This is the kind of information people will pay big money for, gotta love someone doing it on KZfaq to help everyone.

Amazing! You've raised the bar on KZfaq instructional videos. Thank you.

I've been an automotive, light duty diesel technician for 27 years, plus raised up in the car business. Been doing Diesel work for the last 12 years of my career. This video Is Awesome. Very Basic and a great video. I enjoy watching People that are intelligent of this kind of work.

Absolutely superb guide to the system. So clearly and patiently explained that, even as an amateur DIY mechanic, I was able to get to grips with the information and get my head around how to approach a diagnosis of my crank-no-start problem. Useful even just to help me discuss a diagnosis with my mechanic. Real impressive. You are a natural teacher, respect.

I grew up in a Garage father ,uncle granddad all Mechanics. Sorry now were called Tech's . I remember my Dad teaching me and he always said books are good, But if you can't visualized what going on and have a good mental image of how its working . you will never understand it ! Great video !!

you are the professor bro. thank you so much for making this video. i'm a non-mechanic trying to resurrect a cummins/onan generator and this video gave me the jump start i needed

Loved your discussion of the overall workings of the system. I have a common rail 5.9 Cummins and it is now 20 plus years old; therefore, diagnostics will being be more and more important. Thank you!

Great Video! I am inexperienced with Diesels, this video is actually organized and informative while not oversimplifying stuff. Keep up the great work man!

I Dont really comment often, but just know you helped a Scania apprentice a lot. Thank You from Denmark !!

I know you'll wonder how I finished the whole video in 42 minutes ... and the answer is 1.5x speed 😁. Great video man. I even learned a few things

Wow! I feel a little less stupid knowing about diesel systems. I've watched this video twice and made plenty of notes. I reckon by the time I watch this video for the fifth time I should know something. I'm looking forward to another basic diesel education. Keep them coming. Great work Chris.

Excellent way to present the number of possibilities involved with the diesel fuel system. Enjoyed your sensibility and respect towards the art of the engine vs the vulgarian F bomb bad boy way. Classic!!!

Thank you for your very clear explanation about fuel system. Really enjoyed & appreciate it! Very professional just like you're a professor in a classroom. I am from the Philippines. Mabuhay ka!

the simplicity makes it easier for one to want to be a diesel mechanic.

Wow just got to say really great video. you covered so much here and in such a good systematic way and easy to under stand. Only two things i could add here, for a non starting diesel engine are 1 cranking speed which you covered by saying battery but also starter motors can be the problem. but some diesel engines need a minimum crank speed to start. and 2 is EGR valves, if these are stuck in open position they can stop engine starting as the air/fuel mixture is compromised/disrupted. Thanks again for the great video

Thank you so much for posting this video in such a way that I could understand and use the information. The time it took to make and the completeness in pictures and explanation is priceless. Again thank you very much for your time and help.

That's a better explanation of the system than any of the courses I have ever been on 😎

i've been looking for my perfect learning skills through any way to go but this guy's page gab my full attention (sience diagnotic is my best and easy point to learn fast as well too) thank you

Excellent work Chris!! Absolutely love your knowledge and presentation. Keep up the great work.

Incredibly well explained. Great information!

Some people act like they know what they're talking about there is no doubt that you do and that you are the man I'm so glad I found you saving me from a nightmare of bad Direction I will be subscribing

It is indeed a fantastic lectures. My coming across your lecture coinsided with having fault of starting failure with my 2010 hyumdai tucson diesel. Your lecture enable me to successfully did a lot of test. Where I am now to know whether or not my rail pressure sensor/pressure regulator are good.

Excellent presentation. Out of all the wealth of information you just shared -for me- the key to the diagnostic kingdom you mentioned is- "If your low pressure side isn't delivering sufficient pressure, the high pressure side can not make it's required pressure" (paraphrased). Jumping right into injector failure mode rather than considering first that the issue may be something as simple as an undetectable air leak, will destroy your credibility and break your business/wallet.. I replaced my OEM (piss poor and leak prone system) with a positive pressure (lift) in tank component and a primer blank out unit after 3 weeks of spanking around with every connection and potential air leak -with only 1 one possible leak point found. When you do the math-it's much cheaper to just junk the stock fuel delivery system, and upgrade to a quality USA made lift system. Final diagnostic note... This vehicle was found to have lost the CP3 lift pump capability putting it in a "no start condition". Problem was overridden via the lift pump installation. Thank you Sir.

Watched the video in full very good explanation of the total system. I can tell you are not reading from a book and got experience. Thanks, J S.

What a great presentation. Clear and concise. You sir are a great teacher!

