Weber 40 IDF is dripping Options

[malcolm2]

Nice day for a drive yesterday.... Drove some, filled up with gas and drove a bit more.



Woke up this morning to smell gas in the garage and noticed a pool of fuel on the floor.

I removed the air filter and see a drip in one barrel. 1 barrel is very wet and even has a pool sitting on one side of the plate. The others are wet, so they could be dripping, but less frequent. You know gas, it will evaporate pretty quick.

looks to be coming from the center of #14, Aux Venturi. I removed the Main Jet on that barrel (47 - 50), hoping to get it to stop dripping. I think it stopped.

What is causing this? (IMG:style_emoticons/default/WTF.gif)

I should add that Dual Carbs are new, set up at AC.net... now out of business. Last summer I fully adjusted, and sync'd them. Had been running really well, parked for about a month. Total of about 800 miles on the whole rebuild.

[malcolm2]

Floats are reset to 10 and 32. Cleaned the top plate fully. Re-installed and started her up. Idled and rev'd like a champ. Maybe 3 mins. Shut her down and damn the dripping started again.

During the run, i verified my electric pump's pressure to be 2 psi.

Got one suggestion to use a float valve with a rubber tip. I see several out there in big rebuild kits for the Weber IDF 40s.

Any drawbacks there? What is next??

[Superhawk996]

Got one suggestion to use a float valve with a rubber tip. I see several out there in big rebuild kits for the Weber IDF 40s.

Any drawbacks there?

Watching this one evolve

With respect to rubber tipped needle - at this point I thought most carbs have probably been rebuilt wirh rubber tip needle.


If you don’t have them - get them. No downside to them that I’m aware of.