Good question? I don't have the fitting(s) needed to hook up into the fuel line, and check the pressure at the rail.
If the pressure regulator is not working, that would release too much pressure back to the fuel tank, and create a lean condition under load. (Good call to rule that out before I do anything else.)
Guess It's time I have the pressure checked, or buy the fittings/gauge, and check it myself.
Is it pretty common that the fuel pressure regulator fails on this vehicle? I've never seen one fail on any vehicle, they are pretty simple devices, just a diaphram and spring that regulates the pressure. (I've even seen ways to raise fuel pressure, by crushing the stock Toyota units, on turbo cars. **Using a vice, and socket, you crush the metal housing, compressing the spring more, and raising the base fuel pressure.**)
There are no leaks at the rail, or pressure regulator. And all the vac lines are hooked up at the regulator too, but I'll check the hoses again.
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