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Re: Toyota V6 fuel pressure amount
The fuel pressure regulator is on the driver side fuel rail, close to the back of the engine. You need to pull the intake plenum off to access the pressure regulator.
The normal operating fuel pressure is 38 to 44 PSI
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relieve fuel system pressure. on the v6, detach the fuel return line from the fuel pressure regulator. remove the mounting fasteners, and detach fuel regulator from rail. on the v6 install the fuel return line before tightening the regulator mounting screws. otherwise a leak could develop. be sure to replace all O-ring seals, and coat them with a lite coat of oil. have a good one !!
With fuel pressure gauge hook up, check reading, then disconnect vacuum hose from fuel pressure regulator, regulator sit on injector fuel rail, fuel pressure should go up, if it don't fuel pressure regulator stuck close, and not letting fuel back into fuel tank, hope this was very helpful.
The fuel pressure regulator is located under the upper intake plenumn. (The black plastic cover that sits on top of the intake manifold)
After removing this upper intake, the regulator will be on the back side of the fuel injector inlet housing.
To me,it sounds more like a coolant sensor,or a idle air control valve.But unless further testing is done,it is hard to tell,check the fuel pressure,to see if it is good,at all times.Check to see if it is firing when it goes to shut off.If you are convenced it is in the fuel,try a additive called Lucas fuel treament,it is a good cleaner for injectors,and fuel pressure regulators,also,use the additive called,Heet,to dry any moister from the fuel.Water in the fuel will cause this also.
Just a guess but if you don't have an igniton problem, it may be a bad fuel pressure regulator. If the regulator diaphram fails, the engine will pull raw fuel through the vacuum line that goes to it. Also if it fails to bypass, excessive fuel pressure will flood the engine. Check the rail pressure to spec.
Y251: Pressure (PSI) is measured at cold start injector with pressure regulator vacuum disconnected. Y252: Pressure (PSI) is measured at cold start injector with pressure regulator vacuum connected.