I’m waiting on my new FPR to come in the mail, so I’m trying to do as much research about it before it gets here. Thank you for this video. Side note, I laughed when you said “maybe you let it sit for two years and the fuel went bad inside the regulator”. That’s exactly what I’m trying to remedy at the moment 😂

Most diesel truck owners in TX sounds like they all have ones and they're all proud to showcase their rigs. Semis???? Drivers could care less and let it run all night while they're snoring inside the cabin.

Thanks for the info

I have an LMM and I have the complete opposite happening, when applying throttle my fuel rail pressure will drop from desired and usually level out around 2000 psi. Usually this causes a p0087 but sometimes if you give it more throttle it will go jump back up to desired rail pressure. I'm suspecting the regulator wanting to slide into a low flow position or like you mentioned in the video it's just not sliding smoothly and occasionally gets stuck.

If you have a scanner such as a Snap On Verus edge one indication of a bad F.R.P. Reg. is at idle having aprox. 63% f.r.p. demand instead of about 26%. Also the engine will stumble a split second when you start it, and your desired f.r.p. is about 5,800, and actual f.r.p. is about 9,500 at idle. And there is a chance that you will be limited to 2,000 R.P.M. I believe that if you put a new Fuel Rail Pressure Regulator on after 100,000 miles it is a good thing. It will increase your power, and mileage, plus burn cleaner. I have seen an Engine Control Module which was randomly not providing power thru the purple wire with a white stripe (F.R.P. Regulator Supply Voltage). I used my new Snap On 'Pass Thru Assistant' Scanner to check for updates to my E.C.M., amazingly enough there were no updates needed and the E.C.M.'s calibration was good. Two engine starts later my E.C.M. went back to working flawlessly. I believe that the LLY Engine Control Module is a high quality unit which is actually unusual in this day and age. I highly recommend NOT having a bunch of aftermarket stuff such as a remote start. At the very least inspect all the wiring very closely after the stereo shop does the install, car toys is not a place that has a lot of competent technicians. In fact maybe 5% of the stereo shops can be trusted. The manufacturers use the cheapest solder they can find, which costs us all money because of electronic failures. Lead free, and low lead solder causes problems as well. A thing called 'silver migration' can occur on your Printed Circuit (P.C.) boards. Some electronic/ radio repair shops can address silver migration issues.

Thank you Nick!

I just got a P0087 which is low fuel rail pressure. The truck idles well enough to move my Montana 5th wheel but as soon as I press on the throttle it is not happy. It’s almost that the FPR decided to stop working. When I try to drive it the Fuel Rail Pressure goes all the way down to 1.9k. I will swap out the FPR today. This all happened within 2 days. I will update this if it fixes the problem.

My 05’ Duramax sounds as off the motor is blown when it starts cold at 60 degrees or so. Popping and knocking bad. As the engine runs it runs better. After 20 mins and engine temp at 180 or more it runs smooth. We have no great mechanics in Houston and my diesel mechanic is lost

Thanks Nick --- you made that easy to understand and simple

Very informative

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Absolutely excellent video. Exactly the information I needed to understand the problem I'm having. Thank you.

Great info as always. I have a high rail pressure issue after letting the truck sit for a while. I now have a good understanding of what to check.

I can’t tell you how much this is helped me you’re great descriptions are very much appreciated. Look forward to seeing more of your videos. No one else even mentioned checking the low pressure side. I’ll do that and then probably end up replacing my FPR.

Always good info on this channel. keep the good content coming.

I have recently found this channel. I am enjoying the information and that it is presented well. Please keep the knowledge shared, it is appreciated.

Awesome info guys, you guys are better than my TAC center At GM

Another great video. I can't wait to Tune my truck in March after my warranty runs out!!!

Thank you. Clear and simple.

Nice! My duramax was doing that. Nice to know why. Thanks!