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<blockquote data-quote="MalcolmV8" data-source="post: 15806822" data-attributes="member: 8854"><p>A returnless system speeds up and down the pumps to maintain pressure. Doesn't really matter if the fuel solenoid opens up on the line in front of the rail or on the rail itself. Either way there was a sudden lost of pressure while the pumps spin up to bring that pressure back in check.</p><p></p><p>On a return style system the pumps are running full power 100% of the time with the regulator controlling pressure so when the fuel solenoid opens the regulator can compensate dang near instantly because it already has full fuel pressure behind it to work with. There's no waiting for a pump to spin up faster to create the needed extra fuel/pressure. </p><p></p><p>On a returnless system spraying a 200 shot you might be better off with a stand alone fuel cell in trunk with its own pump and not touching the existing fuel system. Or just see how big of a lean spike you get and see if it's something acceptable.</p></blockquote><p></p>
[QUOTE="MalcolmV8, post: 15806822, member: 8854"] A returnless system speeds up and down the pumps to maintain pressure. Doesn't really matter if the fuel solenoid opens up on the line in front of the rail or on the rail itself. Either way there was a sudden lost of pressure while the pumps spin up to bring that pressure back in check. On a return style system the pumps are running full power 100% of the time with the regulator controlling pressure so when the fuel solenoid opens the regulator can compensate dang near instantly because it already has full fuel pressure behind it to work with. There's no waiting for a pump to spin up faster to create the needed extra fuel/pressure. On a returnless system spraying a 200 shot you might be better off with a stand alone fuel cell in trunk with its own pump and not touching the existing fuel system. Or just see how big of a lean spike you get and see if it's something acceptable. [/QUOTE]
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