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on all of my logs my low pressure fuel stays pretty close to target. i see about 60psi during normal driving. during WOT it goes to about 70psi. i see a fluctuation of 6-10psi drop at most.. Usually if you starting seeing your low side fuel pressure fall off; your high pressure is on it's way with it.
for what it's worth; i run 10psi on e70 and my low pressure keeps up without a problem; no boost a pump. however my FPCM is tuned tho. this is a stock zl1 pump only.
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