DAF CF FUEL Pressure control fault WITH JALTEST.

Bit of electrical and mechanical diagnostics this week with a DAF CF PACCAR MX-11 ENGINE with a FUEL PRESSURE CONTROL VALVE FAULT! Nothing we can't fix with the help of JALTEST From ECLIPSE DIAGNOSTICS.
If you want diagnostic leads you will find them here on my shop: www.trucktechuk.com/product-p...
if you're interested in any of the JALTEST TOOLS RANGE head over to: www.eclipse-tech.co.uk/eshop/
🔧 Got Repair Stories to Share? We love hearing from our viewers! Share your own diagnostic experiences and repair tales in the comments. Let's build a community of tech enthusiasts passionate about solving challenges and mastering the art of repairs.
🛠️ STUCK FOR HELP, DON'T MISS OUT! 🛠️
Did you know Truck Tech UK also has a member-only area!!!! This gives you access to posts and videos not found in the public domain! Also questions and answers for members who are struggling with faults and want help.
All that and more can be found over at: www.trucktechuk.com
#DAF #fuelfault #jaltest #trucktechuk #cf #mx-11 #dieselmechanic #repair

[@MrTobymartin1]

I’ve been watching your videos and all I say is your very good at your job 1st class you put people to shame keep it up 👌and keep the videos coming doesn’t matter how long they are personally your showing the job from start to finish

[@TRUCKTECHUK]

Hey Toby thanks for watching the videos and for the comment also. I'm glad you enjoy them. I try my best is all I can say 😌.

[@StaticVapour590]

Nice to see you in action. I respect truck/lorry mechanics, would be pretty hard to get parts for cars at our shops, food in grocery stores, construction sites working or mail and parcels moving if nobody maintained those beasts.

[@TRUCKTECHUK]

I'm always in action lol if it's not fixing them, it's on the emails and website helping mechanics fix them 😎👍 I wonder what it would be like if all the trucks disappeared 🤔 I know all the technicians are......trucks are more complicated than cars now 🫣

[@stevenhandford4426]

Top job need more videos like this plenty for car faults but very little for uk commercial vehicles Thanks advise that I have received through your videos

[@robertanderson-yx8mo]

Your a first class master technician loved the video.

[@TRUCKTECHUK]

Thanks buddy. Glad you enjoyed the video and hopefully it will help one day 😎

[@markthompson4733]

Excellent as always.

[@TRUCKTECHUK]

Thanks again!

[@PH-Truck-Mechanic]

Excellent job!!!😁

[@TRUCKTECHUK]

Thank you mate 👍😎

[@herrkiwi3110]

Absolutely LOVE those Snap On Flank Drive Plus spanners.

[@TRUCKTECHUK]

I do miss Snap-on making decent tools and unfortunately, I can never catch up with a Snap-on dealer to get things fixed so end up buying halfords stuff now 😅😅😅🫣

[@havocprod]

Well done mate

[@TRUCKTECHUK]

Thank you buddy 😎👍 glad you enjoyed the video 😆

[@BurnedOutGarage]

Good old MX11 fuel system faults. I have done quite a few pressure control valves on them. I did one a while ago that had water in the tank. Injectors, unit pumps everything fooked. Great upload Russel!

[@TRUCKTECHUK]

Hey thanks for the comment. I think fuel system faults are my biggest call-outs. I should look at buying these valves direct ha ha ha. Oh water is horrific, wouldn't surprise me if this has had water in looking at the fuel pipe corrosion 🥲

[@detenator890]

How much water was there? And why didn't the Davco filter catch all the water?

[@BurnedOutGarage]

@@detenator890 The particular machine I was looking at was a Tipper/Grab 8 wheel they spend most of their life covered in dirt and getting beat to s... The one I looked at - the sideguard was pushed up against the tank and it rubbed through about 2/3 up. I think just driving in wet weather and it being washed was enough to get water in the fuel. Yep there was water in the separator.

[@mauritztoivonen1070]

Thank you.

