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Old 07-15-2018, 10:45 AM   #1
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Hi everyone,

I am new to this site. My husband and I have an 2005 Monaco Diplomat. It is a diesel pusher. Loving it! But we started having problems with loss of power. We changed 2 fuel filters several times and it would work again but between 70-100 miles it would act up again. Took it to Cummins and they just did the same thing we did and test drove for 90 miles whiteout issues. On the way home once again had the same issue. Anyone have any other troubleshooting ideas? We are frustrated and stumped.

Love to hear some feedback. Thanks!
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Old 07-15-2018, 11:37 AM   #2
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Sounds kinda dejavu for me! You may have had the kind of luck I had when I picked up a bad load of fuel. Did Cummin's check the filter they took off for contaminants? The 12 successive filters I changed out had less and less "black sand"(dead Algae) until it was all worked out of the system. You should have your fuel tank checked for Algae and treat the fuel with an additive like Biofor. the worst case scenario may be having to have the fuel tank drained and cleaned.
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Old 07-15-2018, 11:44 AM   #3
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Glad to have you here in the forum with us. You're gonna like it here.

I agree that you have probably pick up a bad load of fuel. Changing filters will only alleviate the problem until hey get plugged up again. I guess in your case that is about 100 miles. You need to have the tank checked for contaminants. This is one of the reasons I always fill my tank at big truck stops where I know the fuel is fresh.

Happy Trails!!!
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Old 07-15-2018, 07:13 PM   #4
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Hi ! Welcome to IRV2! We're sure glad you joined the gang!

Sorry, can't help with that.


Good luck, happy trails, and God bless!
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Old 07-15-2018, 07:17 PM   #5
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Welcome. Sorry I can't add anything else other than a fuel problem


Good luck
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Old 07-16-2018, 04:11 AM   #6
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Thanks for the insight. The mechanics changed the filters but to look at those filters they were clear. It is so baffling. But thank you. I will keep everybody posted on what happens. ��
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Old 07-20-2018, 11:36 AM   #7
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from Alaska!
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Old 07-21-2018, 06:35 AM   #8
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Update everyone!
We found the mystery! There is something called a heat shield that has something to do with the PAC brake. Apparently it was broken so every time the PAC brake was engaged, it would act as a damper to the exhaust and would cause it to act the way it did. Crazy!! Thanks everyone for the help and suggestions. Happy travels����
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