I had a chance to get some very precise measurements on a couple of Stock TBI Fuel Pressure Regulator Springs. The spring force was measured at 15mm compressed height, which is about the maximum compressed height a stock TBI pressure regulator will allow. I don't have a clue, or even a wild guess as to what kind of fuel pressure the stock springs are capable of providing when compressed to 15 mm! The conclusion I get: more Newtons = more fuel PSI.
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