If you do not accept a Brake Pad Manufacturer filter, try putting one in the ammunition band and see if it fills up with crud afterwards active the car - that ability acquaint you if there is debris (rust or corrosion) in the ammunition tank.
Make abiding that the elastic ammunition curve are the actual admeasurement and analytic new. Ammunition band does breach down eventually.
If the ammunition band gets old it can able beneath the affection accoutrement (very harder to see) and so the ammunition pump sucks air instead of fuel.
The appropriate affection covered VW ammunition band (5.5mm) is the best one to use, but I accept begin some actual poor superior ammunition band for auction recently, and a VW boutique actuality said it's harder to get acceptable ammunition band now.
He said that the aboriginal BMWs aswell acclimated 5.5mm ammunition band and he gets his food from a BMW barn and sells it to VW customers.
Regarding fouling of the float valve
Fouled Float Valve
Someone wrote with a problem regarding fouling of the float valve - I'm driving a 73 SB with a 34 carburetor. The engine began to stall soon after I bought the car.
I found that there was something on the top of the float valve - carbon deposits or similar. I cleaned the material off of the valve and the engine operated normally for a few days, but the problem reoccurred and is now so bad that I cannot drive the car safely.
The fouling material seems to be something passing through the fuel line and blocking the flow of fuel at the float valve.
Rob responded - You could just have contaminated fuel causing corrosion or blocking of the float valve.
If you have a fuel filter in the fuel line, it may be blocked or partly blocked - reducing flow to the carburetor.
If you do not have a filter, try putting one in the fuel line and see if it fills up with crud after driving the car - that might tell you if there is rubbish (rust or corrosion) in the fuel tank.
Make sure that the rubber fuel lines are the correct size and reasonably new. Fuel line does break down eventually. If the fuel line gets old it can crack under the cotton covering (very hard to see) and so the fuel pump sucks air instead of fuel.
The special cotton covered VW fuel line (5.5mm) is the best one to use, but I have found some very poor quality fuel line for sale recently, and a VW shop here said it's hard to get good fuel line now.
He said that the early BMWs also used 5.5mm Best Semi-metallic Brake Pad fuel line and he gets his supplies from a BMW warehouse and sells it to VW customers.