ORIGINAL: ameyam
Ok, hold on a minute, ''presuming'' was a soft way of asking so no issues.
I understand. I didn't want you to get confused, and create problems that didn't exist.
Is the centreline of the spray bar the same as centreline of the crank? Please clarify
No. Open the carb throttle all the way. The tube you see going across the opening, is the spraybar. Ideally, this should be at the centerline of the fuel tank. Which is, usually but not always, the center of the stopper.
The centerline of the crank is the same as the prop shaft.
Old tank, so couldnt get it open. It is probably not in use for a couple of years or my instructor checked it before he gave me the plane. This is because, when both of us were struggling with the tuning, he never offered to change / check the tank. Very early in the course of the problem, I got a Dubro tank with the express objective of replacing the original. He didnt seem to keen to replace it. This dubro tank dosent fit in exactly so I didnt try too hard.
It would be a good idea to remove the old tank, if nothing more than to verify its condition, or check for irregularities.
That reminds me, I have a very similar tank in my high winger. Will try it in my next attempt with the plane
Good idea, too. But, remember, just replacing parts may not tell you what the original problem was. Investigation can help educate.
Good luck, and let us know how you're progressing,
EJ