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Fuel pressure with belt drive pump
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DRR Trophy
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I have a belt drive pump with alky carb and bypass return regulator and want to know if the wide open pressure can be checked other than going down track.


PMWLLC
 
Posts: 7 | Location: At the track | Registered: December 23, 2016Reply With QuoteReport This Post
DRR Sportsman
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My belt pump is at full pressure on the chip at 4400


Denis LeBlanc

 
Posts: 468 | Location: Manchester, NH | Registered: February 03, 2006Reply With QuoteReport This Post
DRR Trophy
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Thanks


PMWLLC
 
Posts: 7 | Location: At the track | Registered: December 23, 2016Reply With QuoteReport This Post
DRR / Crew
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It's my thought that a return style regulator should keep the pressure the same (approximately) no matter what the RPM. That is as long as the return line is big enough to bleed off the excess fuel required to keep the pressure at the desired setting. That is why most High Volume systems like the Aeromotive states specifically to use a #10 return.
 
Posts: 2103 | Location: Gallatin, TN - U.S.A. | Registered: October 12, 2009Reply With QuoteReport This Post
DRR Sportsman
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quote:
Originally posted by DragRaceResults:
It's my thought that a return style regulator should keep the pressure the same (approximately) no matter what the RPM. That is as long as the return line is big enough to bleed off the excess fuel required to keep the pressure at the desired setting. That is why most High Volume systems like the Aeromotive states specifically to use a #10 return.


That's true with a constant flow system with an electric pump. A belt drive pumps output increases with rpm, so does pressure. (usually) The poppet (or diaphragm) sets the idle pressure. A jet is used to control (increase) the pressure at higher rpm. This is useful with alky carbs.


I used to be a people person, but people ruined that.
 
Posts: 225 | Location: Usually home | Registered: January 27, 2013Reply With QuoteReport This Post
DRR / Crew
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That makes sense. I know ours increases about a pound on the run.
 
Posts: 2103 | Location: Gallatin, TN - U.S.A. | Registered: October 12, 2009Reply With QuoteReport This Post
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