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Webers-need fuel pressure regulator?

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MR930 Wolfsburg Wizard

666 posts · joined Aug 2002 ·

#1043723
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?

grumble Son of Jim - Creator of Good

2,672 posts · joined Jun 2008 ·

#1043724
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.

barls Administrator Causer of Chaos and Mayhem

9,473 posts · joined Jun 2004 ·

#1043725
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.
“We all pay for life with death, so everything in between should be free.” Bill Hicks
the chaos project - click me

Bizarre Moderator The artist formerly known as blue74l

12,787 posts · joined Aug 2002 ·

#1043727
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
Futue te ipsum!!!

MR930 Wolfsburg Wizard

666 posts · joined Aug 2002 ·

#1043728
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.

Bizarre Moderator The artist formerly known as blue74l

12,787 posts · joined Aug 2002 ·

#1043729
What sieve motor.? Cam?

I have never seen 44
Futue te ipsum!!!

hellbugged 48's and straight cuts

5,080 posts · joined Apr 2003 ·

#1043734
Poor sync?



Blocked idle jets?

Blocked airs?

HS618 Officially Full-On Dubber

277 posts · joined Mar 2005 ·

#1043741
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.

vassy66T1 Wow ... are U reading this?

2,120 posts · joined Jun 2003 ·

#1043743
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

MR930 Wolfsburg Wizard

666 posts · joined Aug 2002 ·

#1043750
Seems it was just linkages not adjusted right. I trusted my son had done it right.