No they are lapped in pair with the rotor head and control sleeve. If there're scratches then it would affect injection pressure which would result in poor engine running.

Thanks Joe - helpful additional info. Appreciated.

When you say boost compensator breather, you mean one of the lines attached to the top very top of the pump, where the diaphragm and fuel pin is? I assume you mean it's leaking fuel, not just a boost leak. If that's the case, it might be a torn diaphragm on the fuel delivery pin. It's pretty easy to pull the top of that off, just the 4 screws (but they're really tight, get a good fitting tool so you don't strip them). From there you should be able to see whether or not that big round rubber diaphragm is damaged or not

@@bradymashak231 yes a fuel leak sorry :)…. but from my understanding fuel shouldn’t be that high, I’m thinking fuel pin seal. The diaphragm should be just dealing with boost pressure no?

And the breather is just above the fuel return on my pump, not the very top

The fuel pin doesn't really seal. So that like 2.5" diaphragm is what actually keeps the fuel from getting up into that very top portion of the pump. Can you email me a picture of the vent like you're talking about though? Still not sure I understand which one you're talking about. [email protected]

@@bradymashak231 sent

It's really hard to say for sure what caused my pump to fail. But I'm fairly confident the root cause was my failing lift pump. If the fuel pump isn't full to the top with fuel, then the entire cam plate is not lubricated and cooled properly. And worst case scenario it could actually pull some air into the pumping piston at what ag high rpm and load, the pump side of the cam rollers could lift off the cam plate (like valve hang, if the return spring is aged and theres no fuel pressure pushing it back) and then the rollers could slam back down onto the cam plate and fracture it. If your truck is idling rough, it's either compression, injectors, or the pump/fuel system. But before assuming it's the whole high pressure pump thats bad, I'd check and make sure that your lift pump is flowing fuel. Otherwise these VE pumps hate it when they have to suck fuel all the way from the tank with a shot lift pump, but they will do it and they will idle like crap at a lower than normal rpm in my experience.

@@bradymashak231 thanks for answering, i dont have a lift pump.. never had for 10 years now.. maybe thats the problem because i have good compression and good injectors

adolfo I think the white smoke on start-up is oil burning, usually because the oil has leaked past the rings (or a ring) while the engine is sitting. Unburnt fuel should produce black smoke?

At a guess I'd say its because urea and water don't make a great fuel, and that's supposed to be injected after combustion not before 😅 he also says in this video that some pumps use engine oil for lubrication, others like this (and possibly yours) use diesel fuel as lubricant. If you put water in there, its probably not going to lubricate everything correctly. Anyway tldr I'm sorry for your loss.

@@cannaroe1213 I’ve since found out water under very high pressure through the pump rotor acts like sand paper therefore score the rotor barrel and loss of compression eventually stops diesel from being able to be pumped through.

@@ForPropertyInvestors Very interesting, thanks for letting me (and everyone else) know, all the best!

Hey Magnus, sorry for a delayed response. With the engine off, there shouldn't be springs pushing that pin in. Is it possible that there was still some fuel pressure when you were trying to re-install it? That would try pushing the pin inwards like that. I don't think it will help, but maybe worth a shot, you could try moving the throttle arm and see if that helps. That would interact with the pivoting components that could be pushing the pin in, but i'm not sure it will help you.

The solenoid itself is not very likely to fail, and if it did then it would default to "not running" since the solenoid lifts the plunger up to allow fuel flow. But the rubber tipped plunger definitely could age and break, if maybe the newer diesel fuel ages the rubber, and a piece breaks off. But if that happens, im guessing it would end up restricting fuel flow, since the chunks of rubber are going to end up in bad places. More likely, you have a similar failure as mine, where some metal or dirt got into the pump, and is making the plunger not move up and down. Its not easy, but you could clean the area, and remove the solenoid and test it by keying on and off, to see if it pulls the plunger up inside the solenoid.