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03-17-2015, 08:32 AM
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#1
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Member
Join Date: Aug 2013
Posts: 53
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Cummins 400 ISL bucking
Anyone have an issue with diesel bucking under acceleration? Just started. Thinking filters. Took it to Cummins yesterday and now waiting to hear.
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03-17-2015, 08:36 AM
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#2
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Senior Member
Newmar Owners Club
Join Date: Oct 2009
Posts: 10,310
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Most likely is the filter's, fuel pump starving under a load will cause what you are feeling........
__________________
2012 Essex 4544 2011 Jeep JK, M&G Braking, 2014 MTI 27' Hog Hauler, Wireless brake control, 2006 Ultra & 1989 Springer, 2003 Harley-Davidson
FLHR Road King Anniversary
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03-17-2015, 09:26 AM
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#3
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Senior Member
Join Date: Mar 2012
Location: Palmer Ak
Posts: 1,136
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Is this an engine issue or a transmission issue? How does the engine run/idle/no load rpms? I would be looking for the 'simple things' first and change the fuel filters, if it has been a while since they were changed.
Keep us posted as to what the issue is!
__________________
2009 38' Diplomat
CSM- retired, wife as co-pilot
Reka & Ali providing security (our 2 labs)
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03-18-2015, 09:54 AM
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#4
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Member
Join Date: Aug 2013
Posts: 53
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Cummins Bucking
We had our call back from Cummins here in Houston yesterday. It was the fuel pump with a small crack. Have no idea how old it is because we have only had the coach for a year and a half. We are replacing it and the fuel filters. They say that the engine is in great shape...always good to hear. So, this should solve that problem and we'll be off and running again by tomorrow. Whoohoo! 
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03-18-2015, 10:32 AM
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#5
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Senior Member
Texas Boomers Club
Join Date: Dec 2003
Location: Mo/Texas
Posts: 3,555
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Quote:
Originally Posted by Gayleross
We had our call back from Cummins here in Houston yesterday. It was the fuel pump with a small crack. Have no idea how old it is because we have only had the coach for a year and a half. We are replacing it and the fuel filters. They say that the engine is in great shape...always good to hear. So, this should solve that problem and we'll be off and running again by tomorrow. Whoohoo! |
What year is your MH?
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03-18-2015, 12:51 PM
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#6
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Senior Member
Newmar Owners Club
Join Date: Oct 2009
Posts: 10,310
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Quote:
Originally Posted by Gayleross
We had our call back from Cummins here in Houston yesterday. It was the fuel pump with a small crack. Have no idea how old it is because we have only had the coach for a year and a half. We are replacing it and the fuel filters. They say that the engine is in great shape...always good to hear. So, this should solve that problem and we'll be off and running again by tomorrow. Whoohoo! |
Some times I just cringe when I read post like this  I would think if the fuel pump was/had a crack in it , it would of been spray/leaking fuel and you would of seen it or smelled it for sure. Fuel stinks! I would want to go and have a look see at the old pump, as I would imagine the cost of this repair is not cheap? Just my thoughts and it never hurts to question the people that are working for you and spending your money. Safe travels 
__________________
2012 Essex 4544 2011 Jeep JK, M&G Braking, 2014 MTI 27' Hog Hauler, Wireless brake control, 2006 Ultra & 1989 Springer, 2003 Harley-Davidson
FLHR Road King Anniversary
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03-20-2015, 07:32 AM
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#7
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Registered User
Join Date: Sep 2011
Posts: 1,510
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Quote:
Originally Posted by palehorse89
Some times I just cringe when I read post like this I would think if the fuel pump was/had a crack in it , it would of been spray/leaking fuel and you would of seen it or smelled it for sure. Fuel stinks! I would want to go and have a look see at the old pump, as I would imagine the cost of this repair is not cheap? Just my thoughts and it never hurts to question the people that are working for you and spending your money. Safe travels |
I agree with Palehorse. It may be a bit late, but it's always good to have anyone repairing your coach (or car) to give you the "defective" part. A "crack" in a "fuel pump", unless it was the injection pump itself, seems a bit unlikely to have caused your problem. Inexpensive fuel filters, however, are the culprit 95% of the time.
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03-21-2015, 07:25 AM
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#8
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Member
Join Date: Aug 2013
Posts: 53
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Its a 2004 Monaco Dynasty
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03-21-2015, 07:27 AM
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#9
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Member
Join Date: Aug 2013
Posts: 53
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The replacement was to the Lift Pump. We have a Cummins ISL 400 with a common rail.
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03-21-2015, 12:12 PM
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#10
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Senior Member
Texas Boomers Club
Join Date: Dec 2003
Location: Mo/Texas
Posts: 3,555
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Quote:
Originally Posted by Gayleross
Its a 2004 Monaco Dynasty
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Ours started doing the same thing several months after we got it. Our lift pump was leaking from the gaskets being effected by the "new" diesel fuel and yes, it was very evident from looking underneath the engine. Our original oem pump and the fuel filter both also had evidence of gunk in them from contaminated fuel. Ran fine after that.  BTW, if you have just (1) combo fuel/water separator filter, might want to consider having an additional filter added. Several manufactures went from having (2) filters down to (1) back in that general time frame. 
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