Just bought a used PC-9 and installed a OS 46fx and can't figure out why the carb keeps flooding. Do I have the tank mounted to high.
HELP!!!
Frank[]

How far out is the needle valve?

1-1/8th turns

1-1/8th turns

hmmm .....Did you check the height of the tank in relation to the engine?

John

Yes, the tank is mounted higher than the carb because the engine is inverted. I mounted the tank in the hole that was cut thru the firewall.
Frank

Frank - need to askl if you use the fuel line to the carb for filling up. For inverted engines try to use a 2 line system, if the carb is exposed then use the fuel line to the carb to re-fuel. If not then use a re-fueling valve. After you have fueled up DO NOT prime the engine. Just start it with an electric starter and it will not be so prone to flooding. Also, make sure the throttle is always in the low position.

I have run 4C and 2C engines inverted and I hardly have problems, I do not re-position my tanks, its always stock.

proptwister

had a pc-9 myself, the tank sits too high, in relation to the carb you have to lower the tank, i did that by taking out the dowel that supports the tank. and lowering the tank it self. and putting foam to support the tank-----------it worked
out fine.
the model flew great -----lost it to dumb thumbs
hope this helps
len logun

No, it has a full cowl so I have to use a fuel valve. I do have the carb open a little. Maybe I need to keep it closed to crank it since the fuel is already there.

Thanks Len,
That makes good sense to me as well. It is do that or remount the engine on its side. Believe lowering the tank would be the trick.

Thanks again for the heads up.
Frank

Thanks everyone for your feedback. I think Len has solved the mystery.
Frank

That was most of it I believe. I lowered the tank and ran a separate fueling line and BINGO... she runs like a big dog.
Thanks for the tip,
Frank

Yep, that did it. I also ran a separate fueling line b/c when fueling, the carb dripped fuel. She runs fine now....Thank's for the tip.
Frank
SR Proptwister
fw

Yep, lowered the tank and ran a separate fuel line and BINGO, she runs great.

Thanks again.
This forum is awesome.
Frank
SR Proptwister