I'm sure that some people on here may have encountered this before, but thought i would share it.
On my recent purchase, one of my tasks was to sort the leaking float bowls. Having done this loads of times, I was filled with confidence,(stoopidly). Cleaned the float needles and seat, checked the floats were actually floating, set the float height and they all overflowed.
Replaced the float needles and seats, checked the float height again and to my annoyance they all overflowed
I was starting to get desperate now as it meant that I would have to now engage my brain. I decided to lower the float height as an experiment and it achieved the same result. I made an adaptor to attached a tube to the float bowl so I could observe the actual fluid level. To my surprise, it was well below the top of the overflow. On a whim, I removed the bowl and filled it with petrol and it leaked through the overflow! This was a surprise to say the least. I checked the other three bowls and they all did the same. I checked the brass tubes with a magnifying glass and realised that they all had hair line cracks in them.
So my question is, how did it happen? I wondered if it was my ultrasonic cleaner, resonance from the engine or water in the fuel that had frozen at some point. I was thinking over drilling it out and soldering in some 3mm brass tube or just soldering the crack with solder and drilling it out again. Any thoughts good people.