Originally Posted by oceans
no it doesnt start, could it be since the low needle is stuck at the close position its not letting the fuel from the line into the carb? would explain why if i drop fuel in the carb it would start?
If you can flood the engine then the low speed needle is getting fuel into the engine...that was my point...
it only starts for few seconds so I'm not sure about the idle,
So which is it? It only starts for a few seconds or it doesn't start at all. Big difference there. Or are you saying it only starts for a few seconds when you put fuel directly in the carb?
I'm GUESSING it's not starting at all but the fact you can get it to flood is the confusing part. It sounds like a fuel delievery issue...but getting it to flood (by covering the exhaust and trying to start it) means you CAN get fuel into the engine through the fuel system.
I'd say your tank has a small leak somewhere or a blockage in the fuel lines/needles. By over-pressurizing it with the exhaust being covered it's enough to get fuel into the engine but when you are only trying to draw fuel in by the vacuum of the engine and the much lower normal backpressure of the exhaust it's not enough to move the fuel.
I'm guessing the car and engine have been sitting for a while. If so, keep in mind that if it sat with fuel in it, fuel gums up over time and can block fuel passages in the carb and lines.
With it not starting at full throttle the low speed needle itself is eleminated as a culprit since at full throttle it is out of the equasion...but it's seat isn't. The low speed needle seat...where the low speed needle goes into when the throttle is closed or at low speed...is also reffered to as the Mid-range adjustment or Mid-range needle. (But isn't really a needle at all.) It is through this hole that all your fuel enters the carb throat to mix with the incoming air. The amount of fuel that passes through this opening is controlled by the high speed needle. The low speed needle just further restricts flow at low speeds.
Start by taking apart your carb and soaking it in NEW fuel overnight. If you can't get your low speed needle to budge out of the carb barrel, soak it as a unit and see if it can be moved the next day. The needle could just be gummed up with bad fuel. If you can take it out, resoak the barrel and slow speed needle to fully clean them.
If it still doesn't move, it could be the previous owner over-tightened the low speed needle and siezed it in the barrel. In this case, the low speed needle may be damaged beyond salvation and need replacing. I would also replace the low speed seat (mid-range "needle") if possible and maybe the barrel if the low speed needle cannot be removed at all.
Take the easiest stuff first and eleminate that as possibilities. Hook up a different tank, replace lines, try and clean the carb. Those are all free (seeing as how you have "other" nitro cars you have been trying those glow plugs on) and this eleminates them as possibilities right off the bat. Then go into replacing parts.