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Originally Posted by Robs Hubris
...Diagnostic implications?
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If it's clicking then it has power and is likely working.
It makes a "louder" clicking when first turned on and then as fuel moves thru it the sound becomes muted or dampened.
As others have mentioned the real diagnostic tool is an inline pressure gauge.
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The external tank test seems a great idea; not sure how I pull it off...
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• Get a gas can. 1 gallon will work but 5 gallon is better.
• Get 2-3 feet of ¼" fuel hose. (Same ID as connected to your carb)
• Disconnect your existing fuel hose from the carb.
Some gas will spill out here but elevate the end of the hose to stop the flow.
(you can also plug it with a bolt)
• Connect the ¼" hose to the carb and put the other end into the gas can.
• ELEVATE the gas can above the carb.
(on your C30 this should be easy)
Now start the engine. The gravity flow should supply enough fuel to overcome not having a fuel pump and keep the engine running.
Do this test and report back. It'll tell us a lot and we can drill down from there.
FWIW, I'm leaning to Neil's idea of the PU tube.
