Wed Dec 30, 2020 9:10 pm
#1817094
I've just had my permit inspection, with its associated maintenance work; so, to inspect for any fuel or oil leaks after the necessary removal and replacement of components, I did a quick run-up with the cowling off.
All good, with a nice improvement in tickover smoothness with a brand new set of plugs in.
I climbed out, had a look round the engine and then started to push back into the hangar.
Then- fuel started dripping from the open tubular part of the air intake system (C90- Bracket air filter) that is the lowest part under the carb.
It started well after shutdown - 3 or 4 min? - and stopped after maybe 60 seconds, all after movement over a grass surface.
The total expelled was, maybe, a decent eggcup-ful or two.
Any ideas as to whether this is normal or a problem developing?
I assume that the feed system to the carb bowl remained pressurised after the engine stopped, and for some reason the fuel "expanded" ? and overflowed out of the main jet; or else the float needle let by after the carb was jiggled about ( I don't like this scenario much)
This may well happen in normal circumstances, but I wouldn't easily see it as the fuel would run down the lower cowling to a point under the aircraft that is low and quite far back.
Anyone else seen this phenomenon ?
All good, with a nice improvement in tickover smoothness with a brand new set of plugs in.
I climbed out, had a look round the engine and then started to push back into the hangar.
Then- fuel started dripping from the open tubular part of the air intake system (C90- Bracket air filter) that is the lowest part under the carb.
It started well after shutdown - 3 or 4 min? - and stopped after maybe 60 seconds, all after movement over a grass surface.
The total expelled was, maybe, a decent eggcup-ful or two.
Any ideas as to whether this is normal or a problem developing?
I assume that the feed system to the carb bowl remained pressurised after the engine stopped, and for some reason the fuel "expanded" ? and overflowed out of the main jet; or else the float needle let by after the carb was jiggled about ( I don't like this scenario much)
This may well happen in normal circumstances, but I wouldn't easily see it as the fuel would run down the lower cowling to a point under the aircraft that is low and quite far back.
Anyone else seen this phenomenon ?