[@TRUCKTECHUK]

No problem my friend 👍😎 hope you are well buddy 👌

[@ridarthurmyers]

Thanks I like it

[@TRUCKTECHUK]

I'm glad you liked it buddy and thanks for dropping by 👌😎

[@newaej8484]

Nice

[@benyapetri]

Good job mate, amazing as always, the fuel system is a very common issue for the Daf. Well done!👍

[@TRUCKTECHUK]

Hey buddy 😎 yes delphi really slipped up with this system draining unfiltered fuel into the unit pumps....and NGD isn't much better up to now 😵‍💫😵‍💫😵‍💫 Could be worse....it could be the exhaust system couldn't it 😅😅😅😅😅🫣🫣🫣🫣

[@benyapetri]

Ohh that's right pal, don't tell me...😅🙈 just today I was called to a truck because it had problems with the regeneration of P3796 and had to leave urgently, the problem was with the temperature sensors after the BPV and before the DOC The temperatures varied a lot, however, no error on the sensors. 🤦🏻‍♂️

[@TRUCKTECHUK]

Oh noooo 🥲🥲🥲🥲 well we did speak about the temperature sensors on the forum and how they should ambient when cold. Usually, the truck knows if one sensor reads say 300*c at the DOC then the DPF should be 550*c so I'm surprised you didn't get a fault code but we'll done finding that 👍😎

[@benyapetri]

That's how I thought too, that it should give an error on the temperature sensors. It is an EAS 3, stationary regeneration failed because the temperature did not rise to the correct parameters and I succeeded with mobile regeneration when the engine was under load and high RPM.🙈

[@TRUCKTECHUK]

@benyapetri4965 glad you got it going buddy 🫡 hopefully the sensor comes out when you change it 😬

[@stevenkerry3101]

great video and very informative how's things been going for you since you started working for yourself mate .

[@TRUCKTECHUK]

Steve! How are you buddy!, I’m glad you found it informative mate 😎. I was worried I’d have no work but I could work 7 days a week at the moment 😂😂😂🙈

[@stevenkerry3101]

@@TRUCKTECHUK glad to here it mate

[@mickbusby782]

nice job pal hope ya well

[@TRUCKTECHUK]

Mick! How are you buddy! Hope you haven't bought any more transits this weekend lol 😆

[@mickbusby782]

no more mate @@TRUCKTECHUK

[@TRUCKTECHUK]

Won’t be long buddy! I’m gonna need a new van soon lol

[@mickbusby782]

bigger van like mate @@TRUCKTECHUK

[@johnbell6854]

Very interesting are you any good at fixing vibrations on Scania’s I am having a living nightmare with one

[@TRUCKTECHUK]

Hey John, thanks for the comment. I've not had much to do with Scania unfortunately. Is it more of a engine vibration or through the steering wheels/cab?

[@johnbell6854]

@@TRUCKTECHUK its coming through the seat we have balance the prop 2x replaced the diff stripped the gear box new clutch replaced gear box mounts new tyres Different wheels changed disks and ran out of ideas

[@xity69]

Ive got a MAN TGA D2876, which i suspect is leaking fuel back to the tank when running,also has hard starts when left overnight or even just after refueling, could my pressure limiting valve be faulty?

[@TRUCKTECHUK]

Hey, thanks for the comment. It could be a low-pressure issue also but it all depends on fault codes and live data 👍

[@williamshalua2508]

Hi brother How can I get JALTEST?

[@thrideyeholder3243]

The gelset boss😂

[@amyedwards3706]

👏🏻👏🏻👏🏻

[@TRUCKTECHUK]

Oh thank you very much and thank you for your "slow clap?" 😅

[@cm95661]

Hi Russell. Just wondering where the return you took off runs to and why fuel not returning down that line then allows the truck to start?

[@TRUCKTECHUK]

Hey thanks for the comment so the return I blanked off returns to the fuel tank. It's basically an open pipe. This must be shut when the trucks running or you lose rail pressure Which was what was happening in this instance

[@cm95661]

I see, I was only curious because of the none start, but then when leak off is into a container, the fault essentially remains the same, but the engine runs? If you catch my drift 😅

[@TRUCKTECHUK]

I'm convinced the driver just couldn't be arsed with it so said it didn't start 😂. One way is to leave it where it is and go home, I should have tried it first really but I was only relaying the customer's concern

[@cm95661]

Ahhhh got ya! Makes sense now, thought I had missed something. Thanks for the clarification. Keep up the content pal its really informative!

