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Old 11-03-2020, 03:18 PM   #1
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Transfer Pump just started leaking

About 3 weeks ago I did some maintenance on my rig, Air Filter, Dryer Filter, and greased the chassis. I also did a visual inspection of the top and bottom of the engine, transmission, and brakes. I didn't seen anything out of the ordinary.

Yesterday when I went to take the rig to fuel up and drive it I couldn't get it to start and as part of my troubleshooting I crawled under the rig and again didn't see any problems. I ultimately found that I had hit my rear start switch, got the rig running and drove it for about an hour.

Today I noticed a wet spot under the engine and crawled underneath and found fuel dripping down the starter.

Dang, lift pump was leaking fuel and looked like a decent amount based on the side of the wet spot.

I went ahead and tightened the three bolts holding the pump onto the base, they seemed to be loose, I tightened them all up. I wiped off all the fuel and cycled the fuel pump probably 20 times as I was also working in another problem. It would run for 1 minute and then stop.

At the end I could not see any evidence of fuel leaking.

I do have a replacement gasket and will install that if the leak continues and then replace the pump if needed.


So my question is for those of you who have had a leaking transfer pump and just tightened the bolts, did it work, did you have another leak.
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Old 11-03-2020, 03:25 PM   #2
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….yup, I tightened the three bolts 2 or 3 times but it always leaked after awhile.... didn't know the torque spec for the bolts so had to guess....finally had to replace the lift pump....the problem with a leaky pump is not so much the fuel being leaked out, its the air being sucked in.....if so equipped, replacing the CAPS injector pump due to fuel starvation will be a major expense....
PS-- the new lift pump has machine rivets so no bolts to check/tighten.....
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Old 11-03-2020, 03:44 PM   #3
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Ö.yup, I tightened the three bolts 2 or 3 times but it always leaked after awhile.... didn't know the torque spec for the bolts so had to guess....finally had to replace the lift pump....the problem with a leaky pump is not so much the fuel being leaked out, its the air being sucked in.....if so equipped, replacing the CAPS injector pump due to fuel starvation will be a major expense....
PS-- the new lift pump has machine rivets so no bolts to check/tighten.....
Spot on advice OldScout^^^
Or bypass it and install a FASS or AirDog lift pump as an upgrade to insure the CAPS injector pump never suffers fuel starvation, the #1 CAPS pump killer.
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Old 11-03-2020, 05:07 PM   #4
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Sucking air is my biggest concern and understand the consequences to the injector pump.

I'll keep an eye on it and start checking sources and prices for a new pump.

They didn't make it easy to get at and besides that there is a plate mounted to the pump bracket that supports some sort of wiring harness. I can get to it from the bedroom access hatch but it is tight quarters working blind on some of it.
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Old 11-04-2020, 01:36 PM   #5
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i have the same issue. I decided to bite the bullet and change the pump. That pump (ELECTRONIC FUEL LIFT PUMP #5362269) is hard to come by, most suppliers are out of stock and have them back ordered. I was luck to find one at M&D https://www.mddistributorsstore.com

The install looks to be a knuckle and head banger. Can't Wait ! (not)
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Old 11-04-2020, 04:01 PM   #6
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i have the same issue. I decided to bite the bullet and change the pump. That pump (ELECTRONIC FUEL LIFT PUMP #5362269) is hard to come by, most suppliers are out of stock and have them back ordered. I was luck to find one at M&D https://www.mddistributorsstore.com

The install looks to be a knuckle and head banger. Can't Wait ! (not)

Did you get the install kit which consists of the O-Rings???
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Old 11-05-2020, 07:11 AM   #7
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Yes, the parts guy I spoke with suggested that. It should arrive tomorrow. Thanks for the reminder.
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Old 11-07-2020, 08:28 PM   #8
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I went through this last year, leaking lift pump was replaced. This year the injector/high pressure pump fuel distributor module failed, replaced at Cummins Great Plains. The service manager said they normally replace both high pressure pump and lift pump at the same time, lift pump failing will cause the HP pump to also fail. The transient suppressor must also be replaced when working on the high pressure pump or the factory warranty is voided.
Yes replacment pumps are scarce due to this pandemic, production was halted for 4 months, then very slowly resumed. This created a huge back-log of orders, and higher prices resulting from safety and health measures required to protect workers.
Last July I paid $5K to have the 12v fuel distributor module and transient suppressor on the high pressure pump replaced. A new HP pump was $10k including labor at that time.
This is a Cummins repair shop and they could not obtain Cummins parts same-day or overnight as they normally could, it took a week to get my remanufactured fuel distributor module.
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Old 11-07-2020, 08:54 PM   #9
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There nothing wrong with the pump zero wrong the gasket doesn’t like the diesel. Just change the gasket it’s easy and you’ll stop sucking air. Once again there is zero wrong with lift pump no need to change
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Old 11-07-2020, 10:17 PM   #10
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There nothing wrong with the pump zero wrong the gasket doesnít like the diesel. Just change the gasket itís easy and youíll stop sucking air. Once again there is zero wrong with lift pump no need to change
I read about that after the new pump. i have the old one in my garage, just have to buy a new gasket. I saw a link in one of the threads similar to this one.
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Old 11-08-2020, 08:42 AM   #11
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Morning everyone, so i saw boatmans post that hes going to change his lift pump, from someone who was just under my own rig installing a bypass hose around my lift pump ( due to i installed a FASS fuel pump upstream) my biggest challange was cracking the line loose. The fitting in the pump had to be held while turning the fuel line nut, theres just no room for a second pair of hands in there. However i can say i got it done, time to bypass the pump was a little over 2 hrs. I could have shaved 30 min off if i had a ground crew to help... fetching tools, leaning in from above the engine to hold or tap with a hammer. My 1 bit of advise put a jack stand or a log in case the jacks quit or ??? Good luck
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Old 11-08-2020, 12:25 PM   #12
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When I first started reading about the transfer pump leaking I found a copy of the TSB which listed the part numbers of the gasket. There is not an OEM Cummins gasket, they do not sell (I guess they want to sell the whole pump for ~$500).
I did find a source and bought a spare gasket for ~$8 about 4 years ago from Capital Volvo
Montgomery AL

334-262-8856


Gasket PN 4928511 $6.71 + $1 shipping
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Old 11-09-2020, 03:13 PM   #13
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….before I opted to replace my lift pump--second time on my 2003 400ISL, first time was under Cummins warranty; I was researching the idea of a gasket replacement....best I could find, there were several gaskets available from a few different sources.....the problem I found was that based on several different pump serial numbers over the years, there were also several gasket numbers based on a specific pump application--perhaps the gaskets are enough alike that it really doesn't matter--but no longer an issue form me--oh bother…
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