Extreme ATV Enthusiast
Join Date: Mar 2011
Location: Shenandoah Valley,Virginia
I believe initial pump cycle is timed and not pressure dependent. After efi senses rpm and pump is turned back on, it stays on and any fuel beyond what is needed to maintain the specified fuel pressure is dumped back into the tank by the regulator. This is why a weak regulator may cause a failure to build initial pressure.
2007 Sportsman 800
1500 miles, mostly at Hatfield-McCoy trails, WVa.
Last edited by WalterS; 07-13-2014 at 05:33 AM.