We didn't end up towing the bus so I could check and see if the fuel rack was operating properly. I pulled the AFC off today. The rack is stuck :shock: I recorded this little video. We are happy to know what is causing our no-start, but bummed at the outcome. It's likely a rebuild is in order. I would be happy to have any advice at this point though for a last ditch effort to see if we can save the pump before pulling it.

Is it possible to pull the delivery valves off the pump easily to see if there's some physical debris that is stuck? Is it safe to do so? If I were to do this, is there anything I need to be cautious of (ex: flying springs that can be lost)?

If the pump needs to be pulled, is it a job that someone (myself) with a moderate mechanical ability can do? It would be great to save on the labor if it's something I can do. I would likely pull the front of the bus off (it's a flat nose), including the front grill and radiator so I could do the KDP fix and change the serpentine belt at the same time. This would make it easier to access the front of the pump (I believe). Are there any specialty tools that are needed to do this?

Here's a video. Let us know your thoughts. Thanks for all the advice.

 

it takes about a half an hour to pull the pump the only special tool you need is the pump gear puller which you can make with a little want to and know how.

to rebuild the pump is very involved and should only be done by a diesel service shop. period. they have to be calibrated on 1/4 million$ stands and have bunched and bunshes of little wierd parts in them. DO NOT ATTEMPT TO REBUILD THIS PUMP YOURSELF!!!!!!!!!
you probably just fried the barrels and plungers wich made you rack sticky and has you stuck. if this is the case and all other internals are salvageable you are looking at 4ish hours labor and 6ish hundred in parts. there is nothing to do to help your pump other than rebuilding it.

time the engine with the timing tab under the injection pump then pull the pump and send it off.

 

Yeah i agree, I would have it towed and taken care of, and if the timing slips, it can be there ball of wax and not yours... then when you get it back deal with the KDP and belt your self as thats real straight forward ..

I only say this because to time the pump you do need special tooling and such and if it slipps on you , its liable to leave you in a few places, in the driveway, or in the middle of the road again .... neither is fun ... and if its someone elses fault ,.... ya just call them to come and get it ... LOL..

 

you need no special tools to time a cummins. other than the gear puller as mentioned.

 

I definitely won't be attempting to rebuild the pump myself! When pulling the pump, does one need to get to the front of it (towards the vehicle front)? If so, it's next to impossible on our bus without removing the radiator

When you speak of the timing tab underneath the IP... our bus has an engine-powered air compressor below the IP (for the air brakes). I am not sure if this is in the way or not. If somebody has any links to videos, I can look and see. I will browse youtube myself.

Thanks for all the help. It is much appreciated. It is also good to know that it [I]could[I] be just barrels and plungers and not as much money as I have in my mind. I will hope for the best!

 

PS: Timing sounds like something I don't want to get into and I will probably have the shop mess with it all. The only vehicle I have ever done timing on is my old 77 VW Bus (that I sold before buying this much, much larger bus).

 

I would tow it in ... and yes the timing pin is under the air comp, there is a adapter between the comp and the gear housing ..

its all too much of a PITA to do your self unless you are a good mechanic and plenty of tools,know how and experience ...

I work on bus's for a living, and I can tell ya, these are a real BIT#$ to do swaps on .. i have done a couple, and HG's are really no fun ..