Disappearing Fuel (II)
A while back I started the thread about fuel evaporating from the carb on my newly landed '51 Commander. After about 4 days I'd have to really crank it get the fuel bowls filled before she'd fire up. I looked at all sorts of possible remedies, but decided to start by checking the fuel levels in the bowls - all good?? A couple of weeks back I opened the hood just after I'd got home to check the oil and noticed a 'lot' of fuel vapour coming out of a steel tube on the passenger side of the after market AFB carb, (I assumed it was the fuel bowl vent line). This concerned me a little as the thought of vapourised fuel pouring out over a hot engine didn't thrill me. So I experimented by fitting a tube from this spigot into the underside fo the air filter. I thought if it causes problems on my next run it was easy to remove on the side of the road.
Not only were there no problems, it seems to have rectified the evaporating fuel issue. I can now leave the car for a week, one pump and she fires up straight off ????? The logic escapes me, but I'm accepting it ;-) The routing of the fuel bowl vent shouldn't have made any difference to the evaporation. My only therory is that there is some condensed fuel in the bend of the tube, which loops down before going up into the air filter, thereby sealing the vent. Anyone else have a therory?
A while back I started the thread about fuel evaporating from the carb on my newly landed '51 Commander. After about 4 days I'd have to really crank it get the fuel bowls filled before she'd fire up. I looked at all sorts of possible remedies, but decided to start by checking the fuel levels in the bowls - all good?? A couple of weeks back I opened the hood just after I'd got home to check the oil and noticed a 'lot' of fuel vapour coming out of a steel tube on the passenger side of the after market AFB carb, (I assumed it was the fuel bowl vent line). This concerned me a little as the thought of vapourised fuel pouring out over a hot engine didn't thrill me. So I experimented by fitting a tube from this spigot into the underside fo the air filter. I thought if it causes problems on my next run it was easy to remove on the side of the road.
Not only were there no problems, it seems to have rectified the evaporating fuel issue. I can now leave the car for a week, one pump and she fires up straight off ????? The logic escapes me, but I'm accepting it ;-) The routing of the fuel bowl vent shouldn't have made any difference to the evaporation. My only therory is that there is some condensed fuel in the bend of the tube, which loops down before going up into the air filter, thereby sealing the vent. Anyone else have a therory?
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