Solex pdsi 36-40 carb.

[Brian OC]

1. My carb has two problems, when engine is running, petrol overflows through the vent  tube on top of the carb. The needle valve is ok, float seems to be fine? When tested on the bench it works fine.? But back on the engine it plays up again.

 

2. When the engine is switch off, petrol discharges into the carb body for twenty seconds until float chamber is nearly empty.

 

PLEASE HELP!!!!!!!!

 

BRIAN

 

 

 

 

 

[tech71]

56 minutes ago, Brian OC said:

The needle valve is ok, float seems to be fine?

you dont sound so sure about that. Need more info/background. For one, what kind of fuel pump is installed? Mechanical? Electric?

Any recent work on the car fuel system? 

[Mike Self]

1. Take the float out and shake it.  Solex floats are known to leak and if there's gas inside you'll hear it slosh.  Can't be fixed; you'll have to replace.

2. Check to make sure the plastic retainer is in place above the brass float pivot pin.

 

3. If it's OK and you're sure the needle valve is good, bend the float arm so the float rides higher and cuts the gas flow off sooner.

 

mike 

[Brian OC]

Many thanks for your advice.

 

The valve needle is new and works fine.

I have checked the float and that is also air right and works fine when I fill the float chamber.

the plastic clip is in place rather right way round.

The fuel pump is a mechanical one, so it have been working constantly the same for forty four years. 

The fuel has been changed to super unleaded because I only have two choices of fuel E10 which is unsuitable and E5 the super unleaded. I always use an additive when refuelling.

 

As I said I have taken the carb off the engine and it works fine on the bench.

 

The  only thing I can think of is that the float is sticking somewhere in the float chamber.

 

I will take the advice and bend the float arm but scared as it appears to be quite fragile, again it works fine on the bench???

 

Any advice on the draining of the fuel after I switch the engine off? Driving me crackers sorting it out. Had the same car in 1985 when I stripped it down and reconditioned the engine.

[Son of Marty]

2 hours ago, Mike Self said:

ake the float out and shake it.  Solex floats are known to leak and if there's gas inside you'll hear it

The float will also get cooler as the gas gets on the sides of the float and try's to vaporize.

[Lorin]

5 hours ago, Brian OC said:

Many thanks for your advice.

 

The valve needle is new and works fine.

I have checked the float and that is also air right and works fine when I fill the float chamber.

the plastic clip is in place rather right way round.

The fuel pump is a mechanical one, so it have been working constantly the same for forty four years. 

The fuel has been changed to super unleaded because I only have two choices of fuel E10 which is unsuitable and E5 the super unleaded. I always use an additive when refuelling.

 

 

While I 100% agree that E10 is unsuitable for a 2002 as a model designation, it will run fine on the fuel. 
 

Of course less alcohol in the fuel is certainly easier on the seals and hoses of the fuel system.