Weber DGV float setting

The other method you can use

But i will caveat this with its a method i use on DCOEs and IDFs not DGV. I didn't know if it would work on DGV
but looking at the diagrams in the attachment above i can't see why its application here would not be valid.

operation is similar, fuel should be below the exit into main venturi from main well when engine off, by enough to stop undue variation in operation when its running as you brake or take a fast corner.
but not too much. the symptoms in driving terms are the same...you experience the impact of over lean or over rich as rough or dead spot...but in carburation terms different.


take out main emulsion tube
use a small hooked scribe to gently probe down the wall on the primary carb venturi side to find the exit hole into the main venturi.
measure the distance from the top of the emulsion tube bore to the bottom of the hole in its side facing the main bore.

Note it down this is your critical depth.

Take a piece of translucent acrylic rod a cylinder with nice clean cut off ends, they can be opaque from the saw that ok, the rod should be of slightly smaller bore than emulsion tube well bore.
Scribe a line round it with a brake pipe cutter at this distance from the end. i.e the distance from the top of the emulsion tube bore to the bottom of the exit in its side wall

then scribe 2 more lines 1 and 2 mm above your critical depth line

you end up with an acrylic rod that has 3 lines round it 1 is the depth of the exit from the main well the next is 1 mm above that and the next is 2 mm above that
get an e clip that you can clip into your highest groove made in the rod.
You are now set to measure your critical depth +2mm below using the length of rod below the e clip

run the car at high idle low rpm to fill the bowl
shut it off
take off the carb top
take out the emulsion tube
shine your torch or IPhone torch down the emulsion tube well and insert the acrylic rod
when the acrylic rod hits the fuel down the well the top end of it will visibly change, like shadow was cast over it, the length of rod down the hole is the depth of fuel that your float setting has allowed in the bowl.
it should be 1-2 mm below the critical depth hence the 2 extra lines you scribed ideally 2.
if you don't hit fuel by the time the e clip hits the top of the well bore
float setting is too low. its shutting off the fuel through the needle valve too early in its travel.
if you hit fuel before the first line enters the well float setting is too high
if its between the 1mm and 2mm markers. e clip nearly seated id leave well alone and tune with that setting.

adjust and repeat until either happy or its time for tea....

I can not say this will work effectively as i have not done it on your carb
i have however done it many times on DCOE IDF and dellorto equivalents and have had some success

on multi carb setup like i have i use the drill bit method to set initially and then use this as a check, and i tweak the carb that is a bit out... this covers off mismatch in weight of floats and slight machining differences etc.
no reason why it can't be used as main setting routine
do it with the carb filled by the running motor but still cool.

the fuel level is set below the exit when at rest because once the main venturi flows the vacuum in the main venturi is applied to the emulsion tube well
this allows atmospheric pressure on the fuel bowl to push fuel through the main jet and the now emulsified fuel level in the well moves up to the exit and into the main venturi.

with a 2 barrel carb with staged opening there may be more than 1 emulsion tube well. id use the one on the primary.

Dave