CUMMINS LOW RAIL PRESSURE, Troubleshooting tips!

[@joshuaquilliam2887]

So nice to see a mechanic actually diagnose a problem vs throwing parts and others money at it.

[@waylenbrowning3491]

Awesome video man! A good mechanic will always check basic things first and not try to throw expensive parts in awesome job

[@horsewhispererr]

I am a mobile mechanic, and josh, you nailed it!! 90% of the time its simple stuff so I agree to always start at the basics. Excellent video to help trouble shooting.

[@horsetorquesdiesel]

Thank ya!

[@crohnsn2446]

question for both of you guys? 05 5.9 starts beautifully keeps good rail pressure but take the rpms up to 2k and let off the throttle and the revs hang and bounce on the way down. Injector pintals not seating?

[@colinlawrence2186]

Great video Josh I'm sure a lot of people will learn from it don't over think problems always check the basics As always take care stay safe and God bless 🙋🏻‍♂️🇬🇧

[@jamesmarlar696]

Great video it shows that not everything is a big issue and people need better maintenance

[@justinadickes4770]

Always awesome to get someone out thw door for the cheap and the right fix, thanks for the basic diag steps to get us going

[@justinkough8990]

Right on thank you for the knowledge drop and the reminder of the back to basics simplest/cheapest fix first process of elimination!

[@kevinpeterson9659]

This is the type of stuff everyday people want to see. Keep it up!

[@joeykane2577]

Sweet truck, great to see there's still honest mechanic's out there.

[@ericmillier6652]

I just went through the same thing on my 06. I went through the same trouble shooting steps you have described I the video. Turns out mine was the CP3. Great video and this is amazing information!

[@briangarvey4936]

As a 3rd gen owner I enjoy these issue trucks an dive into diagnoses and ultimately the fix videos. keep it up Josh. I still have no idea why your channel isn't growing faster cuz you deserve it!!! PS I love the intro on the Dyno when you try to mash the skinny pedal through the firewall!! Ha I guess that's how you get all the horsetorques out!!!!!!

[@N.A.J.]

I too am a field mechanic. Many times it's the simple issues that customers overlook. It takes a patient eye to find the simple issues. As to why his channel is not growing faster. Simple answer are the shorts. Seems the youtube algorithm caters to content creators that create those short videos. I've watched it happen to other channels I follow. Minimal growth, start creating one short a week, and subscribers follow.

[@ClarksAutoAndPerformance]

I've cut a fuel line and welded the end shut to build a cap off the rail. I use it to individually block off each injector to test and drive on five cylinders. This method will narrow down the issue 100%.

[@diesel_enduro]

Good job brother keep this type of stuff coming

[@livewoutwarning7]

Had a fuel pressure issue on my '12 a few months back, turns out the #6 connecting tube was loose. Friend had a feeling and turns out that was it. My first diesel so a crazy find to me!

[@rhegafd]

I fricken love this channel and I dont even own a diesel. Used to have a 2000 2500 Diesel Cummins. It was awesome. Blow by ended up being the reason I got rid of her. 300k miles. I wish I had gotten it rebuilt.

[@Balakay9435]

Hell Yeah Brother 🇺🇸🦅

[@Tinkerer4Life-pp2dg]

Great video. Still sorting through my long start issue on my 04.5. I put in new fuel pressure relief valve and new fuel filter. The problem still exists. Waiting on banjo bold threaded adapted to test lift pump pressure, and go from there I guess.

[@wyattbarry4786]

Learn something new in every video! Thanks again!

[@devlinking7476]

I love watching your videos you explain things well and I learn a lot from you. But I’m curious about what I can do to start to learn more about Cummins specifically. I’d love to work in a shop and gain more knowledge in these engines as I have a passion for them

[@bernhard8540]

Love these videos man it helps a lot of people that thinks some of these issues are migger things and end up chasing it for a long time spending a lot of money when its just a super simple thing. Gauges for things like fuel pressure and etc are super handy for any vehicle but especially for diesels❤❤❤ love the content as always man❤❤

[@73cjproject]

Start simple, best advice there is. Is there any decent way to test the injectors without sending them off? I have an 05 with 314k on the odometer but I bought it used with 280k and no idea how many miles are actually on them. I plan to go up in size along with some compounds and cp3 for the future but don't want to wait too long and wash out a cylinder with a stuck injector. The truck runs great but want to make sure I don't miss the signs of a bad injector. Thanks for always bringing great content!

[@chaslittle6521]

Great video brother, keep up the good work!! I appreciate all your videos!

[@Cummintakeit]

I like that you didn’t edit out the part about the battery being too dead to start it… man that’s too real lol

[@jonathanmangan2642]

Had me laughing 😂

[@jordanparker8359]

Thanks for this video brother chasing this issue in my 6.7 going to be doing these tips

[@tylerlockler6899]

Great video as always. What are your thoughts on the 03,04 piston style vs the 04.5 to 06? Looking at getting into an early third gen 5.9.

