It's an old model my dad has been using and for some reason i can not get the thing started. there is gas in it, when i push fuel line rubber bubble it seems to feed the gas. Not sure what position the choke needs to be in. Is the hole to behind the choke lever supposed to be covered or uncovered? Do i need to hold the eater in certain position? I feel like getting a new one but my pops seems to e the only one to get it to work and untill the thing blows up he wil not get a new one.

I have an older model that has a weighted filter in the tank. The filter flops around and can 'fall' into the fuel no matter which way you tilt the trimmer/tank. You should have one in your tank. Feed in the new line and make the end come out the gas cap. Push the filter/weight into the end of the fuel line. Pull the extra fuel line out of the tank to match the original position. You should have cut the new line to approximately the proper or same length as the old fuel line with an angle cut so you could push it into the tank.

air bubble while you prime the bulb is normal

dont flood the carby

try a new plug

I bet it's the gas. After some time the gas will no longer be volatile enough to start the car. Try draining all the fuel and putting in some fresh gas. Remember, when you try to start it again you'll need to get the new gas through the pump and lines before it will start. Also, check the condition of the injectors. Old gas can start to break down and build up a film that could be on your injectors (or clog your fuel filter- better check that too). Hope this helps.

Test for spark. Make sure the air filter is clean. Then make sure fuel is getting from the gas tank to the carb. Old rubber fuel line deteriorate and stop up small ports and parts in the carb. An inline fuel filter is a good idea on these larger engines. Sometimes, a larger B & S engine needs the OH valves adjusted to start easily and run properly. If after attempting to start, does the new plug get wet or even smell like gas? You should always use gas LESS than 30 day old. Gas goes stale like bread and milk. You can remove the fuel line from the fuel tank at the carb to drain old gas. You can also remove the carburetor bowl to check for water and sediment (which need to be cleaned out). Check these things and post back.

Youe either have a hole in one of the fuel lines or a blocked 'primer base'

Can you see the fuel line from the gas tank to the carb? It could be bended, in a tricky position or have air bubbles on it. Any of these 3 would cause fuel starvation and make the engine to cut out after just 2 miles... You didnt tell what model of bike you have, but this is the simplest thing you can check out first :)
Hope this helps! Regards

1. Empty the fuel tank on the chainsaw of any remaining fuel. Pull the cap from the tank and turn the unit upside down. Drain the fuel into an approved fuel container. If the fuel is old (more than about a year) dispose of it according to local regulations for hazardous materials. (It can be kept longer by adding a fuel stabilizer.)
   
2. Pull the fuel line where it attaches to the carburetor using the end of the needle-nose pliers. The old fuel line may take some force to pull free from the metal tube.
   
3. Push on the fuel line to feed it into the fuel tank. Hold the chain saw upside down. Shake the unit to get the fuel filter into the opening of the tank. Pull the filter free of the tank. Feed the remaining fuel line through the access hole at the bottom of the tank. Dispose of the filter and old fuel line in accordance with disposal regulations.
   
4. Feed one end of the new fuel line into and through the bottom access hole of the fuel tank. Push approximately 6 to 8 inches into the tank. You can pull back any excess line later. Grab the end of the plastic line with the needle-nose pliers. Bring the line through the gas tank fill opening.
   
5. Attach the new filter to the end of the new fuel line. Feed the filter back into the fuel tank. Pull any excess line from the tank. You will want approximately 3 to 4 inches of fuel line inside the tank.
   
6. Route the new fuel line to the carburetor. Cut the line to length with the cutters on the needle-nose pliers. Attach the line to the metal tube.
   
7. Fill the fuel tank with fresh gas-oil fuel for 2-stroke engines and start the chainsaw. It may take a few pulls to prime the new line with fuel.
   
8. Some models come with a priming bulb. Make sure you press the priming bulb three to four times before trying to start. This will prime the gas lines and remove any excess air trapped in the lines.
   

The gas bubble is a primer. You push it 2 to 3 times to put fuel in the card before you start the motor.

check fuel rail has fuel there is a valve like a tire in the fuel rail push down on it and bleed the air out
if there is no air presure then the filter is full o ****

turn ignition on and off a few times without cranking it turn on for 5 secs then off 4-5 times

Sounds like you have dirt in carburetor.

Check the fuel lines for cracks/breaks. If they are o.k., then:

You will need to disassemble the carburetor and spray with carb.cleaner.Make sure the small screen is free of debris. (Should be able to see daylight through it.)

Use a Den Tek Brush, (http://www.drugstore.com/products/prod.asp?pid=165357&catid=1152),to clean the small portals in carb. These portals can become blocked. Reassemble and start.

If the carb. parts are more than 4 years old, you may have to replace them.

If you need further assistance on:
1. Fuel line replacement or
2. Carburetor kit replacement

Just let me know.

Jim