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Fuel Pressure Fluctuation

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Old Jan 27, 2008 | 08:05 AM
  #1  
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Fuel Pressure Fluctuation

Finally got a chance to screw the pressure gauge I got into my FPR. When I started it up the needle jumped back and forth between about 40 and 80 PSI at idel. Is it normal for it to jump back and forth like that? Got a new fule pump. Was thinking when the tappet is pushed up by the cam the pressure will rise and then drop when it comes down. Havent had a chance to get somone to step on the gas so I can see what the gauge dose at higher RPM. Shouldnt the pressure stay even with rpm?
 

Last edited by scatgo; Jan 27, 2008 at 08:08 AM.
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Old Jan 27, 2008 | 08:17 AM
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From: Levittown
Yes it will flutter with a mechanical fuel pump.

Bill
 
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Old Jan 27, 2008 | 09:18 AM
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it will get a little better at roughly 1000-1500 rpm but it will never be smooth as an electric pump is.
 
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Old Jan 27, 2008 | 11:22 AM
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Ditto the above. A liquid filled gauge will dampen some of the fluctuations.
 
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