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Old 09-04-2015, 01:56 AM   #1
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Diesel running bad

Just bought a 2006 Damon Astoria (20250 miles) with 300 hp Cummins. Filled up fuel in AZ for the trip home to California, about 210 miles. Ran great for about 100 miles. at this point, engine acted like it looseing power and would not accelerate. Stopped several times and shut it off. At restart it ran ok for a while. I am going to change oil, filter, fuel filter, air cleaner filter.I bought it from a dealer who has had it on his lot for close to a year. Could the fuel just be bad? Do I need to do anything else? First diesel so any and all suggestions will be appreciated.
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Old 09-04-2015, 06:21 AM   #2
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Look for an inline filter before the lift pump. I had the same problem with a similar mileage MH last month. The filter will be inside the frame rail between the fuel tank and lift pump.

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Old 09-04-2015, 07:10 AM   #3
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Algae in fuel? Start changing fuel filters. It may take several and you may need to treat the fuel. Do a search for Algae in diesel.
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Old 09-04-2015, 07:45 AM   #4
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X2 on the fuel filters, I had a bout of algae in my tanks and it nearly clogged the top of the primary fuel filter with black slime.

When I know the coach will be parked for a period of time I always make sure the tank is full to reduce condensation. I then add a maintenance dose of BioBor. I will also add Startron Enzyme treatment which is suppose to breakdown the dead algae.

If you have algae you will have to dose the system with a higher level of treatment.

I carry extra filters but never had to replace on the road.
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Old 09-04-2015, 11:36 AM   #5
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Don't overthink it until you've changed the primary fuel filter at least once. Probably something like 80% of the time these symptoms will be nothing more than a dirty fuel filter.
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Old 09-04-2015, 12:21 PM   #6
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Before it sat on the dealer's lot for "almost a year", how long did it sit at the owner's house? The rig should have been given a COMPLETE service job to insure your investment. I would not trust the dealer as far a I could throw him for doing this. It's your investment; it's your responsibility. Get Freightliner or some other reputable business to service the whole chassis, engine, fuel delivery system, etc., etc. You will find out what the problem is.

Travel safe & good luck.
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Old 09-04-2015, 12:30 PM   #7
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Loosen fuel cap. Something may have moved into the vent holes and plugged them. Diesel of this vintage can't stand pressurized fuel tank.
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Old 09-04-2015, 12:48 PM   #8
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Quote:
Originally Posted by JumboJet2 View Post
Look for an inline filter before the lift pump. I had the same problem with a similar mileage MH last month. The filter will be inside the frame rail between the fuel tank and lift pump.

I gotta say, that appears to be one lousy way of mounting a fuel filter. And, based on the experiences of many of you with the same type/style of fuel filter, did any of you rep-mount it for better access and an easier change? I don't have one like that. Our coach, an '04 Itasca Horizon 36GD with the C-7 330HP CAT, has a single fuel filter at the back of the radiator which, is not too bad or, accessible for maintenance.
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Old 09-04-2015, 02:08 PM   #9
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Originally Posted by FIRE UP View Post
I gotta say, that appears to be one lousy way of mounting a fuel filter. And, based on the experiences of many of you with the same type/style of fuel filter, did any of you rep-mount it for better access and an easier change? I don't have one like that. Our coach, an '04 Itasca Horizon 36GD with the C-7 330HP CAT, has a single fuel filter at the back of the radiator which, is not too bad or, accessible for maintenance.
Scott
That is actually a Racor inline screen strainer before the lift pump. The actual Fleetguard Filter/Water Separator is between the lift pump and injection pump.

YES, I moved that strainer where it is more accessible but still inside the frame rail. It now sits behind the rear axle instead of in front of it. I also added a shutoff valve so I can change filters without taking a bath in a quart or so of #2 diesel fuel.
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Old 09-04-2015, 07:41 PM   #10
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X2 on that strainer filter, a friend of mine has a Astoria and was having the same issues
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Old 09-04-2015, 07:59 PM   #11
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Change the fuel filters first and treat the tank at each fill up with Biobor.
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Old 09-04-2015, 08:11 PM   #12
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I have a 2007 with a 300 Cummins. Last year I filled up and about 300 miles later I started having the same problem. I changed approx. 5 filters over a 6 month period. Each time I would go further before engine started miss firing and sputtering. I purchased some filters at Orielly and some on the internet, I keep several spare fuel filters with me at all times. I also keep a 1 gal can of diesel to prefill the filters.
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Old 09-05-2015, 02:25 AM   #13
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Thank you everyone for the quick and great information. I am going to do "all of the above" and try to get in front of this. I will be posting more as things get better (or worse). I hope to see some of you on the road.
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Old 09-05-2015, 07:42 AM   #14
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I also moved the Racor strainer to a more accessible location.
Cummins says you do not have to prefill the filter on a 300 hp 5.9l because tgey use a lift pump,just cycle the key a few times to let them fill.


This is what I do now and it works fine


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