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Old 09-25-2020, 10:41 AM   #1
Epp
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Replacing the lift/transfer pump on a Cummins engine

Hi everyone, it looks like I need to replace my lift/transfer pump on my Cummins engine. I have a 99 Newmark Dutch star on the spartan chassis with the Cummins ISC engine. I’ve done quite a bit of reading on the form here about ordering and changing the pump out, but what I did not see, or I missed it, is; can you just remove the three hex bolts on top of the mounting bracket, unplug the electrical connector and drop the pump out? And then reverse this for installing the new pump? I understand I would have to make sure I got all the residual gasket material off between the old pump and the manifold.

Other than physical access to the location on the engine, is it this simple of a job?
Thanks in advance,
Epp
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Old 09-25-2020, 12:21 PM   #2
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Some members report that the replacement pumps are only available with the manifold .

But I'm thinking that just the pump , has to be available .
Yes the three bolts and electrical connection is all that's required .

Did you happen on my post with supplier info for those who require the gasket only as the part is no longer available from Cummins.

http://www.irv2.com/forums/f123/isc-...et-490205.html
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Old 09-25-2020, 12:35 PM   #3
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….,Don't think its quite that simple--the pump and manifold come as a single assembly, so you have to remove the pump mounting bracket from the side of the engine [not the 3 manifold bolts on top]...The pumps are also shipped with a generic hose manifold config so you have to open some inlet/outlets and plug others to match your fuel hose config....old hoses tend to harden over time so it often difficult to reconnect the "shortened" OEM hoses....also watch for leaks on the injection pump banjo fittings....Lastly, access and other engine components tend to block or restrict access to the pump.....this is often not an easy task to accomplish on RVs...
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Old 09-25-2020, 03:29 PM   #4
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Quote:
Originally Posted by Skip426 View Post

Did you happen on my post with supplier info for those who require the gasket only as the part is no longer available from Cummins.

http://www.irv2.com/forums/f123/isc-...et-490205.html
Yes I did, and I appreciate it.

I spent the last day or so on and off reading about the FASS & air dog pumps, And I remember seeing your post about the gaskets.

I think I am going to go down the route of the auxiliary fuel filters andpump but I did want to address the gasket on my rig since I believe it is original to 2001.
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Old 09-25-2020, 03:31 PM   #5
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This was one of the reasons I wanted to leave the original manifold and the hoses alone. I was thinking just remove the new pump from the new manifold and bolting it in place on the old manifold. This is if I don’t go down the road of just replacing the gasket.
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Old 09-26-2020, 08:23 PM   #6
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Quote:
Originally Posted by Old Scout View Post
….,Don't think its quite that simple--the pump and manifold come as a single assembly, so you have to remove the pump mounting bracket from the side of the engine [not the 3 manifold bolts on top]...The pumps are also shipped with a generic hose manifold config so you have to open some inlet/outlets and plug others to match your fuel hose config....old hoses tend to harden over time so it often difficult to reconnect the "shortened" OEM hoses....also watch for leaks on the injection pump banjo fittings....Lastly, access and other engine components tend to block or restrict access to the pump.....this is often not an easy task to accomplish on RVs...
I have the same ISC 350 engine, the lift pump is a difficult place to access, I had to remove the starter to gain access from underneath, and stand on my head from under the bed.
Consequently I decided to have the lift pump replaced by a local HDT repair shop. Total cost $3K, including all new hoses.
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Old 09-28-2020, 06:59 PM   #7
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I had to remove the assembly as a complete unit. Cummins only sells it as a unit, I think it was around $350 to $400 for the pump assembly. I pulled up the bedroom floor and could lay down and reach it easily. Have to remove all the fuel lines and electric wire, remove mount from side of motor and install new unit in reverse order. Only took me a few hours to do the job. Hope your job goes as well as mine did
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