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03-19-2016, 05:59 PM
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#1
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Junior Member
Join Date: Nov 2010
Posts: 26
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Fuel Filter
Can anyone tell me how to prime the fuel system on my 2001 Dynasty after changing the fuel filter on the side of the road. I didn't have any diesel to fill the new filter with.
Thanks in advance
Dave
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03-19-2016, 06:05 PM
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#2
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Senior Member
Fleetwood Owners Club
Join Date: Jun 2009
Posts: 4,031
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The engine is what make & model?
You don't have a toad?
__________________
99 Discovery 34Q ISB
2014 MKS AWD EcoBoost Toad
Fulltime Since "99"
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03-19-2016, 06:07 PM
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#3
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Senior Member
Newmar Owners Club
Join Date: Oct 2009
Posts: 10,308
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Assuming you have a Cummins, cycle the ignition key to the on position(Not rolling the engine) for 3 minutes or so, then turn the key to the off position, repeat for 6-10 times, the lift pump will fill the filter.
__________________
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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03-19-2016, 06:24 PM
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#4
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Junior Member
Join Date: Nov 2010
Posts: 26
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No toad on this trip. I actually loaned my coach to a good friend of mine, who is now 8 hours away from me and I am trying to help him through this problem over the phone.
I will tell him to try what palehorse89 suggested.
Thank you again.
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03-19-2016, 07:07 PM
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#5
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Junior Member
Join Date: Nov 2010
Posts: 26
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He has tried that, the coach ran for about 30 seconds and then shut off.
I was told that after he put the new filter on he tried repeatedly to start the coach. Could that have "trapped" air in the system? and if so, will doing the key on / off cycling purge that air out?
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03-19-2016, 07:34 PM
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#6
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Senior Member
Winnebago Owners Club Freightliner Owners Club
Join Date: Feb 2015
Location: BC
Posts: 164
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If you turn the key on and "bump" the starter the lift pump will run about 30 seconds. Turn key off and bump the starter about 3 times, that should get the air out
__________________
1999 Winnebago Chieftain
1992 Jeep YJ
1984 Harley Liberty edition
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03-19-2016, 08:16 PM
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#7
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Senior Member
Monaco Owners Club
Join Date: Jun 2014
Posts: 14,455
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I had the same problem last time I changed fuel filters in my driveway after doing a complete service. Never had a problem like this before, I had always changed my filters without prefilling.
Ultimately I had to put compressed air on the tank for the fuel to be pushed to the injector pumps.
One option may be to loosen the fuel filer, cycle the key until fuel starts pouring out the top, the tighten the filter. Then cycle the key on an off and then try starting the engine.
__________________
Jim J
2002 Monaco Windsor 38 PKD Cummins ISC 350 8.3L
2005 Jeep Grand Cherokee w/5.7 Hemi
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03-20-2016, 05:40 AM
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#8
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Senior Member
Newmar Owners Club
Join Date: Oct 2009
Posts: 10,308
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Quote:
Originally Posted by jporietis
If you turn the key on and "bump" the starter the lift pump will run about 30 seconds. Turn key off and bump the starter about 3 times, that should get the air out
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You do not need to bump the starter, just turn the key to the "On" position, and the lift pump will run, mine runs for 3-4 minutes, then shuts off. If you go outside , if it is not to noisy, you will be able to hear it "Buzzing".
You would also be able to hear it from the bedroom. Maybe even open the bedroom engine access and make sure it is running!
The lift pump will push all the air out.
__________________
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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03-20-2016, 05:58 AM
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#9
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Senior Member
Join Date: Jul 2014
Posts: 35,317
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If you cannot prime it in the above stated fashion, you may have a problem with the lift pump or suction side plumbing.
Blowing the fuel to the tank may get you going but masks a problem.
If the lift pump is bad, it can lead to lower fuel flow.
The exess fuel that the lift pump supplies, and then returns to the tank, helps to keep the injector pump cool. When the injector pump runs fuel starved it overheats and can fail.
That is more expensive then a lift pump or a few loose hose clamps.
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03-20-2016, 08:02 AM
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#10
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Senior Member
Monaco Owners Club
Join Date: Oct 2010
Location: Colleyville, TX
Posts: 183
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Dave,
I had to help a fellow RV'r out a couple of years ago who was stranded in a campground after he had changed both fuel filters on a Cummins ISC350 diesel without pre-filling them. Unfortunately, the engine Started, but ran the system out of fuel and shut down.
The only way I could get him started was to go to a service station and buy some fuel and used the following process.
1. Removed both fuel filters and filled them with fuel, making sure that no fuel went into the center port, and then reinstalled.
2. Had the driver turn the key ON, (do not try to start) and let the lift pump run until it shuts off. Then turn the key OFF.
3. Again, remove both fuel filters, and refill with diesel fuel as noted above, because the lift pump will pull most of the fuel out of the filters when it is re-fueling the lines, lift pump and injection pump that were ran dry from the first attempt to start the engine after initially replacing his filters.
4. Repeat step 2 again
I had to remove and refill both filters as noted above, 3 times before I let him try to actuall restart the Cummins. The engine started, and coughed and sputtered a couple times, but kept running, and them smoothed out and ran perfectly.
The key issue is that once you run a diesel completely out of fuel, you must get all the fuel lines, lift pump, and injection pump completely re-filled with fuel and remove ALL the air that is in the fuel system or it will die again. If you continue to crank the engine with the components full of fuel, you will only burn up your starter.
Hope this helps your efforts to get the Cummins fired up again
Have a great day.
Jack
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03-21-2016, 08:03 AM
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#11
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Senior Member
Monaco Owners Club
Join Date: May 2013
Location: Citrus Heights Ca
Posts: 279
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All,
I replaced both of the filters on my ISC 330 yesterday without pre filling. I did what many have said simply turn the key to ON a few times and listen for the boost pump to turn off. Then repeat, once it stops coming on I start the coach. I started with the driver side filter first. Ran the coach for a few minutes then did the filter on the right. No need to pre fill. Hope this helps. If the coach runs and then shuts off, simply repeat the steps. Don't forget the small rubber gasket that goes on the threaded shaft of the filter mount. Take the old one off first of course.
Regards
__________________
Tom Hall
99 Windsor 38' SS 330 Cummins ISC
Tow Rig for Drag Car
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03-21-2016, 08:22 AM
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#12
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Senior Member
Join Date: Jul 2014
Posts: 35,317
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Quote:
Originally Posted by Tomjhall
All,
I replaced both of the filters on my ISC 330 yesterday without pre filling. I did what many have said simply turn the key to ON a few times and listen for the boost pump to turn off. Then repeat, once it stops coming on I start the coach. I started with the driver side filter first. Ran the coach for a few minutes then did the filter on the right. No need to pre fill. Hope this helps. If the coach runs and then shuts off, simply repeat the steps. Don't forget the small rubber gasket that goes on the threaded shaft of the filter mount. Take the old one off first of course.
Regards
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That is the proper way to do it.
I have never pre filled a fuel filter in a 40 year heavy equipment repair career.
If one day, that procedure does not work, something has changed and needs attention.
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