From my experience, trucks that have primary fuel filter and a secondary fuel filter or fuel water separator never seem to have fuel related issues. As long as you change them after every pm service you’re good. It’s the trucks that only have one filter or separator that have a lot fuel system problems

Great info. I have the t1n 2005 sprinter with low rail pressure . Thanks to your video i have a better understanding of the fuel rail system and have made a list to narrow down the problem

Great vid. Thanks a heap. My diesel 4x4 is Crank no start, now I have methodology for figuring out what’s up. I suspected fuel but nice to know how and where to look / trace the flows.

What a great video passing on knowledge is the greatest gift you can give

That was a rough draft ???? Wow! Excellent video, thank you!

Very clear and very good explained, you are my best teacher ever! Greetings from Holland i and wish you hugh succes!

Science of Diagnostic KNOWLEDGEABLE Great tutorial brilliant video thank you very much helpful video Science of Diagnostic. Pauly 's Auto was right about this channel thank you Pauly 's Auto From Nick Ayivor from London England UK 🇬🇧

Best explanation ever wis I’d seen this video before I had trouble with a diesel ford mondeo UK crank but no start I ended up putting it into a garage who systematically ripped me off never got it running and I’ve been working on cars for years 😂but mention diesel’s over here and you can see £ signs in their eyes but really when you look at a diesel if it’s not running 9 out of 10 it’s the fuel thanks for the info

Thanks for making this, relatively new to diesel and working as a tech in the field this was very informative for me.

Thanks clear concise and also gives a clear understanding of what you maybe undertaking!

Great information on the Diesel Common Rail System. Very informative and well presented. Well Done Sir! Mahalo 🤙

Sincerely, Impressive presentation sir.1979 John Deere 2840 -the Gifted-WorkHorse I am now (only now, after 20+ years of use/abuse) am forced to look directly in the mouth. Suffice to say, you saved my ass - it's cold in Michigan February. It's colder without my tractor. Thanks man. Sincerely.

This video is great! I'm trying to diagnose a no start after water in my filter and my engine shut down.

You’re Absolutely articulate . Would make a great teacher. System well explained.

Awesome easy to follow lesson, I understand fuel delivery of a common rail in 53 min amazing dude!!!

Dammm!~ some people are a pleasure to learn from... somewhat rare! You are one rare gem! I have a 2010 Chevrolet 4500 mini bus/shuttle with a 2011 running train factory installed (the LGH) and it says on the sticker it is a DI(Direct Injection)... I may not have a rail type... I have no idea! I have to snoop and get more info, clues! I am but a noob! UPDATE: after snooping I now know that common rail is direct injection since quite a while back..

Great video. Lots of really good and useful information. Well explained. I haven’t bought my truck for towing an RV yet. Would like the diesel in the mountains. Not as as scared as I was. Thank you.

Perfect video. Thanks . The relief valve is also named as " pressure limiting valve" in some cases.

Thank you. Excellent and well presented information. Best wishes from UK

P0093 and I'm tracking back from the injectors, thanks for the video

Im not a car guy bit i really enjoyed this video. Cheers.

What can be the problem when it will run for 20 minutes or so, then die for a half hour?

Great video. light vehicle Diesel Diag is a big thing in Oz at the moment

Thank you, this was one of the best ive Seen and very well Potrayed, I'm new at this your information Was very easy to follow.

calidad de informacion gracias amigo saludos desde el salvador

Very informative, thank you for simplifying it .so much information out there .

Appreciate your explanation on common rail. Well Done Sir! Mahalo 🤙

This is the most informative in-depth video on diesel diag I have ever seen think you so much please keep doing what your doing. Do you have any in depth DEF, DPF, SCR diag videos?

Great video mate from Australia thanks for the lesson.

What an incredible video mate, not used to diesel engines but this has taught me LOADS! I'm having a Crank - No Start Issue with my Iveco Daily 2.8, watching this video makes me wanna go further back down the fuel system and re-check Low Pressure...which I assumed was fine, as I'm getting fuel upto the Common Rail...but maybe still not enough pressure!? Thanks man.

Thanks professor,you are great teacher

Sir you’re a great teacher ! How about teaching us onhows the flow of diesel fuel in isuzu trooper w / 4jx1 engine works . So many trooper owner may get happy if you can do that , because we’re getting too much hard in trouble shooting w/ this engine every we opem up the diesel line . Like replacing fuel filter after that we’re getting to re - start it up , so please help us ! I’m from the Philippines thanks a lot & God Bless You !

Excellent explanation of the system!

Thank you very much the best information you share. Its a big thing for me as a beginner.

Absolutely good explanation I learn a lot thanks

Great clear well presented information. Thank you

That was layman's terms BRILLIANT!!!

I'm a new Diesel truck owner, thank you very much for simplifying how the system works. I'm having issues with my truck only starting after being plugged in, if I don't plug it up over night, it will not start !!! By chance can you tell me what may be the problem ?

Muchas gracias.

