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Kingtal0n · 10-19-2018, 04:04 PM

all it takes is 10 seconds google search

What do you think holds fuel pressure in the rail when you key off, magic?

add an external check valve is a thing
https://www.highflowfuel.com/i-23904...fuel-pump.html

walbro pump
" The normal 255 has a check valve. the high PRessure 255 which is what you need for LSx returnless fuel systems, does NOT have it. Thus, pressure bleeds off if the pump is not running."
https://www.ls1gto.com/forums/archiv.../t-323614.html

" The pump's outlet nipple has a retainer on the end of it that holds the check valve in the end of the pump."
https://autoperformanceengineering.c...tall_tips.html

"Traced it to bad check valve in the new fuel pump I installed. Mechanic verified as well that my loss of fuel pressure is because of the bad check valve."
https://z31performance.com/forum/z31...5-hp-fuel-pump

seriously lrn2internet before you make bold assumptions. All factory fuel pumps incorporate check valve as far as I know to aid in cold/re-starts.

You can run whatever fuel pressure you want (25-100psi) as long as you can tune for it properly. I run an aeromotive stealth 750hp capable pump at 33psi around town to keep stress (P/A) off the fuel system components.

10-19-2018, 04:04 PM	#11
Kingtal0n Post Whore! Join Date: Jul 2005 Location: South Florida Age: 42 Posts: 4,829 Trader Rating: (17)	all it takes is 10 seconds google search What do you think holds fuel pressure in the rail when you key off, magic? add an external check valve is a thing https://www.highflowfuel.com/i-23904...fuel-pump.html walbro pump " The normal 255 has a check valve. the high PRessure 255 which is what you need for LSx returnless fuel systems, does NOT have it. Thus, pressure bleeds off if the pump is not running." https://www.ls1gto.com/forums/archiv.../t-323614.html " The pump's outlet nipple has a retainer on the end of it that holds the check valve in the end of the pump." https://autoperformanceengineering.c...tall_tips.html "Traced it to bad check valve in the new fuel pump I installed. Mechanic verified as well that my loss of fuel pressure is because of the bad check valve." https://z31performance.com/forum/z31...5-hp-fuel-pump seriously lrn2internet before you make bold assumptions. All factory fuel pumps incorporate check valve as far as I know to aid in cold/re-starts. You can run whatever fuel pressure you want (25-100psi) as long as you can tune for it properly. I run an aeromotive stealth 750hp capable pump at 33psi around town to keep stress (P/A) off the fuel system components.