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Old 06-21-2021, 06:51 PM   #1
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Coach seems down on power

2009 mountain aire with a 450 ISM cummings, Traveling from Moab into Colorado coach seemed down slightly down on power, Max boost uphill under full load was 29 psi. Is this normal boost psi or should it be higher?
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Old 06-21-2021, 06:56 PM   #2
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When were the fuel filters changed, if you don't know this would be the first thing to try.
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Old 06-21-2021, 07:09 PM   #3
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Fuel filters are not that old. was wondering if boost psi seemed low
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Old 06-21-2021, 07:26 PM   #4
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That’s same boost I was getting when above 8000ft altitude, I believe it’s normal as I get the normal 34 psi when I get lower in altitude.

Higher altitude = less air to compress
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Old 06-21-2021, 07:44 PM   #5
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Thank you!!
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Old 06-21-2021, 08:45 PM   #6
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Sea Foam

Wouldn't hurt to run a tank of Sea Foam through it it will clean out your injectors.
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Old 06-24-2021, 05:12 AM   #7
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All it takes is one bad fillup to ruin filters....
good luck and let us know the fix !
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Old 06-24-2021, 05:35 AM   #8
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All it takes is one bad fillup to ruin filters....
good luck and let us know the fix !

When suspecting a fuel filter should you let a little fuel out to see if there is water in the water seperating fuel filter?
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Old 06-24-2021, 09:52 AM   #9
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Quote:
Originally Posted by okcnewbie View Post
When suspecting a fuel filter should you let a little fuel out to see if there is water in the water seperating fuel filter?
Can't hurt, but a "bad filter" situation usually is from clogging of the filter element, not from water in the fuel mix. You could find absolutely no water from the filter drain yet the filter is clogged and not allowing a full flow of fuel.
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Old 06-24-2021, 10:00 AM   #10
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Larry is correct.


But, draining a small amount COULD tell you if there is water, dirt or ALGAE (black slime) in the filter.


Agree, if only clean diesel comes out of the primary filter drain that is not 100% proof that the filter is not clogged, but if any of the above come out, you can bet the filter IS clogged.
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