2004 Tahoe Flex Fuel TBSS intake
 

Ok, please don't blast me if this is a simple NOOB question, but I can't seem to find my answer.

I have both a 2003 and 2004 Tahoe flex fuel L59 originally; now the 2003 has a LQ9 and the 2004 has a LS6. All research shows they both have return style fuel system, 48 to 52 psi. I am looking to do the NNBS/TBSS intake on each, and obviously will have to look into the corvette filter that send the return back to system and only 1 line to the non-return intake rails. These filters regulate at 58 psi.

Anyone have ideas on how well the flex fuel pumps does running 58 psi? Any other issues I will run into? Any help or insight is greatly appreciated.

Return style is still 55-62 PSI so you'll be fine.

A normal return style is 55-62. The flex fuel return style is lower, 48-52. My 2 are flex fuel, 48-52 return style; completely different fuel pump too.

Will I still be ok?

Also, thank you for your answer! I am just clarifying, as I am trying not to mess my junk up too much!

Ah I misunderstood what you were trying to say. Anyway it should be alright since the pump will just compensate for the higher pressure.

I suggest monitoring fuel pressure upon install anyway and then if it doesn't work then just mod the bucket and install a walbro

I guess a simpler way:
Will it hurt my flex fuel pump to try to run at 58 psi when factory is 48-52psi?

I edited my answer but no it should not, someone correct me if I'm wrong here but the fuel pump should compensate for the higher PSI required but I would consider monitoring FP anyway.

I would install your intake and filter and worst comes to worst you install a walbro

I hate corvette filter regulators.

Shakenfake, I am hoping to keep the oem fuel pump, as many last a long time, and the oem flex fuel pump will flow plenty for my puny setups, from what I seen. I may get the ls6 up to maybe 450hp one day, maybe a tad more, but I don't plan to push it; its bone stock right now, and may get LTs, a cam, and ported heads. The LQ4 Tahoe may never even see 400hp; it too is a bone stock engine, but it will likely get the same treatment but stock 243 heads. I just am hoping to not need an aftermarket fuel pump; but you gotta do what it takes sometimes

FFDP, why the hate for the corvette regulator filter? And what would you suggest?

They are terrible when using pumps that are somewhat powerful. They will not keep the pressure where you want it.

Aftermarket regulators are the best things to use, you can set the fuel pressure right there and so long as the pump is working as designed it will stay at that pressure.