Anybody familiar with webers? A customer asked me to look at his webers on his bmw, he said they were leaking fuel into the motor. I tried the standard float adjustment and the leak persisted, in just one set of carbs. I took the carb apart and the float had liquid in it! After 30 years of checking br*** floats i finally found one that had a leak. No problem, i brought it back to the shop to find where the leak is and it has been sitting here for a week, i have turned it everywhich way and cannot get the fuel to dribble out. I stuck it in the toilet and can't get the water to run in. What the hell is going on? Do these things have liquid in the floats from the factory? Did some fuel run into the float and then reseal itself? Anybody else have an idea? It is just a lump of soldered br*** and i can't make sense out of it. Thanks, oj
What kind of Webers are they? In my experience with them, the floats are no different from any other carb and if there's liquid in one of them, it may be that it's not sealing the needle valve. My thinking is that the leak is so small that it's taken ages for any fluid to get inside. Is it worth drilling a hole to drain out whatever's there and resealing all of the joints, or perhaps just get a new float? PM me if you really get stuck.
They are sidedrafts, the floats are round, 2 of them on a common tye/shaft one float in each well. The needle & seat ride on a tab off the common tye/shaft. I thought about unsoldering the air vent hole in the float and letting the liquid run out and soldering it up again but how did the liquid get in to begin with, must be another hole somewhere and it is in each float. Just an FM
Webers usually dont like alot of fuel pressure, check the specs, try redline.com. usually 2-3 lbs on the one I had one my roadster.
water is thicker and heavier than gas A float thats float in water may sink in gas and leak gas but not water Webers is also known to have bad floatvalves some times There was some better valves offered i think they was caled Flojets
If the float has liquid in it, hold it in different positions while giving it a gentle squeeze. You will see a very fine stream shoot out the hole.. The hole can be too small to simply dribble out of..
Replace the floats and the needle and keep the pressure below 5 psi and you should be able to set them up to run superbly. You've got a bad float.
A br*** float may be tested by submerging in very hot water. The hot water will cause the air inside the float to expand thus creating internal pressure. This pressure will escape in the form of visable bubbles. Once the leak has been detected, the fuel may be driven from the float by rotating the float until the leak is on the bottom, and again submerging in hot water. The pressure will blow the fuel out of the float. One may have to do the submerge and then air-cool several times until all of the fuel has been removed. The float may then be repaired. Jon.
The Jalopy Journal
