ls3atomicvette

Sorry wrong wording, yes I did drop the one tank with the fuel pump, not both of them

schpenxel

Interesting for sure.

Yasei

So you didn't replace the regulator in the passenger side tank with a block-off plug. How does your siphon work?

gotjuice?

I dropped both of my tanks to install the block off plugs. Still use the factory pump for normal driving. Then under boost, the Magnafuel pump kicks in, I also have the pump hard wired so I can turn it on at any time. A led light kicks on to tell me the extra pump is working. I have had no issues. It is not that bad to remove the tanks without removing the rear drivetrain, but I have done a bunch of them.

Unreal

If you want to run <50ish FP then you need to drop both tanks for siphon the work. If you are going to run high base pressure then it will work without plugging the passenger tank.

realcanuk

Yup. Haven't dropped my tanks to install blockoffs yet. With 58 PSI base pressure I have no issues.

ls3atomicvette

Yes exactly

Unreal

I have both of mine blocked, because dropping passenger side is cake when tranny and drivers side is out.

GS_DAN

The advantage of running lower base pressure so that the fuel pump/injectors don't have to work so hard at WOT?

ex. 50lbs base pressure + 20lbs boost, only need 70lbs effective fuel pressure vs 78lbs at 58lbs base pressure.

schpenxel

Fuel pump flow rates drop fast once you get into higher pressures, so you have to find the right spot where both your injectors and fuel pump can support the power you're making. Pressure too low and you need huge injectors. Pressure too high and you need a huge pump

BLOWNBLUEZ06@RKT Performance

That's correct. What I share with people is that a fuel system is truly a system and the design ends up going in circles. The fuel pump flow capability diminishes as the pressure increases and it's always a non linear flow curve up top. In the C5 sticky section, I have a spreadsheet that a fellow forum member came up with that helps you design a balanced system based on actual fuel flow at various pressures, compared to selected injectors. It also allows for multiple pumps. If your pumps aren't listed and you're able to acquire the flow data, there's a place for you to enter it. It will graph the flow curves for you to help you discover the best balance between injectors, pumps and pressure.

GS_DAN

Thank you for the responses. So if i am running say 14psi on a return-less style fuel system, secondary inline, i only have 44psi effective fuel pressure? And when your fuel pressure is that low, the fuel injectors are compensating and having to work harder?

This would clear a lot up for me.

thanks,

BLOWNBLUEZ06@RKT Performance

This is all part of that design circle.
The two considerations for lowering pressure are injector flow and fuel management between tanks. At a certain pressure, the fuel will no longer be drawn out of the passenger tank. That can be solved a few different ways. One is to change the orifice size in the venturi to match the new pressure and the other is to use electronics and a small pump to continuously push fuel to the driver tank.
Aside from that, the answer to your question is yes. In order for the same fuel to flow at a lower pressure, the injector pulse must be increased to compensate with attention given to the injector duty cycle as it increases.

schpenxel

Basically, yes.

C6vettegfw

I installed the A&A stage 2 system last year and it was straight forward. took a few hours but was quite easy. been running fine ever since. base fuel pressure is just under 60.