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scicala · 07-06-2021, 09:40 PM

You want the accel pump diaphragm for 30 cc. The 50cc diaphragm is too tall for your carb. As far as the black plugs, take the front bowl off of the carb and see if it is wet from fuel on the vacuum side of the power valve on the inside face of the metering body. If so, the power valve is ruptured and needs to be replaced.

Sal

07-06-2021, 09:40 PM	#2
scicala Senior Member Join Date: Jun 2010 Location: Detroit suburb, MI Posts: 3,710	Re: Holley 390 CFM Accelerator Pump You want the accel pump diaphragm for 30 cc. The 50cc diaphragm is too tall for your carb. As far as the black plugs, take the front bowl off of the carb and see if it is wet from fuel on the vacuum side of the power valve on the inside face of the metering body. If so, the power valve is ruptured and needs to be replaced. Sal