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Old 11-06-2018, 10:43 PM   #1
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ISC 350 Fuel Pump Replacement

How much?
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Old 11-06-2018, 11:01 PM   #2
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Are you talking injector pump or lift pump?


Injector pump about $3500 plus install


Lift pump about $500 plus install
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Old 11-06-2018, 11:59 PM   #3
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Are you talking injector pump or lift pump?


Injector pump about $3500 plus install


Lift pump about $500 plus install
It's the high pressure injector pump.

I was quoted $4500. Is that the price if you don't return the core?
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Old 11-07-2018, 09:21 PM   #4
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Quote:
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It's the high pressure injector pump.

I was quoted $4500. Is that the price if you don't return the core?

IIRC, the pump price was 4500 if no core
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Old 11-08-2018, 01:28 PM   #5
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IIRC, the pump price was 4500 if no core
Is the same high pressure pump used on a CAPS and on a rail system?
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Old 11-08-2018, 06:13 PM   #6
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Quote:
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Is the same high pressure pump used on a CAPS and on a rail system?
No.
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Old 11-08-2018, 06:25 PM   #7
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No.
In that case, what pump do I need on my 2001 Newmar w/CAPS?
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Old 11-09-2018, 07:46 AM   #8
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Quote:
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In that case, what pump do I need on my 2001 Newmar w/CAPS?
There is a lift pump which only works for 30 seconds or so before and after you start your engine. Once the engine is running, the injection pump has taken over and the lift pump stops. Cummins says the lift pump runs for 30 seconds, but it doesn't take that long for my "Wait" light to go out so it must run a few seconds after the coach is started.

Replacing a lift pump is inexpensive and not difficult to do, as far as diesel engines go, ~$600-750 to have it done by a shop. The injector pump is much more expensive and I've seen people say they've paid anywhere form $4,000 to $7,000.

The system is a poor design as the failure of the lift pump can take out the injection pump

Here's a current thread about the lift and injector pump.

Repeating CAPS Failures - Need Help
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Old 11-09-2018, 08:11 AM   #9
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I don't know if this is any help at all.

Here's a remanufactured injection pump for $1,295. This is just the pump, but it looks like the accumulator module is included. Quick Serv also shows an injection pump with the accumulator with another part number. I have no clue if you can buy the pump and accumulator together cheaper.



https://www.tamerx.com/accumulator-c...yABEgJl4_D_BwE

Here's a picture of the pump from Cummins Quickserv. The accumulator is #1.



And another pic of all pump and accumulator. The accumulator is #34.



This is the lift pump, also called the fuel transfer pump. $391





https://www.mddistributorsstore.com/...er-pump/1.html
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Old 11-09-2018, 09:42 AM   #10
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Just to comment on one post above --- the lift pump and the wait light are not directly related (as much as I am aware)

My wait light comes out in a few seconds, until the rpm counter sweeps the dial. (I think that is just a sensor preheat / ECM check - might take longer in cold weather)

The lift pump then stays on for the 30-50 seconds as was noted. It then times out on its own when it times out.

When you first turn on the key the lift pump starts to operate. You should be able to turn on the key -- go the the rear of the RV, and listen to the lift pump which will time out in 30-50 seconds.

I know this because I had a lift pump issue in Alaska and had to "prime" my engine with the lift pump several times before it would stay running. I had it
replaced at Cummins in Fairbanks and have had no issues since then and have RV'd another year. It could have been a gasket issue which is common and you can read about that with a search on here. I was not however going to work on it myself when in the middle of the Alaska trip.

thx Dale
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