Originally Posted by
SRT6 Gang Member
Increasing the fuel pressure is one way to increase fuel volume, I agree that increasing fuel pressure is not needed, which is why I didn't do it. While not reflected in my original post, my cliff notes were drafted over 2yrs ago but reflect what you are stating now.
Understood, however my boost exceeds that 2-4 lbs above stock levels, which is why I went with the SL55 Fuel Pump. Not even that is enough to correct the volume issue alone when pushing 20+ lbs or 5-6 lbs above stock levels. In comes the injectors and problem solved.
Correct but the stock fuel filter/ regulator is replaced when adding an ADJ F/P Regulator. That was one of the conventional ways of thinking during those times.
Ok I see we are on the same page. I was just trying to clarify as not everyone that reads the boards has a deep understanging of the fuel system on this platform. I personally like the walbro pump over the sl55, it is capable of slightly higher volumes.
I'm still not sold in having to add an external regulator, as the fuel volume is regulated by fuel line diamater. The factory fuel line diamater is capible of flowing more liters per minute than this engine could ever use. Adding more pressure to increase volume is not a good idea, keep in mind that injectors are designed to operate at certain pressures, increasing those pressures only leads to bad things. A pump that is capable of maintaining 55ish psi is the most important thing, for this to happen a high volume pump is needed. Any extra fuel that is not used will be returned back to the tank via the filter. To summarize: First try a high volume, high pressure pump, if that doesn't solve the problem then increase injector size. Agreed?