[@horsetorquesdiesel]

Just depends on goals

[@haveawonderfulday2637]

As an owner of a 5.9(not a 3rd gen) but definitely love the info as I’m trying to learn how to take care of my truck. What kind of tool do you use to watch your numbers? Everyone keeps saying to put on an extra filter, but I have had no problem with using Baldwin/kn filters.

[@fanninrebel03]

Keep the diag videos comin. Good stuff

[@lyndonhamby7432]

Good job Josh 👍👍

[@patg3424]

I have the Edge cts monitor and it displays everything including rail pressure, lift pump pressure etc and has a built in scan tool. Good to have.

[@briangarvey4936]

Pat have you figured out how to get the actual and desired to show? I have the cts3 on my 07.5 6.7 and for some reason cant get it to show both it only shows the actual twice..

[@kwick818]

my 4th gen started doing the same damn thing tonight. Hope to god it's a fuel filter, but they've still got 73% life left. Maybe some water or something? Just got through a wicked cold snap where im from where she sat frozen for a couple weeks.

[@bcbloc02]

When you got in the 2nd time and mentioned the fuel pressure gauge I thought why didn’t you look on the test drive? Lol we all have those days😅

[@horsetorquesdiesel]

No clue! I was like oh well, roll with it

[@mbdiesel]

Like the troubleshooting videos!

[@gdc5ind]

Great video

[@horsetorquesdiesel]

Thanks!

[@darrickissinger3932]

Dude, I chased my connecting tubes not being torqued properly for a month. I would have never thought that 44 ft lbs would cause so much pain

[@slowaf12v]

Very informative video josh!!!

[@ruthlessronniethemechanic5639]

Battery's are cashed. It's amazing how fuel can create so many issues

[@aaronsowinski1617]

I know its something all cr's have in common but is there a safe way of removing the rev hang? being a 3rd gen 6 speed owner it can get annoying in between shifts or even free revving. I've looked into everything and it seems like its just leftover rail pressure. I changed my prv and still hangs... although it returns to idle slightly better.

[@horsetorquesdiesel]

Tuning will calm it down

[@ryanorr5755]

did you ever check the fuel rail relief valve? trying to find a relevant video on youtube that does this. i have a truck that will build fuel pressure, commanded, and actual match up but once you let off the pedal, the commanded drops while actual stays high until the pressure naturally releases through the injectors

[@marrag1]

I drive a 04.5 Ram 3500 around last September it started spitting black smoke out the tailpipe and wouldn’t go over 30mph and it was throwing a code P0148 so I replaced the injection pump and then it wouldn’t start anymore. Took it to a shop near me, they managed to get it to start and said I need new injectors. Brought them new injectors and they kept my truck for 2 months never installed them. Took the truck back from them and tried to install the injectors myself after watching your videos on injector installs. Installed them and my truck still won’t start. The shop told me to crack the injector lines open to bleed air out which doesn’t make sense cause it’s a common rail system. Now it’s at another shop been sitting for a month still not looked at yet. The other shop mechanic thinks it might be the ECM since I replaced the injectors, cp3, fuel rail, prv, FCA, return lines, almost everything. I replace the stock lift pump with an air dog raptor 4g over a year ago before it broke down. Any idea why it will not start after I replaced everything on the fuel system?

[@horsetorquesdiesel]

There’s a lot, if you are local bring us the truck I can fix it

[@marrag1]

@@horsetorquesdiesel unfortunately I live in Buffalo, NY. I would’ve been ecstatic to bring it to you lol.

[@hey_youtubeim_back2159]

My truck is exhibiting the same symptoms. My fuel filter is good do you think that 215,000 Mi on the factory injectors means they're bad.? Should they be replaced with that many miles on them

[@romeovilleda2504]

Don’t forget a fuel sample always

[@danielreyna4972]

Really good video!!

[@alnighter791]

I have an 2004 plenty of fuel to the cp3 replaced fca, pressure relief valve, pressure sensor and still no fuel coming out of cp3 to the rail or the return going to replace batteries bc cause of fan clutch code and low voltage code figured it would start with jump pack but didn't any ideas would be appreciated

[@amcproW]

what is a good running factory lift pump make for fuel pressure?

[@ignacioorozco5080]

hello to everyone I watching this video and I had the same issue the high pressure rail was dropping down I check everything you did and sent the injectors out to be test them and they found out 4 injectors out of the 6 injectors, I installed all injectors and now I have a problem I haven't be able to fire up again after I installed the injectors I monitoring the dired high pressure vs actual pressure and I only getting 22 psi the lift pump is fulling all the way up top off the filter housing, any tips you can give me I will really appreciate it. 😟

[@iamnoone.]

Had the same trouble after installing cat filters on my 6.7 found lift pump weak. Would pump ok on factory filter but not on cat filter. I don't want to go back with oem lift pump looking around for a good aftermarket pump. Any advice

[@jhawkins886]

Fass or airdog

[@stvnmllr]

Firepunk has the airdog 165 on sale $650

[@horsetorquesdiesel]

Airdog hands down

[@joshuaquilliam2887]

I would go Airdog, this is coming from a Fass customer. I wanted to go Airdog but they were out of stock. Customer support blows with Fass, or consider the gdp fuel boss mechanical pump.

