pet_cocks

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Petrol Taps (pet cocks)
How to clear a blockage:

Either remove the petrol pipe from the carb to the tank at the carb end, or use a separate tube and fit it to the fuel line connection on the tap.

Place the open of the tube in your mouth and blow. While you are blowing, open the petrol tap. You will be able to feel the pressure change and you should be able to hear bubbling from the tank, if you can hear the bubbling, you know any blockage has been removed..

Then, whilst still blowing, turn the tap onto the Reserve setting and repeat the process.
This work for both gravity fed & diaphragm types of pet cocks.

Petrol Pumps
How to check:

Locate the tube which leave the pump & connects to the carburetor.

Either remove the petrol pipe from the carb to the pump at the carb end, or use a separate tube and fit it to the fuel pump. Feed the open of the tube, onto a glass bottle, and then making the petrol tap is on the "ON" or the "Reserve" setting, and there is fuel in the tank, turn on the ignition and turn the engine over using the started motor (if fitted). If the bottle begins to fill up with fuel, you'll know it's working.

If it doesn't, then check the electrical connections, and fuse (when fitted). If the motor seems to be turning, but no fuel is pumped into the bottle, then it's probably the impeller, and the whole pump will need replacing.
If the wiring is not damaged and seems to have good connections, and the fuse is still ok, it's likely that the motor itself has burned out, again you will have replace the pump.

This is just a general guide.
If you are about to do your own maintenance, using these pages, I take no responsibility if you get things wrong!
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