The regulator's job is to keep the pressure in the fuel system at a constant psi. Your Toyota fuel pressure regulator controls the amount and speed at which fuel is used by your vehicle. A faulty fuel pressure regulator can cause poor fuel mileage, rough running engine or starting problems. This is a simple way to keep your fuel system running right. Weber carbs work best in the
2.5-3psi range. If you're running the Weber electric fuel pump P/N:1035046 you need this regulator. If your application is a boosted blow thru carburetor setup, use P/N: 1035059
Factory fuel line from mechanical pump is roughly 1/16" smaller than WeberRegulator/Carb fuel line. Slight pressure is all that is needed to fit the smaller line.
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