[@frankieochoa810]

I've got a 2003 Dodge ram 2500 5.9 Cummins, just pulled tank and replaced the fuel pump, cleaned a little debris out of tank, replace fuel filter, still won't start, little shot of starting fluid starts right up and runs good, truck starts and runs fine after initial starting fluid starts, let truck sit for about 30 minutes and it won't start back up unless I hit it with a shot of starting fluid, I've been told injectors and possibly CP3 pump but I don't know who to trust as 2 different shops have told me different things, i'm not sure what to do next any advice would be appreciated... Thanks

[@horsetorquesdiesel]

Do a return fuel test, and test lift pump pressure

[@wheyez1]

Hey Josh, can you do something on tuners? And do you sale them in your shop?

[@JVazquez-e5x]

Awesome videos …I have a crank but no start on a 2000 5.9 24 valve any idea what to check…I checked all my fuses and good, fuel filter is good, starter is good, batteries are good …I’m kind of lost we’re else to look, any help would be very appreciated

[@horsetorquesdiesel]

Check fuel pressure would be the first place to start

[@JVazquez-e5x]

@@horsetorquesdiesel i did but nothing ….honestly I picked up a fuel injection pressure tester @ o’reilys…would that work for a diesel ?

[@stevenf.5835]

@@JVazquez-e5xdid you find what was wrong with it?

[@JVazquez-e5x]

@@stevenf.5835 yes …the fuel pump in the gas tank wasn’t getting power

[@mattcoy2817]

Can you do a fuel injector return line test to check for an individual injector problem large isx Cummins will sometimes have excessive return line flow giving it a low rail pressure code

[@horsetorquesdiesel]

Yeah I’ll cap them one at a time when I get to injectors. You can usually narrow it down on a kill test

[@mynameisprivate8763]

I need help! 05 dodge .... started cutting out wanting to die at stop or red lights. Scanned and was told had two bad injectors. Ordered 6 reman'd Bosch 3 year warranty from Thoroughbred Diesel. Installed them. Original issue no longer there. Idles fine. Under a load it runs rough like a fuel ping and smokes. Went through the injectors checking for proper alignment with new Bosch feed tubes. Truck still the same. Changed the oil right after new injectors, thought might have fuel in th oil. Now appears that may have fuel in oil again. Fairly certain I didn't over fill it. But it is over full now. I can't tell from smell if there is diesel in the oil. If anyone can help me I would be eternally grateful!

[@serhammalot01]

So if I have fuel rail hang then my lift pump is bad?

[@mystycim]

Just did a new engine an i`m trying to troubleshoot why my truck don`t want to start. New CP3, New Fass 165, new Bosch FRP Relief valve.

[@horsetorquesdiesel]

If it doesn't build enough rail it won't. Seen it be a bunch of stuff Leaking tubes Bad sensor Bad wiring Incorrect plumbing Loose cp3 nut

[@mystycim]

@@horsetorquesdiesel or a idiot like me realized I didn't install the camshaft position sensor

[@mystycim]

@horsetorquesdiesel installed the sensor for cam, replaced the crank sensor and its trying to hit off but not fully, cts3 says rail pressure is 4 to 8k range.

[@Bhain4]

Where are you located? I could use some troubleshooting help? Gladly pay you if you can diagnose what’s wrong with mine!

[@horsetorquesdiesel]

Abingdon VA

[@kobybruggman5020]

What do you mean by retro fitted? My truck has one and I cam seem to find it. What am I missing?

[@horsetorquesdiesel]

Dealer installed in tank lift pump it was a recall

[@kobybruggman5020]

@Horsetorques Diesel so would I still go with a 03-04 air dog system or would I have to switch to a later year?

[@fentonhathaway2668]

Do you have a video on torquing the tunes?

[@horsetorquesdiesel]

What?

[@fentonhathaway2668]

@@horsetorquesdiesel sorry, the tubes you were talking about. New lift pump, new relief valve, new filter, and it still, jerks, jerks, jerks under a load.

[@baconcreek609]

Good tech

[@David_Palmieri5.9]

Hey man! im building a 5.9 common rail HO g56 and i have a few questions for you! don't know how to get ahold of you on facebook so i hope you see this comment!

[@royclark6982]

Should my lift pump pressure stay at 15psi after it stops and before the engine starts running ? My falls to 0psi .

[@horsetorquesdiesel]

Eh the Enforcer destruction to date is the most expensive

[@stevenwilson2605]

Or you could have a bad fuel pressure regulator

[@Bryan-FAA-certified]

So basically it was a fuel pump

[@horsetorquesdiesel]

Yep, broken wire, no lift pump!

[@mitchvankesteren6771]

It has to be so boring for you driving stock trucks for butt diags lol

[@horsetorquesdiesel]

Honestly it’s nice, reminds me of how cool my truck is