z2go Posted April 12, 2010 Share Posted April 12, 2010 After much research, I'm at a crossroad, and wanted to check with anyone who has done the V8 setup before. I'm planning on running 3/8" hard line as the feed line, and 5/16"(stock feed) as the return, with a 12psi mallory comp 140 electric fuel pump and bypass regulator to dial in the pressure at the carb. My concern is, will having a slightly smaller return line cause premature wear on a 12 psi pump if I'm dialing it down to 6 or7psi? If so, should I just go with the Mallory 110, which is set at 7 psi? I am concerned that the carb might starve if the pump isn't able to pump slightly more than is needed. For reference, planned setup is SBC 350 mild build 300-350hp. Quote Link to comment Share on other sites More sharing options...
JMortensen Posted April 13, 2010 Share Posted April 13, 2010 I was just asking similar questions the other day and was told that if I was going to get a larger pump and use a bypass regulator to be sure to make the return line very big so that there was no restriction there. I am using -6 lines and was told the return should be -8 or -10. I have no actual experience, but that is the advice I was given... Quote Link to comment Share on other sites More sharing options...
z2go Posted April 14, 2010 Author Share Posted April 14, 2010 I was just asking similar questions the other day and was told that if I was going to get a larger pump and use a bypass regulator to be sure to make the return line very big so that there was no restriction there. I am using -6 lines and was told the return should be -8 or -10. I have no actual experience, but that is the advice I was given... I read your thread also Jon, I got that impression, but it seemed no one had a proven setup, either way... Quote Link to comment Share on other sites More sharing options...
JMortensen Posted April 14, 2010 Share Posted April 14, 2010 http://forums.corner-carvers.com/showthread.php?t=43104 Quote Link to comment Share on other sites More sharing options...
z2go Posted April 14, 2010 Author Share Posted April 14, 2010 http://forums.corner-carvers.com/showthread.php?t=43104 Thanks Jon, that helps Quote Link to comment Share on other sites More sharing options...
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