88 TBI factory fuel lines - what portion can withstand high pressure?

[df2x4]

Where are you finding ptfe?

Several companies sell PTFE lined hose for AN fittings, Russell PowerFlex as an example.

http://www.russellperformance.com/mc/hose/powerflex.shtml

 

[vr1967]

I’ve been using the Vortec higher pressure pumps in all my tbi trucks since the Vortec came out and have never had an issue

 

[PlayingWithTBI]

I’ve been using the Vortec higher pressure pumps in all my tbi trucks since the Vortec came out and have never had an issue

Keep in mind, if you're running the TBI system, your regulator is maintaining its set point, you're just getting higher flow with the Vortec pump.

 

[vr1967]

Keep in mind, if you're running the TBI system, your regulator is maintaining its set point, you're just getting higher flow with the Vortec pump.

I know that, but most think the pressure will be too much for the tbi system. Even the dual tank valve on the later R/V series (Pollack manufacturing) can Handle the pressure, while the earlier ones are not rated as high a pressure

The tbi pumps barely supply enough fuel for the 5.7, and is one of the reasons the 7.4 tbi has such a bad name- they are starving for fuel.

 

[Tractor joe]

Where do you get the fittings to go from the braded fuel line that screws into the tbi, to adapt to the l.s push in fuel rail? In the middle of putting a 03 suburban 5.3 in a 89c2500