Post by Scoutpilot on Dec 28, 2014 7:33:45 GMT -5
Many years ago, running without a fuel filter was not considered to be problematic. Over time this has proven to be bad advice. I strongly recommend a filter between the gas tank and the pump and a filter between the pump and the carburetor. Fuel flows directly from the tank to the pump in a non-filtered system. The pump has a Brass mesh screen to catch the bigger particles from the tank, but that fuel has to pass through the pump's intake valve before it is strained. This can lead to premature wear and failure of the valve and diaphragm. After the pump, there is only a small Brass mesh screen in the WO, a large brass screen at the fuel inlet with a small brass screen in the idle circuit of the YS, and nothing in the YF. Valves and jets can and will become blocked and your carbs performance will suffer.
You could do worse than choosing a proper filter setup. If you don't care about period correctness, any auto parts store will have the plastic filters you replace annually. Get a clear one so you can see what's in the fuel. If you are period-correct conscious, I recommend the top-of-the-line Carter Lifetime Ceramic Filter. It comes in various models as seen below. In-line ceramic filters, as seen at the bottom come in popular sizes for your fuel line, but are not always available. I recommend them for the position between the tank and pump as they can be easily placed in the frame rail.
The glass bowl filter is serviced annually by disassembling and backflushing the ceramic element and replacing the gasket and spring if necessary.
