Weber Jetting Survey

[Gaz64]

Originally Posted by jhirasak

Gday Gary,

I think that when the gas in the pump chamber starts to percolate, it provides sufficient pressure to seat the inlet check valve and, without a bleed outlet, the gas and expanding vapor bubble pushes the gas inside the pump chamber out of the jet into the throat of the carb. That is a guess on my part as what was going on. In any event, after I changed to a bleed valve with a .50mm orifice, my fuel dripping problem became a bad memory in the past.

Since you live down under, do you have alcohol added to your pump gas by mandate of the government? The justification by the authorities was that this was added to our gas to reduce emissions problems. I am not sure about the validity of their explanation regarding the reduction of emissions but I am sure that it has caused us some corrosion and driveability problems with older cars.

Cheers Mate,

John

Hi John,

I see your point, and if it works for you, then you must have had nylon check valves in the 00 pump exhaust valves. The nylon balls seat faster then steel.

We have had ethanol blended fuels for some time now, it's a lottery what you get now.