MX low pressure fuel

mx low pressure fuel circuit

[@luisresendiz2018]

Tanks ittt bery helpfully

[@luisresendiz2018]

Thank you for your help, it help me a lot your advise.

[@elnmrouno]

I removed the regulator valve today. It was very difficult to get to. I found the best way to get to it was by removing the shifter. Then using a 13mm shallow socket with a wobbly 6inch extension.

[@monray300]

Yep there nothing easy on these engines

[@harpreetdhindsa7774]

I have same problem can you till which side regulator valve please I couldn’t find

[@elnmrouno]

@@harpreetdhindsa7774 it’s on the driver side behind the block. Not on the head. The valve was fine. The low fuel pressure was caused by the transfer pump.

[@harpreetdhindsa7774]

@@elnmrouno where they located transfer pump I already change regulator valve still same problem

[@elnmrouno]

@@harpreetdhindsa7774 the tansfer pump is located by the air compressor. It’s on the driver side of the engine.

[@mex20oax]

I appreciate the schematic, that definitely will help, I will go see that truck tomorrow, and hopefully one of those turn out to be faulty. Thanks @damon bramel

[@monray300]

I hope it helps

[@grumpystruckshop3807]

Daf has mx, fuel filter module has valve built in,, need to replace it, complete.

[@luisresendiz2018]

Can you post a picture off the diagram please

[@user-ph8di7oq6f]

hello, I had a problem in the second section of the high pressure pump, I changed the plunger inside and the valve was jammed, now my question is with the cups is everything okay? what do you think?

[@monray300]

Sorry I don't think I saw this.

[@piotr3468]

Hi, do you know where is fuel low pressure regulator on MX11 engine. I replace the lift pump but still have only 2 bars ☹️. Thank You

[@monray300]

I'm not sure on mx11. But I think places you can loose pressure are at the lift pumps and the regulator on the high pressure pumps

[@user-fv5qt4ge5n]

good morning sir . do you mind providing a copy of the fuel flow diagram please

[@monray300]

I don't really have time. What problems are you having?

[@matthew6202]

Hey any idea why I can only get 20-23psi boost when it gets under 15 degrees outside and as soon as it is 15 or above it boost normal 30-32psi.

[@monray300]

I think maybe your fuel is jelling and restricting your filters

[@mattlacasse1910]

Can you post picture of this diagram?

[@monray300]

Can you give me your email?

[@jessicaguerra3937]

@@monray300 could I have a picture of the diagram as well? Having a few low pressure codes.

[@monray300]

@@jessicaguerra3937 I'm not sure where I put it

[@kingspring1970]

I’m getting a low fuel pressure fault. Before getting a PM, the water separator would fill all the way up. After the PM it doesn’t but I’m still getting the same code (SPN-94)

[@matthew6202]

My MX13 misfires after hitting around 40-50 mph only when you let go of the gas pedal and hit another gear. Kinda like it’s starved for fuel but if you stay in the gear and don’t let off gas it’s fine. It also does it when I go to downshift up hill but if I don’t let off the gas pedal completely it won’t do it. Any ideas?

[@matthew6202]

It’s an epa 10 also

[@monray300]

Maybe sucking Air

[@matthew6202]

Was a bad injector. Replaced them all and it ran great.

[@matthumble358]

What was the fix to this mx that only has 3 psi on low side fuel pressure?

[@monray300]

I think I made this video to answer some questions, but I didn't get to work on the truck 😊

[@matthumble358]

@monray300 Darn, I got one that's doing the same thing as described in your video.

[@sultanminhas]

Sir i have problem with fuel restrict 100 change filters again and again change 3 different dealership nothing change facing this last 5 months any kind of sugession plz. ?

[@monray300]

Is your fuel contaminated? Sometimes they put the wrong fuel filters in, if they don't use the vin number, but it's unlikely 3 dealers would. Is it restricted or sucking air? Request they change filters by vin number. I know Missoula Montana Peterbilt has 4 good paccar mechanics.

[@lilbitofhoney]

I have black smoke. Could this be the issue?

[@monray300]

I guess it could, if you have a dpf it shouldn't. What else does it do?

[@DB-bk9tr]

I hate these motors. Plastic on plastic on plastic

[@monray300]

They suck to work on