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Re: gas coming from black tube
Hi and welcome to FixYa,
Initially and to my knowledge, some of the hoses connected to a carb would be:
from tank through fuel shutoff valve;
in some case a vacuum hose.
Of the above, the only possible hose that would fit your description would be the overflow hose. Should this be the case, then this indicates that the float inside the carb's bowl has not moved up to engage/close the inflow valve. A workaround is to tap the bottom of the bowl to jar the float to go up as well as the shutoff the inflow valve. The drain hose would also allow fuel to flow out from the carb but that would mean the drain screw is loose/opened.
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You'll need to determine the exact source of the leak:
- Failed hose? Replace it.
- Hose not tight on coupling? If there is enough slack, cut 1/2 " off end of hose and re-install.
- Hole in tank or coupling tube. Repair or replace.
Hope this helps.
This happens when the float in the bowl sticks open. On a carborator the bowl holds gas. When the fuel pump fills the bowl the float raises and is pushing a needle valve that shuts off the gas until the float goes down and the needle valve opens and adds more gas. sometimes is sticks or the needle valve doesnt seat properly. You should rebuild it, buy a carb rebuild kit for your type of carb. It comes with new needle valves, just remember how it came appart. Good luck Robert
Actually it should be very simple... There are 4 Nuts on the carburater which you can loosen. There are some linkages from Carb to the gas pedal, Choke...They need to be remove.. but do it as to remember how to put it back when installing a new one.
Now make sure they give you a new fiber/asbestos gasket. This is important.. If it leaks... you will not get good gas milage
once the carb is on.. tighten all 4 nuts, do not overtight them, but tighten them
Also check your fuel pressure regulator, the fuel rail to fuel line connection end the injectors themselves for signs of leaking. The fuel pressure regulator has a vacuum line connected to the top of it. Make sure this is secure. If the fuel pressure regulator has failed it will allow fuel to enter the vacuum line and this will cause the smell of fuel under the hood. Also make sure that the emission control pipe from the fuel vapour canister has not become disconnected from the intake plenum.
There are 3 separate lines. Usually one is a bit smaller than the others. One line goes from the primer bulb to the tank..Usually the small one. Another goes from the tank to the carb...usually an inline filter in this line. There are 2 connections on the carburator...connect to the lower one, if you have 2 different sizes of tubing, this will be the larger of the 2. The 3rd line goes from the primer bulb to the upper carb connection...this is also a small line (if your model has 2 sizes of tubing). Good luck.
Mine will leak when one of the two tubes (one black and one yellow in the picture) that come out of the gas tank pull out. I find this is usually when someone hits them when priming the carburetor, just before starting it. I just push either the black or yellow tube back into the black rubber gasket on top of the fuel tank. The gasket is pretty tight so it sometimes takes a bit of effort.
More than once I had quite a bit of gas on my clothes by not making sure they were pushed in completely, before putting it on my back to start blowing.
The tubes should probably be a bit longer -or may have shrank a bit over time.