Fuel Pressure Relief Valve - WHAT YOU NEED TO KNOW!

The fuel pressure relief valve - also known as the fuel pressure regulator on a common rail diesel engine - can become a weak link on a performance-tuned Duramax or Cummins.

The valve dissipates fuel pressure to prevent overloading the fuel system. After some time, the valve weakens and may drop fuel pressure when it's not needed and cause a host of problems. A weak valve can trigger engine codes P0087 or P1093. It may also be responsible for excessive smoke, poor driveability, poor mileage and a loss of power.

In this video, Duramaxtuner's Scott Henricks and Nick Priegnitz talk about the benefits of the aftermarket replacement valve. The cost is minimal compared to what a faulty valve can do to the performance and driveability of your diesel vehicle.

Calibrated Power Solutions Inc. is a data-driven, market leading tuning business. We are dedicated to providing high-quality engine calibrations that represent the best mix of drivability, reliability, and power available within the performance automotive aftermarket. We keep our edge by encouraging innovation. We drive and verify results by employing expert staff, who are equipped with the best tools in the business. We view ourselves as prompt, reliable professionals who deliver. CPS aims to establish a nationally recognized standard in our market for product quality and service delivery.

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[saltysteel]

Used a regular 18mm Craftsman wrench. Used the boxed end on the wrench. Tapped on the open end of the wrench with a brass hammer.
Tap tap tap until it came loose.
Installed plug same way. Tightened by hand as much as I could, then tapped it over a quarter turn with the brass hammer.

[darknitelmm]

Put this on my 07.5 LMM holy crap this made a big difference in how my truck ran!!! It even shifter better!!! I did however crack a rib getting it loose so I believe Sasquatch put mine on! 😂 but I’m good now

[markh.]

I just replaced this valve in my '07 LBZ at 114, 000 miles and before the codes had a chance to appear - preventative maintenance pays... Thanks!

[stevewaclo]

Good video! I know an even smaller part that can cause grief, the injector check ball! 😄

[thegingerbeardman]

I had a 6.7 Cummins in the shop that ran away on the owner from oil in the intercooler after he replaced his failed turbo. He had installed a rail plug at the same time. Turned key off, Injectors turned off but engine running at 5-6k rpm and no where for the fuel pressure to go. Yeah bad combo, blew the pintle out of the ends of 4 injectors and cracked the tip of the other two nozzles!

I install these plugs and believe they are safe 90% of the time but beware that if your truck engine were to run away and the injectors are off they will be destroyed and so will your cylinders.

I have seen and heard of lots of engines having run away following turbo failures when the intercooler doesn’t get cleaned/drained/replaced. (Not under my care). Generally they shut back down after a minute or so and the engine survives. Point is in the case of my one customer the factory relief valve would have been the difference between a 60k mile motor living on instead of catastrophic failure.

[ivanlavrishin]

I have a cummins 6.7 and had this issue on my truck. Took it to a mechanic here and told him that I don't have power when towing my 5th wheel and check engine light comes on. When driving without my trailer the light disappears after a while and i can go 70-80 mph. Hook up my trailer i can't go faster then 50-60 mph. He counted figurer out what was wrong. After watching this video i decided to pay the $40 with shipping and order this and replace it. Its been 2 weeks now and I'm hauling my trailer with no problem and its running well. Thanks guys.

[lukefarmer]

Yep, used one on my cummins and blew the top off one of my injectors.filled the motor with fuel. I was towing at night and in the rain and never knew it happened until my idiot light was going off and I looked and had no oil pressure. The oil was floating on the fuel and blew out the breather. Good thing, no hydro lock and motor is still ok. Reinstalled stock valve. Be aware. They are there for a reason!

[ADrunkenFish]

so my question is i drive my truck daily and mine just did this so i parked it and i believe this is the issue but if i put one without the release valve like yours don't i risk my injectors getting over pressured and blowing up? also does my fuel economy go down because it blocks the extra fuel going back to the tank or does it not block that?

[zackk]

What are the symptoms when this goes bad? I heard a drop in fuel pressure but then that would mean the injectors aren’t getting enough fuel so I would imagine the motor would sound blown. It’s pressure relief so does it relieve fuel, air or both? Why no oring? I’m thinking just an Oring so why not go with a new oring? .20c part

[duanedevalkeneer]

You don't show where and how to replace on a LB7, 2002.
Please do ASAP, thanks.
Duane

[zackk]

I have an LLY with 8, 000 on the motor. No mods except a RDS 64mm turbo. New engine throughout. My issue is that the fuel rail pressure is all over the place and sounds like a blown engine. It started 2 months ago and sounded like an injector knock but got much better when running above 180 degrees. Now it does this all the time. 3 shops have had it and no answers. I don’t recall it even throwing a code at all. Engine still running horrible and can’t drive it. Any advise would be great

[Greengulchleaves]

"$50 part" meanwhile on a 24 valve it's a $300 part and does the same exact thing...I love my Cummins and all, but sometimes man

[Fabian-kuvi]

I have a 2015 6.7 Cummins, do you need to release any fuel pressure from the rail before removing stock plug?

[redneckoriental]

"The fuel pressure relief valve - also known as the fuel pressure regulator..." A fuel pressure relief valve is not the same as a fuel pressure regulator.

[robertgraham]

2002 lb7, is that the same fuel pressure relief valve? Is it in the same location?
Thank you

[romellarches]

These parts got me a headache, and my CRDI engine always gets hard starting 4 to 5 cranks before it starts, these tiny parts is very important on common rail diesel engine.

[dustingillard]

Lots of questions about LMLs
I have 2015, same problem, but cant find any videos
It's on the front of rail drivers side
The back port is a sensor, the front is valve
I cant find anything on how to get in there, may have to take EGR off

[juancabello]

Will having the stock plug on have to do with my ac compressor shutting off I have a early 04 lb7 and I realized every time I step on it my compressor shuts off.

[ramironajera]

why my 2015 chevy silverado 6.6 only gets 1200 psi on fuel rail sensor and wont start in till i spray starting fluid in

[NUPE]

Hey Guys, I have a 2006 Duramax LBZ motor with a bad fuel issue. I can drive down the road and the engine will just cut off. It’s like the fuel pump loses signal and the engine will just stop running. I put it in park, turn the key off and restart the truck and its like it never happen until it does it again??? Lately I have been getting a 0088 code fuel rail too much pressure code and I will clear it and it goes away for a while, but it resurfaces. Can you let me know what the problem is?? Could it be the sensor in this segment??? I want to know before I have to take it to the dealership and pay an arm and a leg!!! Thanks!!!