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Old 08-31-2015, 07:50 PM   #1
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Lift pump leaking

I started the coach today and noticed the lift pump was leaking.This was the second time that I have had this issue.The first time was around three years ago and the problem was the same this time.
The three 11mm bolts,two of them were loose. I wounder how many people had there pump replaced due to just loose bolts?

I cant find the torque setting and would like to know if anyone might happen to know it?
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Old 08-31-2015, 09:27 PM   #2
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I replace my Transfer pump (Per Cummins) two weeks ago. I had tighten the bolts a couple of times over the years. I guessed at the torque since Cummins does not recommend you tighten the bolts.

It took about three hours to replace the pump, because of the 100 + degree weather and high humidity. I also had to crawl off the engine a few times to get the correct tool.

When I purchased the Transfer Pump I asked about a replacement gasket and I was told I they do not sell service parts for the pump. I was told that the replacement was a new and improved model for the New Diesel Fuels.
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Old 08-31-2015, 09:59 PM   #3
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So Cummins sells the pump but no gasket, that does not make sense?


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Old 09-01-2015, 11:14 AM   #4
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Quote:
Originally Posted by Dave Fernandez View Post
I replace my Transfer pump (Per Cummins) two weeks ago. I had tighten the bolts a couple of times over the years. I guessed at the torque since Cummins does not recommend you tighten the bolts.

It took about three hours to replace the pump, because of the 100 + degree weather and high humidity. I also had to crawl off the engine a few times to get the correct tool.

When I purchased the Transfer Pump I asked about a replacement gasket and I was told I they do not sell service parts for the pump. I was told that the replacement was a new and improved model for the New Diesel Fuels.
I have kept an eye on the pump ever since the first leak and I'll wait and see how it goes.
Dave, do you have the part # and cost for your new transfer pump? This has been the only mechanical issue I've had since owning this coach and I have been very pleased with this 2003 model.
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Old 09-01-2015, 02:46 PM   #5
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Jim since Cummins goes by Engine Serial Number it is better that you take the Ser # to Cummins for the Correct Part. The Cost was $390.00 with Cummins Power Club 10% Discount and the parts included replacement fittings, O Rings and Banjo Fitting seals. I am glad I purchased the extra fittings because one was damaged when I tried to remove the old on from the pump.



I found that it easier to loosen the old fittings while the pump is bolted to the engine be for removal.
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Old 09-01-2015, 03:01 PM   #6
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Quote:
Originally Posted by Dave Fernandez View Post
Jim since Cummins goes by Engine Serial Number it is better that you take the Ser # to Cummins for the Correct Part. The Cost was $390.00 with Cummins Power Club 10% Discount and the parts included replacement fittings, O Rings and Banjo Fitting seals. I am glad I purchased the extra fittings because one was damaged when I tried to remove the old on from the pump.



I found that it easier to loosen the old fittings while the pump is bolted to the engine be for removal.
Thanks for the info Dave.
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Old 09-05-2015, 10:12 PM   #7
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I had a similar problem recently and found and after some research I found the 3 bolts were relatively loose.
I snugged them up and it stopped leaking.
I was thinking this as the problem solved.
Should I be considering replacing this pump?
I found that the lift pump ran for about a minute, which I understood primed the injector pump.
Everything seems to be working well.
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Old 09-06-2015, 10:04 AM   #8
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Lift pump gasket part #4928511

This problem started january 1, 2005, when they changed the fuel to ultra low sulfur diesel. The older lift pumps, I believe was not designed for the new fuel. Cummins new lift pump was redesigned to use the new fuel. I think thats why they do not support the old pump. In March, of 2010, I went to Cummins, to purchase a new lift pump gasket, part #4928511. The parts dept said they had the gasket but this part was discontinued. I bought 4 gasket at the time for $5.28 ea. I have since used 2 of these gaskets. For me its easy to change the lift pump gasket from the top. I think you would have to replace the old pump with a new pump to permanently solve this problem. I have 150,000 miles on my coach.
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