LT-1 issue

Alan Roehrich · 04-12-2015, 03:32 PM

The check valve retains fuel pressure after the pump is turned off. For example, a stock or stock replacement pump will usually retain 90% or so pressure for several minutes. If your pump retained a significant amount of pressure last year, for a significant period of time, and this year it bleeds off a substantial amount of pressure fairly quickly, then something significant has changed. Since that change is accompanied by a performance/driveability problem, that is where you should look first.

I would think, and I may be wrong, that 45 psi is a little low. It would seem to me that you'd want to run closer to 55-60 psi if you can build that much pressure, and use a shorter duty cycle on the injector to maintain the A/F ratio the engine likes.

04-12-2015, 03:32 PM	#11
Alan Roehrich Veteran Member Join Date: May 2006 Location: Murfreesboro TN Posts: 5,113 Likes: 1,571 Liked 1,821 Times in 413 Posts	Re: LT-1 issue The check valve retains fuel pressure after the pump is turned off. For example, a stock or stock replacement pump will usually retain 90% or so pressure for several minutes. If your pump retained a significant amount of pressure last year, for a significant period of time, and this year it bleeds off a substantial amount of pressure fairly quickly, then something significant has changed. Since that change is accompanied by a performance/driveability problem, that is where you should look first. I would think, and I may be wrong, that 45 psi is a little low. It would seem to me that you'd want to run closer to 55-60 psi if you can build that much pressure, and use a shorter duty cycle on the injector to maintain the A/F ratio the engine likes. __________________ Alan Roehrich 212A G/S