retired 65 wrote:

I'm confused.  I thought a stock vented gas cap was made to relieve pressure out whenever the pressure reached 3psi due to heat build up in the tank.  I have my return line from the FiTech system into the fuel filler neck and the supply line out of the stock fuel sender line and haven't had any problem.  Am I missing something?  thanks  Jerry
 

You might be right, Jerry, butt (TS&T) I'm am just relating my experience.  I now have a vent line that runs into a charcoal canister and have had zero problems with pressure buildup in the tank.   One thing that might be making a difference is the FI Tech system.  The Ford system is constantly circulating fuel through the fuel rails which picks up a lot of heat.  If your system has a pressure regulation system that doesn't circulate the fuel that could be the difference.

BB

EFI update , This has taken me longer than I thought. Pump and tank are in all fuel lines complete tested pump today .The pump is a Hyper fuel intank , and it is fairly quiet no leaks set regulator to fifty eight PSI ,next step first start. 

TKOPerformance wrote:

Was 58 psi the manufacturer's recommendation?  Just seems high because most OEM systems with which I'm familiar operate in the 38-43 psi range. 

My FiTech fuel pump runs 58psi.
 

TKOPerformance wrote:

It seems some Edelbrock systems are regulated at 58-60psi, others at 43-45.  It changes the pulsewidth parameters for the tune, as it alters the fuel delivered for a given pulsewidth of a given sized injector.  I'd double check to be sure its right to avoid ovefueling at initial start up. 

If you are talking to me.  FiTech said that 58psi is perfect.
 

If the engine can use the fuel, then yes.  Max HP is limited by max fueling available.  At a given injector size and fuel pressure there is only so much fuel available, factoring in A/F ratio you can fairly easily determine how much power it can support.  Its not really any different than figuring how much power can be supported by port or intake flow.