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 Post Posted: Mon May 21, 2012 8:57 pm 

Joined: Tue Apr 01, 2008 10:56 pm
Posts: 110
Location: Kilgore Tx [North East Tx]

With my APD belt drive fuel pump and bypass regulator the idle fuel pressure "bounces" between 1 - 3 pounds at about 1200 RPM. Increasing RPM to about 1800 - 2000 results in steady, as set pressure. Will a smaller idle jet in the regulator steady the low RPM pressure?

Larry Woodfin, builder of Kinetic Art.

 Post Posted: Mon May 21, 2012 10:01 pm 
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Joined: Tue Apr 18, 2006 6:38 am
Posts: 11632
Location: Coming At Ya!
I don't run a bypass regulator but I do run a belt drive setup and my fuel pressure will fluctuate at idle also in the 2psig range +/-. You have to understand that fuel delivery/pressure in a belt drive system is RPM dependent and RPM at idle is NOT constant. As long as the down track fuel pressure is OK I wouldn't concern myself with what it's doing at idle as long as there's enough delivery to keep the fuel bowls full.

Big Boyz Toyz!


Necessity is the plea for every infringement of human freedom. It is the argument of tyrants; it is the creed of slaves.

William Pitt, British Prime-Minister (1759-1806)

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