I noticed the fuel tank leaking in my Nexstar so I cahnged it for a new one.... However, now when I fuel the tank it fills the carb with fuel..... Could this be some sort of venting problem? It's installed correctly and the vent (pink) hose is towards the top...

Any ideas?

Thanks

You should be filling from the carb line, not from the vent line

You may have crossed the vent line with the fill line?

But it make more sense like Minnflyer said, if a line is connected to the carburetor, then you are not filling the tank correctly

I fill from the fill tube.... They have 3 tubes, vent (pink), carb (blue), and fill (green).

Then you you could be trying to fill the tank too fast or your vent line is plugged?

Without asking "why" I will just skip to recommending you pinch the carb line with hemostats when you fill if that is your set-up. Unless the Nexstar has a full cowl that's a bit of overkill.

That, or plug the vent line and fill from the carb line.

Pull the muffler line, too, so you can see when the tank is full or you'll fill the muffler, too.

They have been known to put the wrong color lines on the tubes.

To add to what Charlie P. suggested.
I also added a piece of heat shrink to the jaws of the hemostats to prevent them from puncturing my fuel line. (a piece of electrical tape would probably work)

Before you run out and get a hemostat, check the tank.

Remove the two lines from the muffler and Carb, and unplug the fill line. Then blow into the fill line (Or the carb line). Next, blow into the vent line. If the vent is plugged (Which is what it sounds like) it will be harder to blow through than either of the other two.

It may be that you crimped the brass vent tubing when you bent it toward the top of the tank.

I agree with Minn. but if you don'y already have a set of hemostats you should get a set anyway as they are one of the most usefull tools and modeler could have.

What MF and MM said.

Handiest thing I have "invented" for replacing a tank is to stick 9" Nylon cable ties in the fuel and pressure hose before fitting it into the plane. These are easy to thread through the bulkhead; even with the engine still in place.

I replace my fuel lines every Spring. Saves much of the wasted time tuning an engine only to find a small hole sucking air at the tank fitting. I can't tell you how many times mystery dead-sticks with 1/2 a tank of fuel left or irregular throttle response (falsing lean settings) were due to a pin-hole in a fuel line to the carb.

Have you got any pictures to show what you are talking about?

No, but I can take some.

Here you go. Cable ties into the tank tubes. Ties threaded through bulkhead. Tank pushed from behind as ties keep the tubes lined up. I suppose you could use longer ties and start them through from the front and slip the hoses over the tips and then pull them back out.

Saves a bit of frustration. Also shown are my hemostats with a length of fuel line slipped over the tips to make them less apt to damage the "good" tube. I slit the length halfway across in the middle and slide the hemostat tips in. That way it stays hinged in the center and the parts over the jaws doesn't slip off like it might if it was two pieces.

hxman,
I've helped a number of NexSTAR owners, this year during training nights, and at least half of them had the colors mixed up.
Assuming you haven't been airborne, yet, you'll probably have difficulty getting the engine to run. Because, the carb is connected to the vent tube in the tank. Remove the tank and verify which color tubing is connected where, in the stopper.

Let us know.

EJ

I do what Charlie does, but I use inner pushrod tubes - they're longer so I have more room to work with them.