Great Power 38

Just a thought Phil. The "new" petrol at the pumps has alcohol in it. I wondered if this could have affected the tube inside the fuel tank, swelling it and effectively closing the bore?

Not fuel lines Brian. Carburetor issue or pulse issue. ie; flappers or there is a blockage in the carb body or I have overlooked something obvious.

Phil Ford wrote:

Not fuel lines Brian. Carburetor issue or pulse issue. ie; flappers or there is a blockage in the carb body or I have overlooked something obvious.

Ignition !

No fuel John. Dry spark plug. Squirt some down the carb mouth and it will fire straight away.

Went over to Kevin's on Sunday for some testing Carb is fine. The HDA 246A carb appears to be designed especially for GP engines with an extra high jet for for fast opening of throttle. Crankcase has no air leaks. Reed block and reeds look a bit suspect. Two out of four are not fully closing. Have asked for advice on latter from Clive McInness at AerobatX. They keep GP engine spares unlike some others I won't mention.

Monday 4th - Check if fuel pump is actually working. Reassembled the carb and reed blocks and mounted on the engine. Clamped engine into my work bench. Removed spark plug, fit prop and spinner. Spin engine over and watch fuel moving up the line. Remove regulator cover and whilst spinning motor over depress needle valve. Fuel appears! :huh: That's a good sign.If weather holds off today I will refit the engine to the Extra and see what happens..........Images not necessarily in right order.. Kevin cleans up reeds and checks them with suck n blow. A cut down credit card bolted to reed block with an fuel line adaptor.

Engine refitted to airframe. Fueled up. Flick it over and fuel pulling in to engine. Choke on. Flipped a few times and no kick? Choke off, throttle a little open, flick and nothing. Remove plug. Flooded. Dry plug. Try again this time just throttle. KIcked once or twice and bouncing back on compression and then nothing.

I am at a loss here. I have had enough of this crap. I have spent around 8 hours over the past weeks on this. Take the flipping thing out and send it back under warranty. Should not be fannying about like this in the amount of runtime this engine has had.