The location of the FPRV is located on the fuel junction block in the middle of the valley underneath the metal turbo inlet. The easiest way to get to is it by removing the AC compressor, Thermostat housing and Turbo inlet and you will have a good view of the FPRV.
Where is the fuel pressure relief valve?
The Fuel Pressure Relief Valve (PRV) on heavy equipment and generators is usually found on the high-pressure pump or on the common rail. This pressure relief valve is responsible for regulating the fuel pressure in the fuel rail.
How do I know if my fuel pressure regulator is bad on my Duramax?
Common Duramax Fuel Pressure Regulator Problems
- Black Smoke. As we’ve said before, one of the most common problems that fuel pressure regulator experience is black smoke.
- Strong gas smell.
- Hesitation on the gas pedal.
- A decrease in power acceleration.
What should fuel rail pressure be on LMM Duramax?
The pressure should never go below 3,000 psi; if it does, something is wrong.
What are the signs of a bad fuel regulator?
Symptoms Of A Bad Fuel Regulator
- Engine misfires/poor acceleration.
- Black smoke coming from the exhaust.
- Spark plugs appear black.
- Reduced fuel mileage.
- Gasoline in the vacuum hose.
- Engine backfires.
- Engine won’t crank.
- Excessive fuel pump noise.
Can a bad fuel pressure regulator cause limp mode?
The symptoms of a bad regulator usually manifest as a surge when idling, though sometimes the surge can happen at speed while driving. Other symptoms include power loss on acceleration or hard starting. Sometimes it can get bad enough to force the truck into limp mode with a low rail pressure warning.
What are symptoms of a bad fuel pressure regulator?
A faulty fuel pressure regulator may cause the vehicle to experience misfires, a reduction in power and acceleration, and a drop in fuel efficiency. These symptoms can also be caused by a wide variety of other issues so having the vehicle properly diagnosed is highly recommended.
