Isolate and Eliminate - move systematically thru the system 1 item at a time, verify that is working and go to the next item. Doing the extra tank does eliminate the entire tank and filter, then you know further in. The carbs will have a drain screw in the bottom but I doubt that all of them are plugged up but draining will get any crap in the bottom out, squeezing the bulb will flush the whole system - the diaphram fuel pump is a good candidate and a rebuild kit is a minimal cost, check everything along the road, starting at the tank - filter - connector - and just keep going it has to be there someplace
If its a carbed motor with just a diaphram pump it can be bypassed by squeezing the bulb, at least that works on Rudes, although a new diaphram probably wouldn't hurt, should be a DIY job
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Any way you measure it - dumbass is expensive
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