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RE: 390 in Mach 1 Try This!
By Royce Peterson - 08/31/2001 8:57:26 AM; IP 152.163.204.77
It sounds like you have a fuel inlet needle/seat that is either being held open by a piece of dirt or way out of adjustment. Take the carb off the car, dump out the gas, turn it upside down and with a clean piece of fuel hose connected to the inlet blow into the carb and see if the fuel inlets are closed. If you can blow air into the carb you need to remove the bowls and check that the float upper surface is parallel with the upper bowl surface when the needle is closed. Replace the needle/ seat assemblies with Holley units if they won't close.

Installing the 4150 conversion won't help anything if the fuel won't shut off.

Royce Peterson
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Collapse <a href=../ForumFE/reply.aspx?ID=7881&Reply=7881><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor7881" onclick="return false;">390 in Mach 1</a>&nbsp;-- <font color=#0000ff>Tim, <i>08/29/2001</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=7881', contentMargin: 60, icon: $('anchor7881') }); </script>  390 in Mach 1 -- Tim, 08/29/2001
Collapse <a href=../ForumFE/reply.aspx?ID=7884&Reply=7881><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor7884" onclick="return false;">I think its simple: get a smaller carb. [n/m]</a>&nbsp;-- <font color=#0000ff>Mr F, <i>08/29/2001</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=7884', contentMargin: 60, icon: $('anchor7884') }); </script>  I think its simple: get a smaller carb. [n/m] -- Mr F, 08/29/2001
 RE: I think your right!. -- RC Moser, 08/30/2001
 Please tell us more about your car. -- Dave Shoe, 08/30/2001
 RE: 390 in Mach 1 -- Tim, 08/30/2001
 RE: 390 in Mach 1 -- Ray, 08/30/2001
Collapse <a href=../ForumFE/reply.aspx?ID=7907&Reply=7881><img src=../images/reply.png width=30 height=10></a>&nbsp;<a href="#" id="anchor7907" onclick="return false;">RE: 390 in Mach 1 (Still Trying)</a>&nbsp;-- <font color=#0000ff>Tim, <i>08/30/2001</i></font><script type="text/javascript"> new HelpBalloon({ dataURL: 'replyb.aspx?ID=7907', contentMargin: 60, icon: $('anchor7907') }); </script>  RE: 390 in Mach 1 (Still Trying) -- Tim, 08/30/2001
Collapse <b>RE: 390 in Mach 1 Try This!</b>&nbsp;-- <font color=#0000ff>Royce Peterson, <i>08/31/2001</i></font>RE: 390 in Mach 1 Try This! -- Royce Peterson, 08/31/2001
 RE: 390 in Mach 1 Try This! -- John W., 08/31/2001
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