Caps Injector Pump on a 8.3 Freightliner.

[Phantom666]

I'm leaking fuel from one of the 6 small tell tale holes that surround the distributor module. On a caps injector pump. I was told by Cummins that it was the distributor module. So I replaced the module and still have the leak. I would assume if one or any of these tell tale holes leak. That there should be specific answers on why. Clearly changing the distributor module didn't help. Can anyone suggest ? thanks Shane

 

[Grumpy8811]

I'm leaking fuel from one of the 6 small tell tale holes that surround the distributor module. On a caps injector pump. I was told by Cummins that it was the distributor module. So I replaced the module and still have the leak. I would assume if one or any of these tell tale holes leak. That there should be specific answers on why. Clearly changing the distributor module didn't help. Can anyone suggest ? thanks Shane

dang, that is some old stuff.. a Cummins Accumulator Pump System.. I dont remember much about those except they only were around a few years .

 

[Phantom666]

dang, that is some old stuff.. a Cummins Accumulator Pump System.. I dont remember much about those except they only were around a few years .

My truck is 20 yrs old, but the caps pump is used on many different types of trucks and machinery. Which aren't 20 yrs old.
Regardless did you have any relevant info on my actual problem I posted about ?
Thanks Shane

 

[Grumpy8811]

My truck is 20 yrs old, but the caps pump is used on many different types of trucks and machinery. Which aren't 20 yrs old.
Regardless did you have any relevant info on my actual problem I posted about ?
Thanks Shane

I do not.. other than to say I would guess you need to replace the whole unit instead of trying to repair it..
this is just a Guess of the SWAG variety..

can you find anyone professional who works on those?

 

[Phantom666]

I did try and buy a fully refurbished pump from China. Cuz cummins wanted over 10k.
But when i payed for it the Chinese company tried to charge me dble. By the time I got my miney back. I spoke to Cummins. They sent me a quote and labor just for the distributor module. I never took it to them to do, and lucky I didn't.
Because I'd be in the same position but out a hell of a lot more.
Hopefully someone may have specific info or exp with these pumps. And can suggest why these weep holes may leak.

 

[Phantom666]

My point was, if I call anyone besides Cummins, I get shut down immediately cuz Cummins won't supply the parts and info. Yet Cummins themselves have no real experienced pple working in the shop here. All kids with a computer and a guess.

 

[Signal73]

Have you tried area diesel service? They work on all kinds of old and odd stuff.

https://www.areadieselservice.com/

 

[Phantom666]

Thx there Signal73.
I think a little advice from old timers might be the best hope on these pumps. Specially from the US.
I'll try n contact someone when they're open. Cheers

 

[NIsaacs]

https://www.thoroughbreddiesel.com/...ockParts/FuelPumps/InjectionPumps/CAPSCummins

https://dalessuperstore.com/c-12097...ection-pumps-caps-diesel-injection-pumps.html

 

[Grumpy8811]

My point was, if I call anyone besides Cummins, I get shut down immediately cuz Cummins won't supply the parts and info. Yet Cummins themselves have no real experienced pple working in the shop here. All kids with a computer and a guess.

sadly, that is a fact of life... the Cummins Accumulator Pump system is a proprietary system developed and manufactured in house
and was somewhat of a stop gap between mechanical injection pumps and common rail.
reality is the CAPs system is 25 or so years old.. so the chances of finding anyone still working on them
who was around when they were in use is low.

the B and C series engines all start out life as a joint venture engine between Cummins and Case..
somewhere along the line Cummins buys Case out of the deal and continues on with them.
Currently that old C series soldiers on as an ISL, which has a proprietary Cummins Common Rail system and is a stroked 8.3 so it is about 9 litres now.
I worked a bit on the original C series, which was a 2 valve 8.3 with the Bosch inline pump.
Cummins replaced the original C series with the ISC which is an 8.3 with a 4 valve head and that CAPS pump..
It was pretty primitivize by todays standards and I don't remember it being in service a long time.
For instance only thing we had to troubleshoot with was a Palm Pilot (if you remember those).
I don't want to say you are SOL but you are going to have to search for someone who may specialize in those engines
as I doubt anyone on this forum has any knowledge of the CAPs system being as it is functionally obsolete and whose use was not widespread..

 

[Phantom666]

For a visual I took these pics of the old distributor module. Note that even when I turn the key to prime with the lift pump. The hole starts leaking straight away. Then after cranking a bit to start it will stall after a few minutes. Almost as if there is an open line all the way thru the pump to the main supply line.

 

[Grumpy8811]

good luck..

 

[Seane1987]

Do you have an engine serial # or the last 6 of the truck Vin?