Re: Gas tank pick-up tube/sending unit assy for '39???

Posted by HH56 On 2018/5/17 20:36:57

What kind of fuel filter do you have? Paper or modern probably no issue but if the original ceramic type I had an problem where the filter was partially clogged with varnish -- most likely from fuel periodically drying in the bowl during long sits between runs. Air would flow thru easily so pump would fill the bowl and filter would allow enough fuel to trickle past and run the engine at idle just fine. The issue came when needing enough flow to go faster than idle or a slow speed. The filter being clogged just would not allow enough fuel to pass to keep the carb full with the increased demand. The bowl would also get fairly empty then too and attributed that to perhaps todays more volatile fuel "boiling" from the manifold heat because it was moving fairly slow and allowing the gasses to accumulate in the bowl.