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Don't rule out the starter as Glenn mentioned!

Rule of thumb ! If the engine starts up clean running on all 6, suspect electrical. if it stumbles to a start suspect air in fuel! Could even be something as simple as an ignition switch !

They will be after market! How ever most of the mack sensor parts are made in Mexico ! Pick your straw!

They all do even stock turbo? The lengths are different!

I don’t know where you live how ever if you got a local fuel shop you might want to check with them! Also mak sure your air filter is clean this has caused issues in the past specially with a high output turbo and fueled up engines! In the land of oz the v8 was or could produce 650-700 hp we installed an ozy turbo on several trucks here and as your observation 35-40 psi boost was not uncommon! Just tweaked the fuel to the need! Note the drain tube was a little different so beware!

Could be a Differential issue

With the engine running I would suspect lots of bloby at the draft tube in the low compression dept! Im sticking with my tank vent or or his suction line theory for now Joey ! Just running with his symptom's at the moment! The lost of prime makes the most sense at this point! In the first statment only in the morning next statement after ten minutes of shut off! Rule of thumb ! If the engine starts up clean running on all 6, suspect electrical. if it stumbles to a start suspect air!

Yup cheers to all Bros !!

So keep us posted on this interesting issue! If the issue persists after the suction Lines are replace check the tank vent!your description really describes the scenario to a tea! Vacuum created in the tank sucking the fuel back when shut off!

Yup

once again check the grounds on the block under the starter and the starter connections! Rule out the cheap and easy first! you have all ready parts cannoned it by the sounds of it! Just saying! also check your tank vent!

What is your battery voltage? if you got less than ten volts on the crank it won't let the engine have fuel! also check the grounds on the block and the starter connections!

I would use the Mack spec pump the inc pump shows banjo fittings!

Think you should stick with the brand specific one ! The ihc one has banjo fitting bosses!

Yup that’s a crap shoot! Performance six pack ! There’s why you don’t use your own parts !

True! pick your poison !

Good for removing oil after an oil cooler failure! Don't know about rust thou!you have to flush the system several times with water to purge the soap out!

IF THEN DON"T have to do it twice! Do they have Experience? That be my worry! Just sayin

I seen how pampered these need to be assembled ! I also seen guys use the injectors over and fail 2 months later! Its hit and miss if you don't replace everything from what I seen! Onyx I Think For the most part the MP engines bottom end are a solid in design! The top Not so much! The Fragile and temperamental head and fuel system design spoils the pudding for me! If Joe were to take on doing these cups at his shop he wouldn't sleep at night wondering WHEN they will be back ! sure there's lots of work out there in this department however he has no dealer or boss to hide behind when things go sour! And sour is Easy to achieve with this set up! I have not tried this or heard of any one trying of re torqueing these injectors after a weeks running or so how ever I think it may aid in prolonging how long they would last! That said a bunch more messing around! Joey got a good gig there just working on a sure fire gray engine that you can for the most part count on not to come back on you! untill The Big V opens there Eyes and Redesign that fuel system nothing going to convince me of anything different! Guess it comes down to my insecurity and not had the opportunity to really bond with the product in some respects! I bonded to the gray stuff knew its weaknesses and strengths Very for giving to repair BlaBla Bla! As always my opinion!

Really ! not up to the challenge buddy ! ? Or just smart! I choose the latter!!😇

Moral support from me only 🙏 I’m just a side walk superintendent!😂

Yup ! Pay attention to Onyx610! Also injectors can be reused if the sealing areas and non sealing areas on the tip of the injectors are ok!!!!!! You don't want to do the job twice! Its a warning ! Don't over look it! Seen this job backfire trying to cheap out! Be absolutely sure your injectors a usable! Just sayin!

Your better of going to a mack or volvo dealer ship that has the tooling for this project! You can pre plan all you want you always find your short something! Also it can get so bad even priming it will not keep it running! specially if you are working it hard! Just sayin!

All good bro just don’t want to step on toes! Buddy!

Don't want to take work away from Joey But ! Mike did you pull that fitting right out don't just take the wing nut out pull the whole fitting! I have had those pugged solid with corruption! Do this first before getting carried away!