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Kegracing · 10-20-2015, 10:26 PM

Check fuel delivery first. Line out of regulator into a jug, how long to pump a gallon?
Make sure return is not putting air into pickup area?
Good voltage to pump at RPM?
Once you are sure you are getting fuel into carb, then start down other paths.

Good luck.
Ken

Stock 412

10-20-2015, 10:26 PM	#2
Kegracing Member Join Date: Jun 2002 Location: Red Oak, TX Posts: 441 Likes: 0 Liked 0 Times in 0 Posts	Re: starts breaking up at 4500 rpm. Check fuel delivery first. Line out of regulator into a jug, how long to pump a gallon? Make sure return is not putting air into pickup area? Good voltage to pump at RPM? Once you are sure you are getting fuel into carb, then start down other paths. Good luck. Ken Stock 412