Drain fuel tank(loosen fuel line to carb and with line on bowl use it to direct fuel to a container), remove fuel and small oil lines (that open the oil pressure accuated sediment bowl). Then turn the bowl out (Clockwise). There is a hex section next the tank-use a wrench to get it to start to turn. Once bowl is removed, mark it with a scratch and note how it is assembled-take a picture or make a diagram on paper. Remove the six screws on top and disassemble (note: the center oil pressure port casting is assembled with concave upward (I think-also there is a little pea sized slug between the diaphram to open the valve when in use). Pull the little retainer clip off the top of the valve, remove spring retainer and spring, pull gas valve from bowl casting. Replace the little seal ring on valve. Clean all parts (be careful to avoid losing the small parts). Reverse disassembly process being sure to include little "slug" that is in bewteen the new diphrams (I use two on each side of oil pressure plate to prevent leak if one diaphram leaks although parts book only shows one diaphram on each side). Reverse disassembly process and re-intall. It is easy to do but you must pay attention to assemble it correctly and with all parts as they came apart. Make sure it seals after you are done rebuilding it buy putting assembled part back in gas tank, put a little gas in the tank, and see if gas is shut off is working or flows from sediment bowl (with gas nad oil lines removed). If it sill leaks, tear it down and look for the reason it leaks and fix it. This description may be missing some aspects of sediment bowl rebuild, but should help.
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