@simon posted:Marlinjack, from what I know Webers always use electric fuelpumps , Webers needs a higher and constant fuelpressure.
Simon
IDA Webers need only 3 to 5 psi fuel pressure. The electric fuel pump is used most often to prime the carbs when they are dry from sitting.
They run fine on just the mechanical pump. In fact, if you use the Holley mechanical fuel pump that puts out 7-8psi, you MUST use a pressure regulator to reduce the pressure to the carbs. Absolute max to them is 5 psi.
This is exactly how the original 289 Shelby Cobra factory race cars were set up but used the stock Ford Mechanical pump. That pump is rated at 3 to 5 psi.
Once the engine was started, the drivers turned off the electric fuel pump and ran the race on the mechanical pump.
It COULD be water in the fuel but it actually has symptoms of the roll pin failing and twisting on the distributor drive gear.
Why this is so prevalent on the Clevelands is beyond me but it does seem more then just coincidental that the distributors that have this issue often only after they were "rebuilt" and use a chrome molly oil pump drive shaft?
All due respect to your BMW guy but there are no "Clevelands" in BMW's that I know of. This is a unique problem to the Cleveland engine.