air bubbles Options

[Gearren]

I have just got my 73 2.0 back and running, rebuilt the carbs, new distribtor, points, wirers, ect., but just the other day while trying to tune the carbs I noticed air bubbles cumming up through the clear fuel line that comes through the body of the car and the are bubble are collecting to for one big bubble in the hose just before the carb., any ideas.

[ArtechnikA]

Where is your pump mounted?

i have most observed this phenomonon on a succession of T-I and T-III VW engines and the 356, where the mechanical fuel pump is bolted to the crankcase and actuated by a pushrod off the distributor drive gear. i've seen it to a lesser extent in the 914.6 where the pump was still located in its original place, under the tin. IIRC (been a while...) the hot air from the 914.6 heat exchanger dump valve isn't quite as badly located as it was with the 914.4 ...

after that cama a succession of fuel-injected cars with opaque lines...

if it's really hot, you could be seeing a bit of pre-vapor lock.

it would be prudent, of course, to check for leaks, because if air is getting in, fuel is probably getting out. i think you're just seeing the result of entrained air due to sloshing, however...