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Old 05-29-2020, 11:22 AM   #1
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ISC CAPS Lift pump gasket

Are any members aware of a current source , for the updated gasket , for this application ?
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Old 05-29-2020, 11:36 AM   #2
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I bought one for a spare several years ago. Still have it, knock on wood!


Got it from Capital Volvo in Montgomery AL
https://www.capitalvolvo.com/

Cost was ~$8 with shipping.

Part number was 4928511


Talked to the part sales dept and the guy just stuck in an envelop and mailed it to me to save on shipping.
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Old 05-29-2020, 11:49 AM   #3
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...as I understand it...there are several versions of the gasket, base on different ranges of serial numbers for the lift pump over the years....perhaps there is also a generic version too....
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Old 05-29-2020, 07:27 PM   #4
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Look for a thread by IMPRSD, he told where he bought some and included the part#.
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Old 05-29-2020, 10:22 PM   #5
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I'm afraid I never bought a lift pump or replaced my lift pump gasket in my 2003-ISC-350-CAPS engine, because I fixed my air in the fuel line problems by simply tightening my 3-lift pump bolts (#6 in the diagram below).

However, I saved this distributor's information on CAPS lift pumps for future reference, but as "OldScout" implied, I too am under the impression there were different types of gaskets for pre-2002 ISC/ISL motors, so this is one of those cases where you need to find out what the latest part numbers are.

When you find out the latest information, please post for the rest of us! ...And while I'm guessing you want to talk to Cummins... maybe you need to call your chassis manufacture for a part number update and price.

Here's a reference to an aftermarket lift pump I think is every bit as good as the one Cummins sells for twice the price:

https://www.mddistributorsstore.com/...-transfer-pump

Note: MD Distributors is a large a reputable company with their own Turbo rebuild shops. They have many locations and I don't think they sell anything they have not qualified. They service the Semi-truck market mostly, but they have inventory on a lot of Cummins engine parts.

Here's some information I captured off the MD Distributors website above...

Make(s): Cummins
Engine(s): 8.3L ISC C-Series & ISL
CPL #(s): 2691, 2692, 2693, 2694,
2695, 2964, 8106, 8158

Manufacturer: FP Diesel
Use with: CAPS Fuel System
CAPS: Cummins Accumulator Pump System

Voltage: 12 Volt

Includes: 2 Threaded Plugs
(3678923)

Not Included: O-Rings &
Sealing Washers
(See Below
for Install Kit)
Install Kit: 4935005-INS
Install Note: Install Kit contains all
O-Rings & Sealing
Washers required to
install this pump for
all configurations.
Pump Note: Older 8-Port Style Pump
bases will need 1 each of these plugs 3040815 & 3046202
(Below)

Plugs: 3040815, 3046202, MFL-2408-06, MFL-2408-08

===> Another thing you can do for us is this: When you take apart your lift pump, please let us know if you come across the #10 check-valve sitting on top-center of the lift pump; or if you see it in the Lift Pump Manifold body as drawn in the diagram below. Thx.
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Old 05-30-2020, 08:37 AM   #6
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…..I too resorted to re-tightening the three manifold bolts on the pump for several years....I was not aware of the torque specs so went by feel/fear. Probably didn't achieve the right torque or gasket was too deformed to stay tight, as every so often, pump would leak again.
I am a DIYer, and had the new pump in a box, but access to my 2003 ISL engine is difficult so had Cummins do the replacement....who knows how much damage I may have already done to my CAPS pump over the years....works fine for now with smoother running and a bit more power--my opinion. Guess time will tell.....
PS--I have the old pump and gasket in a box--for future inspection/curiosity.....
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Old 05-30-2020, 04:51 PM   #7
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Google search for the two Cummins P/Ns in the PDF .

P/N 4928511 & 4928512 came up to available on E bay with info on an after market supplier.

Bill Bunton
Auto Supply & Machine, INC.
( 956) 565-2473
e mail....sales@buntonauto.com

Notes from the supplier say ; they got Cummins OEM gaskets , located a supplier for the exact material and are cutting the replacements.

E Bay , $14.95 + shipping .

Search ... Cummins ISC CAPS primer pump gasket 4928511 or 4928512
Attached Files
File Type: pdf Cummins Lift Pumps (1).pdf (214.6 KB, 102 views)
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