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Author: Subject:  Webers-need fuel pressure regulator?
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posted on October 10th, 2020 at 04:24 PM
Webers-need fuel pressure regulator?


I've just put a pair of webers on my buggy and it's running horrible. It has the standard fuel pump so I didn't put in a fuel pressure regulator. Could this be my issue?
Both my other cars running webers have a regulator but are running electric pumps. It doesn't appear to be running rich. It's a new engine 1641, runs ok with the revs up but hard to take off. Ideas?
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posted on October 10th, 2020 at 06:23 PM



Barls runs a pressure regulator on his 2 litre with twin webers and i know that it ran like s...t with too much pressure, apparently they use a lower pressure but I can't remember the figure, I am sure that he wll let you know what he is running.
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posted on October 10th, 2020 at 10:08 PM



off the top of my head its 1.5 but i could be wrong. ill have look but probably won't get there before monday as I'm working tomorrow.



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posted on October 11th, 2020 at 05:27 PM



2.5 - 3.0 lbs
http://www.redlineweber.com/html/application_guide/important_things_to_know.htm 




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posted on October 11th, 2020 at 05:31 PM



I have not seen stock pumps put out greater than 3 lbs

Are they Webers or something else.

What is your jetting?
Mixtures set properly

What is it doing wrong




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posted on October 12th, 2020 at 04:53 AM



Yes 40mm idf webers. I'm going to put a pressure regulator on it. It doesn't seem to be overfueled but it's running like crap down low.
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posted on October 12th, 2020 at 07:37 AM



What sieve motor.? Cam?

I have never seen 44




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posted on October 13th, 2020 at 05:32 AM



Poor sync?



Blocked idle jets?

Blocked airs?
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posted on October 13th, 2020 at 04:57 PM



Ive been using a stock VW mechanical pump with my 48 IDA Weber street beetle for over 40 years with no regulator. If the (unlikely) pressure is too great, add a few gaskets under the mechanical pump. Depending on the size of the needle and seat (most common is 2.0mm), a fuel pressure of 2.5 lbs is adequate.
Sounds more like a tuning problem rather than fuel pressure.
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posted on October 14th, 2020 at 09:05 AM



44's on a 1641 are on the larger side. Putting in a smaller venturi (choke) will improve low end response.
Every carb works well if you rev it but it is down low and on transition that is the tuning area




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posted on October 16th, 2020 at 05:16 PM



Seems it was just linkages not adjusted right. I trusted my son had done it right.


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