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west coast · 10-21-2015, 03:06 PM

Are you changing pump setups between the 2 systems? Your pump my not be putting out enough flow at the higher pressure 40 and above, but put enough flow at 7 psi for a carb. I have run as fast as 11.60 with all the stock fuel lines in my car with just one size up pump. This is also a 5.0 mustang.

10-21-2015, 03:06 PM	#10
west coast Senior Member Join Date: Dec 2008 Location: Rainy Washington Posts: 604 Likes: 12 Liked 215 Times in 69 Posts	Re: starts breaking up at 4500 rpm. Are you changing pump setups between the 2 systems? Your pump my not be putting out enough flow at the higher pressure 40 and above, but put enough flow at 7 psi for a carb. I have run as fast as 11.60 with all the stock fuel lines in my car with just one size up pump. This is also a 5.0 mustang. __________________ James Boyce 6052 K/SA Stock National record holder 2015,2018,2 times in 2022,2023