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.
How much fuel pressure does LLY Duramax have?
Use common sense safety practices when servicing any diesel system: While maximum control oil pressure on a Power Stroke can reach nearly 4,000 psi, the Duramax fuel system is pressure-relieved at a blistering 27,550 psi. Cracking a fuel line loose on a running Duramax engine could easily be fatal. Don’t go there.
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 causes low fuel rail pressure on a Duramax?
It could be a restriction or a leak on the supply line between the fuel tank and the injection pump. It could be a weak injection pump not able to increase fuel pressure up to the maximum under load. It also could be one or more injectors have high return rate.
What should the fuel rail pressure be on a Duramax?
Note that the fuel rail pressure is at 24,053 psi. As stated previously, the fuel pressure with the Ignition relay unplugged needs to be a minimum of 2500 to 3500 psi during cranking for the return rate test results to be valid.
Which is the best fuel regulator for Duramax?
Then check the FOLCONROAD Duramax Fuel Pressure Regulator . It comes with everything and much more than you need on a pressure regulator – for an excellent price. In this guide, we will go through the most common fuel pressure regulator symptoms the Duramax engine will experience.
What to do if your fuel pressure regulator goes bad?
If the fuel pressure regulator went bad, then there is nothing you can do to bring it back to life. However, what you can do it replace it with a new one. Replacing the fuel pressure regulator will fix the strong gas smell, and if you’re constantly losing gas, getting a new fuel pressure regulator will fix that issue.
What causes black smoke in a Duramax engine?
The engine will increase the fuel pressure, which causes the fuel pressure regulator to produce more fuel inside than the engine needs. While it is true that black smoke could be another problem, most of the time, it is a faulty fuel pressure regulator causing the smoke.
Why does my fuel pressure regulator smell like gas?
So, when the vehicle burns too much fuel, it causes an annoying and undesirable smell of gasoline. If you pop the hood of the car, you will notice that there is gas on the rim of the fuel pressure regulator. That is a clear sign that the fuel pressure regulator is broken.