Morris Minor Owners Club

I have a problem with carb flooding on idle or if the ignition is turned on without the engine running needle valve and float seem ok engine is stanard 1098

Has this only recently started to happen?

Is it the correct variant of the correct (SU) petrol pump? Many modern replacements are designed to give a much higher output pressure.

The most likely cause is either a tiny piece of dirt, or wear of the needle and /or seat. If you take the needle seat out of the lid, it is strongly recommended that you use either the correct special tool, or as a minimum a closely fitting box spanner or hex socket. The valve body is very easily distorted if you go for it with a mole wrench. Check the fuel level, as shown in the manual, and if anything, err on the side of setting it a bit low (i.e. a bigger diameter test bar).

Spares from the usual suspects or direct from the people who've bought the SU rights, http://www.sucarb.co.uk/

Kevin

It can really only overflow/flood if the needle valve is passing.....assuming the float bowl is vertical of course? Take the needle right out and inspect - does it have a ridge worn on it?

thanks for your reply i have only had the car 2 weeks will fit new needle valve today it has had the problem since i got it

my fuel pump packed up recently, and i replaced it with a new one, there after i had fuel bowl flooding, the only way i could stop it was to reset the float using a slightly larger diameter bar, ie a bit more clearance, could have been more pressure from the new pump?

Thank you for your advice have fitted genuine su fuel pump and new needle valve ass no more overflowing pump that was fitted was fawcet not su so i guess it making too much pressure thanks[frame][/frame]

Oh yes -= the fawcett is a high pressure pump not suitable at all.......