QuestionI have a 1967 Austin 3000 Mk lll. I have not started in a year, When I did try
it almost started then stalled, I notice that gas was leaking out the small pipe
under the in take manifold. please advise.. thank you for your time
AnswerYou almost certainly have a stuck float needle in the lid of the carb. The little pipe is the overflow from the float chamber. If the theory is right, you should also get an overflow when you turn on the ignition (and fuel supply), without the engine running.
I would do both carbs, but one at a time. I think this might work.
Unscrew the float chamber top, but leaving the fuel inlet tube attached. Look down inside the chamber. If noticeable crud in the bottom, clean as far as possible with paper towels, or lint-free rags. Wrapping a rag around the end of a 1/4-inch dowel works well (wood won't scratch the chamber).
With paper towels or rags in hand under the dangling lid, have someone turn on the ignition (i.e. fuel pump). You should be quick about this: while fuel is pumping all over the place, dab the float up and down a couple of times with your finger. When you close the valve with your finger, fuel flow must stop. Turn off ignition. If all OK, replace float chamber lid, making sure gasket seats properly on the rim. Do it with the other carb.
Next, pray! The only thing I can't answer is why the engine stalled with this problem, since the float chamber(s) would have been full even with the leak. So you might also need a quick clean-the-jets procedure. You'll need the air-cleaners off for this. Get the engine running, with helper. Bring the rpm to about 2500, and get your helper to hit the pedal *just* as you put your hand (or other fairly solid thing) over the air intake of each carb in turn. Replace air cleaners.
Pray again! Hope it works. Next time, put a can of fuel stabilizer in your tank for the final run before you put the car to bed. It should prevent most "sticky" problems, which is what this sounds like.
Hope it is ready for Spring!
JJ
