted: Tue Jul 17, 2007 03:56 AM
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discuss what the problems are

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Post Post subject: Re: Having problems with weber dual carbs
Posted: Tue Jul 17, 2007 05:21 PM
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AT AN IDLE THEY RUN GREAT BUT WHEN YOU REV THE ENGINE THEY CUT OUT.


Last edited by trigger on Tue Jul 17, 2007 07:49 PM; edited 1 times in total
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Post Post subject: Re: Having problems with weber dual carbs
Posted: Tue Jul 17, 2007 06:28 PM
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not enough fuel????just enough for idle???


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Post Post subject: Re: Having problems with weber dual carbs
Posted: Tue Jul 17, 2007 07:50 PM
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what fuel pump you have now? how much pressure?


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Post Post subject: Re: Having problems with weber dual carbs
Posted: Tue Jul 17, 2007 07:51 PM
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THANKS FOR THE INFO BUT AFTER MORE FUEL STILL CUTTING OUT. GOING TO TRY REJETTING THE CARBS.

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Post Post subject: Re: Having problems with weber dual carbs
Posted: Tue Jul 17, 2007 07:52 PM
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VIN70 wrote:
what fuel pump you have now? how much pressure?
IT IS RUNNING AT 7-10 PSI

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Mykul
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Post Post subject: Re: Having problems with weber dual carbs
Posted: Tue Jul 17, 2007 09:01 PM
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Shocked That's a lot!

What carbs and engine?

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Post Post subject: Re: Having problems with weber dual carbs
Posted: Tue Jul 17, 2007 11:24 PM
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THIS IS WHAT THE NEW PUMP IS PUTTING OUT, THE OLD ONE WAS 3TO5 PSI. THE CARBS ARE WEBER 44 IDF 2 BBLS AND THE ENGINE IS ABOUT A 1750cc

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Post Post subject: Re: Having problems with weber dual carbs
Posted: Wed Jul 18, 2007 05:09 PM
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what size fuel line to the pump. just bacuse you psi. you still might not have the flow the carbs need. try changing over to 3/8 Very Happy Very Happy

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Post Post subject: Re: Having problems with weber dual carbs
Posted: Wed Jul 18, 2007 08:15 PM
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I ve changed the fuel lines still no improvement. also back the fuel pump down to 5 psi thought i was over fueling.

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T_Town_Baja
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Post Post subject: Re: Having problems with weber dual carbs
Posted: Wed Jul 18, 2007 09:58 PM
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Pretty sure WEBER's like to run at 2-3psi, anything over that is too much.

I am running a single WEBER 40 IDF on my 1835 and it runs like a raped ape, wouldn't mind duals though.

What main jets are you running? Accelerator pump is functioning correctly?

Blaine

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Post Post subject: Re: Having problems with weber dual carbs
Posted: Thu Jul 19, 2007 08:25 AM
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Have you checked to make sure your jets just aren't clogged?

What exactly is it doing? running rough when you rev it or just trying to die?

More specifics would help to diagnos it.

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Post Post subject: Re: Having problems with weber dual carbs
Posted: Thu Jul 19, 2007 06:15 PM
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WHEN YOU REV THE ENGINE IT IS RUNNING ROUGH AND BACK FIRING OUT OF ONE CYLINDER, THEINKING IT MAYBE OVERLOADING WITH FUEL. AND I HAVE CHECKED THE JETS ON BOTH.

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Post Post subject: Re: Having problems with weber dual carbs
Posted: Thu Jul 19, 2007 10:15 PM
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Did this just start on its own, or have you introduced something new to the motor/ done any new work?


Have you synchronized the dual carbs? Seems to me if only one side is running poorly, it may be that specific carb. If you can narrow it to a specific cylinder, perhaps you have a jetting problem on the barrel of the carb.

Also, you said you run about 5psi, I am almost positive Weber 2bbl only like 2-3psi. Could still be too much pressure for the carbs.


Blaine

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