At 01:22 PM 30/10/03, you wrote:
>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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