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Q:I have a 1999 Chevrolet Silverado 1500 LS 4.8 8 cyl. Would a Fuel Pressure Regulator Cause This Vehicle Not To Start Properly? What is the normal Lifespan of a Fuel Pressure Regulator? Seems to me that the 1 that is on my vehicle now is losing pressure.
A:Hi Cj! Sounds like lots of guessing. A trouble code will guide you to a solution. Fuel pressure regulators should last the life of the vehicle unless they are contaminated by dirty fuel or possibly the wrong fuel such as excessive alcohol in the mix. My first suggestion is to check trouble codes, both current and pending. Next up is to check fuel pressure with a gauge. The specification for this vehicle is 55-62 key on engine off. If the fuel pressure drops quickly when the pump turns off look at the fuel pressure regulator vacuum line. If the pressure regulator is leaking it will be leaking into the vacuum line. The vacuum line should be dry and not smell of fuel. If the pump cannot create 55-62 then you need to check the pump and filter for issues. It is possible a MAP or MAF has failed, but not without setting a trouble code. Trust the on board computers ability to test monitor itself.
Q:What psi is this rated for?
A:Happy to answer your question Gearhead! This Fuel Pressure Regulator is rated at 50PSI.
A:I'm happy to help, Gearhead! This Wells Vehicle Electronics Fuel Pressure Regulator (Part No. PR121) is engineered to fit multiple GM V8 engines in vehicles from 1996-2005 and has an operating pressure of 50 psi.