3 replies to this topic

[scrumpymini]

Hi all, my mini has been standing for a year and it wont start as the carb is not letting fuel through, I have removed the carb and taken off the bottom of the float bowl and there is a fair bit of brown muck inside so I guess this is stopping fuel from passing through the jet.

I will get some carb cleaner and replace any worn parts but is there a way to check fuel is flowing through OK before I put the carb back on.

 

Oh just to say the car started fine before it had been standing for a year and I did put fresh fuel in the tank after I emptied out any old fuel.

 

Ta Steve.

[Leonrjohnson]

You may want to try connecting the fuel hose to the carb inlet while it is off the engine, and with the bottom plate of the float bowl off. Then if the fuel pump is turned on, you should get fuel flow through the needle valve.

[Stiggytoo]

It should be fairly easy to tell if fuel is getting through, but if you want you could remove the top of the carb (damper assembly, piston etc).

With some fuel or other fluid in the carb, cover the fuel overflow whilst blowing through the fuel inlet. Fuel should squirt from the jet hole. This is a bit of a non test really.

If you do have the carb apart, make sure the float sits at the correct height. 

[richmondclassicsnorthwales]

Check the needle valve around the float area. The needle valve sits in a brass collet. This has a small gauze filter on it. The gauze is prone to catch all the junk, something that actually works!. Unscrew the flat head screw holding the float in. Remove the float making sure you observe how it sits with the jet upon putting it all back together.

You can now takeout the jet and blow it through.. Do not tip the carb upside down as the needle valve will fall out and then it gets lost. Place it on it's side and shake it out into your hand.

Then you can take out the brass collet with a socket. You can then clean the filter. Also look and see if you have a ridge on the rubber of the needle valve. If you do, buy a new needle valve, they come with a new brass collet , filter, seal etc etc as a kit.

You have then just given you carb a quick once over. I f  you use the same parts and do not replace anything, when you have put it all back together blow into the fuel inlet and at the same time tip the carb upside down and you should not be able to blow any more, the valve should shut off.

You should replace the rubber seal at the bottom of the float chamber, they compress and it will probably leak when new petrol goes in.

If you need any help, give me a shout 07596 541072

Regards, Neil...........