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buzzinhalfdozen · 11-01-2015, 05:22 PM

Bob, does your return have a dip hose inside the tank so it's putting the fuel in below the fuel level? Personally if you were getting air in the system I would think you would be able to hear the pump surging and you would see pressure fluctuations. Have you ever looked in the tank with pump running to see if it looks like the fuel is being aerated? When you say it starts to go lean, does it go a full number or just a few points lean and if your bring it back below 4500 does the AFR come back to normal?

11-01-2015, 05:22 PM	#27
buzzinhalfdozen Senior Member Join Date: Sep 2006 Location: Bellevue Ohio Posts: 984 Likes: 0 Liked 11 Times in 8 Posts	Re: starts breaking up at 4500 rpm. Bob, does your return have a dip hose inside the tank so it's putting the fuel in below the fuel level? Personally if you were getting air in the system I would think you would be able to hear the pump surging and you would see pressure fluctuations. Have you ever looked in the tank with pump running to see if it looks like the fuel is being aerated? When you say it starts to go lean, does it go a full number or just a few points lean and if your bring it back below 4500 does the AFR come back to normal? __________________ Joe Buchanan SS/BX 3117