In my last post, I explained that my stock ZS carb had given up the ghost, and 3 rebuilds had not been able to resolve the main problem - that of raw fuel overflowing from the carb vent after a few minutes of running.
I replaced the carb with a new Webber DGV 32/36 and was amazed that it started and ran quite well - for a few minutes. While waiting for the engine to reach full operating temp, I observed that raw fuel began to drip from the secondary, and then the primary. Once it started the car began to belch and cough.
I have a mechanical pump - one I paid a little extra for back in April. 3 rebuilds and now a new carb is having a similar problem. Oddly, I've put several thousand miles on the fuel pump and old carb before this started.
Could the pump have suddenly begun putting out a higher pressure? or am I simply incapable of checking a float height correctly
Drop a fuel pressure regulator in line. This is a really common problem. I had it on my Morgan also on my wifes Spit. SU's like about 3 lbs pressure. In the Morgan I found the old electric fuel pump all of a sudden puting out 11-12 lbs. then 1000 miles later gave out. Fuel regulator did the trick so it stays in line. The electric pump has two advantages. It keep working at a constant speed no matter what revs... and ... it will fill the float bolls before you start. This is an advantage for starts after a while of sitting where the level can drop in the floats due to evaporation. The regulator keep the pressure constant no matter what the speed of the engine.
cheers Marv
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