Weber carb flooding - Need tips on adjustments

[chinard]

1060935

I've had my weber carb running fine for a few months now after having it swapped, but i've noticed that i'm still having problems with flooding and overflow periodicly when driving the engine hard.

I'm pretty sure its just an adjustment or two, but i'm not really sure where to start when it comes to adjusting this thing. I've seen plenty of reference for the carter BBD, but none for the weber to speak of.
[addsig]

 

[MudderChuck]

1060942

If you have disconnected or plugged the return line? You have to have a well working and clean float valve. Sometimes the filter passes grit big enough to hold the float valve open some. Could also try bending the float arm a touch (very little down) a slightly low float bowl level (1/64-1/32) helps some, especially on hills. Make sure the top gasket is whole, with no cracks or tears. The gasket gets real thin between the float bowl and the carb mouth. Plugging the overflow (if present) will also cause problems, surging and flooding on occasion.[addsig]

 

[MudDawg]

1060966

I was advised when i got mine to be sure to install a fuel pressure regulator...appearantly the float design can't cope well with fuel pressure much over 3.5 psi. I used to run a dual-jet rochester, but liked the idea of a progressive carb better. I left the bypass line hooked to the fuel filter and mounted the regulator between the filter and the carb..On filters..be sure you use one with a paper element, especially not one with nylon screen or bronze-porus material. My fuel economy improved and there is more power when i want it with the weber.

Dawg
[addsig]

 

[chinard]

1060974

Hmm.. a fuel pressure regulator you say?

It sounds like that could be the problem i am having because it IS a new weber, and it seems to flood the most when i hit the gas too hard. It could very well be a fuel pressure fix.

Who makes regulators, how much do they go for, and how easy are they to install?

Also, you mentioned that the weber was a progressive carb... What's that all about? I mean i know i installed mine because it was the most recommended, but i don't know the ins and outs of WHAT makes it better.[addsig]

 

[MudDawg]

1060977

Sorry for the confusion...if you have a 38/38 it's not progressive...both throttle plates open at the same time...i have a 32/36...the throttle controls one plate...the other opens automatically as needed under full throttle...i needed that kind on my mighty 2.5 :roll: so it wont bog....you can get a regulator in most auto supply places..in the "hot rod" section...mine is adjustable from 2 to 8 psi..hope this helps..

Dawg[addsig]

 

[chinard]

1060987

Crap!
I have no idea if i have the 38/38 or the 32/36 ... I never bothered to ask when they were installing it...

Anyways,
I'm guessing it should be easy enough to install for a complete noob like myself... :-D[addsig]

 

[jay89]

1061116

I have a weber it runs good the only problem I can't figure out is when I get on a highway or romp on it. It will bog down then kick in. It has almost gotten me rear ended. :-O [addsig]

 

[MudDawg]

1061174

Jay, is the bog just off idle??? or is it when you are going slow and put your boot in it?? Auto trans or manual?? Big tires??? how big?? gear ratio?? If it works smoothly if you allow the RPM to catch up to the throttle position, it may be a classic case of bog. Bog occurs when the engine rpm is low and the throttle is opened too far...the manifold vacuum goes away and the airflow thru the carb is too low for it to meter fuel. If this is the case...a change in driving style or mods to the vehicle are needed..you have to have the rpm up some if yah gonna stand on it.. If it is a off idle problem, like taking off from a stop sign and it bogs then catches up it is most likely an accellerator pump adjustment problem...here is another perspective...does it bog at the same throttle POSITION every time...or is it RPM related??

Dawg[addsig]

 

[chinard]

1061209

Actually i had the same thing for a while...
there were a couple of things that i did to fix it...
First i installed the TFI ignition upgrade... That helped the engine rev up a bit faster and smoother, but as far as the bog when i STOMP on the accelerator, that was easy to fix just by getting a timing gun and setting the ignition timing...

Of course now that i have the acceleration bog fixed, i now get a funny gas smell caused by the flooding (as mentioned earlier in this thread)

edited by: chinard, Mar 23, 2003 - 02:15 PM[addsig]