Try roger Drennan, at Cotswold Diesel Engines.

He may have that part as a good used item. If so he will want a fraction of the price you have been quoted.

https://gb.kompass.com/c/cotswold-diesel-servicing/gb07710907/

OP, is that a genuine Lister CS 16/2 engine you have in your canal boat?

Or is something more like this (and of Indian origin)?

https://www.stationaryengineparts.com/Publicity.html

If you like a challenge, then this could be for you:

https://www.ebay.co.uk/itm/275048003511?hash=item400a2377b7:g:EgMAAOSwlglhnhL8

However, be aware that genuine JP spares are next to near non existent in your part of the world, and you will most likely need to source parts from India.

Whilst the JP engine is far more robust than its CS relative, it has always been an engine for people with deep pockets, due to the supply of genuine spares largely now been concentrated in the hands of a few UK based dealers.

Having had a bit to do with Petter PC engines, I can confirm that a PAZ1 injector holder will not be suitable. Early PAZ1 injectors are clamped in position with a bridge piece (much like a Lister CS). Later ones dispense with the bridge piece, but are still not suitable as the high pressure fuel connection is at a compound angle to the vertical axis of the piston. Hence if you tried a complete injector assembly from a PAZ1 engine in a PC1. there would be a good chance that the injector spray pattern would be wrong as it would not entirely line up with the combustion chamber in the PC piston crown.

IMHO you would be better to use a Bryce injector holder from a Petter PH or PJ engine, as they look very similar to the correct PC injector holder. Do you have the injector shroud or is that also missing? Both of these items are easily found on the likes of Ebay etc.
If so you may be able to use the same item from a PH engine, though you may need to modify it somewhat.

IIRC The injector shroud on a PC engine was turned out of copper bar, and was a real work of art.

The injector nozzle from either a Petter AV, or PH may be a better choice, as the combustion chamber design is similar to the PC engine (valve cutouts), whereas the PAZ1 combustion chamber has no valve cutouts in the piston crown.

Finally I suggest that you contact Jim Perkins, as he has a website for Petter engines, and may be able to help you with a source of parts.

I do have some used PC parts myself (no injectors or injector shrouds) from a PC2 I rescued from a scrapyard just for the electric start parts, and which I am now looking to move on, as I have no further need for these parts.

As suggested another lift pump or repair kit will be the solution but to confirm this rig a gravity feed fuel pump to your system.
This might help identify the problem but the pump needs to be working properly to pressurize the fuel to the correct pressure to feed the rack then injector. Start with the gravity feed then if that works you know it is the lift pump

Sorry, but I have to disagree with you, as the air cooled version of this engine the ST2 operated in numerous applications with a gravity feed fuel system with no problems whatsoever, with the tank mounted directly on the engine

contact dieselman in Kanas email gary@dieselgen.com

I would be surprised if Gary can help you out on this occasion, as the Petter B series diesel engine is rare to see in the UK, let alone the USA.

I struggled to get parts over 10 years ago when I had involvement with B2 engine that was in a canal boat. I had to overcome the exact same problem that you have described.

The owner managed to find some new guides (at a price that would suggest they were made from unobtainium), he also found some exhaust valves from another application that were close to the originals which I had machined accordingly.

The inlet valves were a challenge, because of the shroud on the valve head (these valves will wear on the stem because they are pegged in position, and hence do not rotate).

We got over it by having the inlet valves shot blasted and then TIG welded on the seat area and all of the stem. They were then machined  to a slight oversize on the stem, allowing the worn inlet guides to reclaimed with a an adjustable reamer. This approach with inlet valves also allowed him to keep the inlet valve guides he had bought for possible use at a later date.

If it is of interest I have a couple of +0.040" oversize pistons for that engine I would consider selling, as I have no use for them.

I never got involved these engines in any depth, due to not been impressed with several of the cheapening up features on this engine range.

Anyway back to your problem, if these engines are anything like the earlier LP engines I have worked on. You will have noticed the main bearings are located in circular housings (cheeses). These cheeses are located in the crankcase with hollow dowel pins (which are not obvious unless you know where to look). There may also be other dowel pins which are located under bolts in other areas of the crankcase.
Proceed to remove any likely bolts that appear to have no immediate function, and  the oil pipework from the main bearing area, and if you probe down these holes [with a suitable O ring pick or similar], you have now exposed in the main bearing area of the crankcase casting, you will feel a hollow dowl pin, these are threaded so you can extract them with a suitable size of studding.

Once removed you can extract the crankshaft complete with the main bearing housings from the crankcase.

This item:

https://www.ebay.co.uk/itm/LISTER-CS-SINGLE-CYLINDER-CRANK-SHAFT-BRAND-NEW-3-5-1-6-1-DIESEL-ENGINE/284219484117

Has now been on ebay for over a week (at the time of starting this thread). For a genuine NOS crankshaft that is a bargain price, and I cannot understand why it is still unsold. Obviously the interest in Lister CS engines is not what it once was.

FWIW: I have had dealings with this seller in the past, and he is a reliable chap.

Interestingly if you wanted an Indian version of this item it is available from the well known UK based seller in York, and it would be approaching twice this price.