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Hot water lift pump

Yahoo Message Number: 82082
Saw a small wet spot under the engine compartment, found the hot water lift pump was slightly wet. Looked at the possibility of just bypassing it for the time being. Looks like it would be a real vocabulary tester. Tightened up the 2 screws at the bottom of the pump and disconnected the hot wire in an attempt to relieve the pressure at that point. Have only driven a few miles, but it is not leaking at this time. Have anyone done the bypass yourself or did you just replace the pump? Really wonder why they were installed up-side down.

Bill Dane 99 Allure 30326

Re: Hot water lift pump

Reply #1 –
Yahoo Message Number: 82087
Bill,

I reported on a similar pump failure about a month ago. On July 4th we were stranded with engine derating due to coolant loss. The pump had failed and spewed coolant on the highway. I had Cummins West of West Sacramento remove the pump and install a connector hose to bypass. They did all the work from beneath the engine. They did not remove the bedroom engine cover. The charge was about $500 so I am guessing it took them about three man hours plus a few minor parts plus anti freeze that I had lost all over Highway 50. I may have attempted the job myself if I had a place to work and the air temperature would have been less than 101 degrees with humidity about the same!.
Many on the forum agreed that this "school bus" pump is problematic and would fail again if replaced. They all agree that bypass is not a problem as there is another pump pulling up forward. In my experience with hydraulics in a closed circuit, it does not matter if you are pulling or pushing; the resulting circulation should be the same (barring cavitation, of course).
BTW, their labor rate is a bit high but competance and customer service is very good.
This is just a wild guess but, I imagine that the CC engineers felt that the front pump would need an assist because of the distance traveled. So, they added another pump in the engine comptartment. Maybe someone else here can shed some light on that theory.
.

Anyway, the fix is working fine.
Daron Hairabedian, 98 Allure, 30226

 

Re: Hot water lift pump

Reply #2 –
Yahoo Message Number: 82091
Removed mine 3 years ago after the third failure. No problems. Still get some heat from dash heater.

Dean

95 Magna 5280