Your one clever man, thank you for your advice.

great info thanks for providing the data

Excellent lecture, well explained.

Man you earned a subscription i love this

I have a Hyundai Terracan, I have changed the pressure sensor on the common rail, the pressure regulator on the fuel pump and still got a bad start problem. The car starts but wont accelerate, I have to wait till the fuel pressure builds before I can drive off. After watching your video, it's obviously the fuel pump worn out and won't hold pressure.

That's exactly why I'm here lol. I'm used to older petrol engines.

Great video and explained very well indeed, thankyou

Very interesting, like to learn more

Great video Chris. As always I appreciate your thorough attention to detail. I didn't know you were CAT certified. Were you more on the truck side of things or did you do off-highway? Looking forward to the next part! -Z-

Damn where is this guy at? I need him to diagnose my no start issue

Hi. I have a CP1 high pressure pump on 2.8 hdi jtd pickup. To get it started I have to loosen the top head which carries the fuel cut off sensor then tighten it up after turning on ignition.

Awesome Video and illustrates very well how important the fuel pressure is. Hence I want to monitor the fuel pressure of my CRD. Where would I hook the Fuel pressure gauge (e.g. from Defi, AEM aso)? Furthermore which bar range should the gauge support? Which gauge do you recommend?

Thank you for the education.Please I have an issue with my 2013 Jeep Grand Cherokee CRD.I need your help

Very interesting! Great video in depth!

Are you a professor? I was having university anxiety after this thinking there would be a test afterwards haha great presentation bud

Thanks for the video . I've got a 2013 fuso canter 3c13 with low fuel pressure . It's now in a garage & there struggling to fix it . The truck will only start - run when the fuel pump pressure regulator is disconnected . At all rpm's above 1000 the fuel pressure is ok . It's got a new fuel filter . At the moment I think maybe the low fuel pressure sensor on the common rail may be faulty . Any ideas please ?

Bloody good piece of content. Come on, get the next video going bro I'm going to subscribe and wait for it!

I am experiencing fuel leakage from the fuel adjusting lever on my 1hz engine-landcruiser. Need some advice on how to resolve this issue. Thanks

How much diesel is supposed to flow to return line after being disconnected from injectors ? Basically when doing leak of test, i done a leak of test on the injectors , all came back same value in 5 mins , but the return line i had to put it into a bottle as in 5 minutes it filled a 1 litre bottle , is that normal ? At the same time my rail pressure at idle is 30-40 bars under what is actually comanded , even when constant driving seems to struggle to maintain a consistent rail pressure , always fluctuating -40-50 bars , back to normal and then -40-50 again. Please help

Best what I newer seen !!❤🎉❤!! It's true wreally !🎉!

Very well done 👍👍👍

Hey I'm mechanicking on a 2004 MBE OM 460 in an old Freightliner, no start after fuel filters changed. How do you prime this lemon?!

Awesome Video Mate, very well explained. Keep it up. Cheers

Very good info

Awesome video! I'm working on a JD350G and I'm experiencing issues with the fuel system. The engine sound like its running off 5 cylinders. I checked the fuel supply at #1 port at the rail and no fuel was coming out. I pulled the fitting with the spool and spring and cleaned it/checked the movement. The spool and spring seemed to be fine. At this point, I'm thinking the rail or the injection pump pressure regulator might be causing the issue. Have you experienced anything similar to this problem?

Faulty/leaky injectors can affect common rail pressure and cause starting issues.

Well done for this, regards

We are learning✍️... thank you sir.

Well done thank you.

Working on a diesel engine (cars),I find it easier than the gasoline engine, witch are a lot complicated,at my opinion.

I bought a cat c7:,refer for food ministry it starts cold but you need 2seconds of ether to start warm.. I spent 5200.00 shop put 2new batteries. 2000.00 huei pump they did not solve problem with 5200.00. I went to mechanical perfection in Medford MN. He put new governor on air system.adjusted valves he said they needed it. He disconnected fuel pressure valve above huei on head side. And it started when warn without ether. It was thanksgiving so he did not get part .I had to take truck for food share. I spent 1000.00 with him. It's Sunday truck is parked. Oh truck leaks fuel drops of front of motor about a week now been half _ 1cup when parked. Do you think original shop should have found fuel pressure valve?

Valuable video here folks

thank u bro ,thank s for teaching

Hi, if one injector only fail, can it block the other injectors from working ? And cause crank no start situation ? Lexus is 220d

Hello, I have a question of diesel fuel cooler. Does diesel engine needs fuel-cooler mandatory at fuel return line? We have high pressure pump wear problem. (the engine has no fuel cooler) I think overheated diesel fuel from return line makes high temperature at fuel tank and this over heated fuel makes damage at high pressure pump. Waiting for you opinion. Thanks , Best regard.

Awsome bro thanks plenty got it totally