[@richmondpennel5990]

Thump up

[@TRUCKTECHUK]

Cheers buddy 😎 thanks for watching 👀

[@CreRay]

Excellent diagose as usual! My first thought when I read the title was too high internal leakage due to injector ring failing, isn't that a common issue anymore? I assume the PCV is actuated at engine off to depressurise the fuel high pressure part, is that correct? It could be good to issue a warning in the video concerning the pressures of the fuel system, fuel spray can be invisible (yes, really) and very harmful. You obviously know what you're doing but an uninformed individual could draw the conclusion that there is no risk in undoing the nuts of the fuel rail.

[@TRUCKTECHUK]

Hey Ray thanks for the comment. I've a video here where I do both this valve and all the injectors but it's 2 hours long.....so I'm cutting it down to upload one day. Yes the PCV should drop all rail pressure at the key off and not leak off during the running of the truck. You saying about pressures, I'm glad I didn't run the high-pressure test which would have taken the rail to 2500 bar 😅

[@noelgore1360]

Why would you want to edit down a potential blockbuster like that?

[@autobild01]

👍

[@TRUCKTECHUK]

Thanks for the thumbs up buddy 👍 👌

[@onomonkeys]

No but have since it wouldn’t start and swapped over with two other unit pumps

[@TRUCKTECHUK]

Have you had any luck with this? Be interested to know how you got on buddy!

[@thrideyeholder3243]

I wonder how much a job like that cost the owner

[@Hmm265]

No need to take the rail off, big pair of mole grips round the body and a 29mm spanner

[@TRUCKTECHUK]

Hey, thanks for the comment 👌. I've never used mole grips on one. I use a 'P' clip and a screwdriver to move it due to the potential damage you can cause to the body of the fuel pressure control valve.

[@FarruxDavronov90]

Hello. help me please. I have a daf xf106 2017. error P3960. which sensor needs to be replaced?

[@TRUCKTECHUK]

Off the top of my head that is a PM sensor fault. PM sensors are mounted on the outlet pipes on the SCR as they check for Particulate Matter AKA SOOT.

[@FarruxDavronov90]

thank you very much. I respect your work. may I ask? But does this sensor need to be changed with its unit or separately? Do you have a part number for this sensor?

[@FarruxDavronov90]

I am from Uzbekistan

[@TRUCKTECHUK]

Hey thanks for watching the videos 😎. The sensor has to be changed completely and I don't have the part number unfortunately.

[@FarruxDavronov90]

Thanks a lot. I watch your videos all the time. good luck to you

[@onomonkeys]

Hi I have a mx11 which we did the cylinder head gasket on and can’t get it to run after.We have changed everything on the low and high side fuel system and still nothing.we watch live data and we can prime system to 150 to 180 psi with hand primer and then we turn over and no rail pressure rises.we have bypassed the fuel filter element and gone off the lift pump straight to the high pressure pumps and still nothing.we have taken the high pressure pump pipes off to the rail and watch the diesel come out of them but still no rail pressure any ideas?

[@TRUCKTECHUK]

How is the timing on the engine? Did you have the unit pumps out at all? Have you tried blanking the fuel injectors and monitoring rail pressure? Is your cam and crank signal okay?

[@onomonkeys]

Blanked all unit injectors off and still no pressure and both cam and crank signals are saying synchronised so believe timings ok

[@onomonkeys]

We have also swapped unit pumps as well

[@TRUCKTECHUK]

@onomonkeys did you take the unit pumps out at all when you did the head?

[@TRUCKTECHUK]

So you have swapped the unit pumps over, cam timing is correct and you have blanked the injectors and it still won't make fuel pressure. Where is the truck?

[@user-ob9xg5ee1p]

❤❤❤TURKMENISTAN 🇹🇲 GOOD

[@TRUCKTECHUK]

Hey thanks for the comment and thanks for watching 😎👌👍

[@warhammermodsmith]

Second again!!!!

[@TRUCKTECHUK]

Stu, she's catching you up on the first comment counter 😅😅😅😅😅. Thanks for the comment buddy 👍

[@warhammermodsmith]

@@TRUCKTECHUK lol I’m blaming SpongeBob for this one

[@TRUCKTECHUK]

@@warhammermodsmith 🧽👔

[@bennoben1653]

👍

[@TRUCKTECHUK]

Thanks for watching mate 😎👍