32 replies to this topic

[mkw]

Did you renew just the needle valve only or both the valve and the brass seating? They should always be renewed as a pair.

I renewed it with the minispares super flow jobby.

 

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[mkw]

It sounds like there is confusion going on here.

The float chamber valve (needle) will stop the fuel from the pump entering the float chamber if it is full such as low revs.

Think of you toilet sane idea the pressure is always there but does not pass.

Hence the pump question earlier as the needle will not stop the fuel at a higher pressure of many electric pumps.

If the carb needle is full of crap etc it will have no bearing on the float overflow passing fuel.

There are only two things. Too much pressure or a faulty (dirty) float chamber valve.

There is a third option. Is this a replacement carb? Are you sure is is a single carb and not one of a pair with fuel take off/inlet for a second carb?

I think we are at a pictures time. Arrows of where fuel is coming out would be excellent.

 

The carb is the original one that came with the car when i bought it, i've had 8 or 9 years good service until the last time i was out in the car when this problem occurred.

 

As for pictures, there isn't a lot to see. Fuel is coming out of the overflow pipe down by the subframe and dropping on the garage floor. The engine then dies at this point.

 

I'm looking to get a float chamber lid off of someone for testing purposes but i can't see why my lid would suddenly cause this..

[nicklouse]

It only would if the valve seat is not screwed in correctly or... It has corroded and no longer seals the seat in the housing.