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04-14-2018, 06:02 PM
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#29
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Senior Member
Nor'easters Club Holiday Rambler Owners Club
Join Date: Oct 2016
Location: Monadnock Region of New Hampshire
Posts: 1,519
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Quote:
Originally Posted by RustyTools
Tried replacing the filters by doing it the 'correct way' (ie, dry) on my Camelot and previous Endeavor (both had ISL400 engines). Never could get it to work. Went to prefilling and they always started right up. ...
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Funny how we have this 'correct way' of not prefilling with fuel, and yet my new filters had pictures on how to install and the picture clearly shows you should pre-fill the filter with fuel! 
FWIW, I will always pre-fill, with clean fuel, carefully into the right place. All the engines/filters I've ever done the fuel flows from the outside to the inside. So you fill from the outside only, not allowing anything to go into the inside hole.
__________________
My name is Peter, and I'm never going to grow up.
- Winnebago Era 2010 Class B
- Holiday Rambler 2006 Ambassador 40-DFD Class A
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04-14-2018, 06:12 PM
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#30
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Moderator Emeritus
Newmar Owners Club
Join Date: Apr 2014
Location: Southern Indiana
Posts: 19,417
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Just changed mine today. Installed dry after several times turning lift pump on.
Engine started right up. This is my 3rd filter change and use the same method like the manual stated.
I could see where a weak lift pump might make this a problem.
For me installing dry is a little easier with all the hoses and wiring I have to navigate the filter thru.
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Steve
2002 Newmar Mountain Aire 4095
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04-15-2018, 06:29 PM
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#31
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Senior Member
Join Date: Jul 2011
Location: Naples, Florida & Cape Cod, Ma,
Posts: 547
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Changed my filters yesterday, filled both filters with fuel, with clean new diesel, filled to the top in the center opening, started with no issue.
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04-19-2018, 07:54 PM
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#32
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Junior Member
Join Date: Mar 2017
Posts: 22
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Thanks to all contributors on this thread, I prefilled my fuel filters and the darn thing started. This is the 4th time I've changed fuel filters, but the first time I installed them "wet".
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10-28-2018, 11:02 PM
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#33
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Member
Join Date: Jan 2018
Posts: 60
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Manufacturers manuals for a reason?
In my Operation and Maintenance Manual, ISC Engines it says on page 5-11
in bold letters and triangles above:
"CAUTION
The ICS has a self-priming, low pressure system that purges the air from the system. Do not prefill the fuel filter. Prefilling the fuel filter can cause pump damage."
I don't know what fuel pump they are talking about, the transfer or the injection pump($4000 Replacement). 
Today was my 1st time changing both filters and it did take me a half dozen attempts to start dry over 20 minutes.
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10-29-2018, 04:19 AM
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#34
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Senior Member
Join Date: Jul 2014
Posts: 35,446
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You can't see the contamanints, in " good clean fuel ", that will damage the high pressure injector pump.
Most secondary filters block 10 microns or more, some filter down to 2 microns.
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10-29-2018, 06:34 PM
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#35
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Senior Member
Join Date: Nov 2006
Location: Grayson, GA
Posts: 905
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Don't prefill ISC fuel filters
Quote:
Originally Posted by Saf
In my Operation and Maintenance Manual, ISC Engines it says on page 5-11
in bold letters and triangles above:
"CAUTION
The ICS has a self-priming, low pressure system that purges the air from the system. Do not prefill the fuel filter. Prefilling the fuel filter can cause pump damage."
I don't know what fuel pump they are talking about, the transfer or the injection pump($4000 Replacement).
Today was my 1st time changing both filters and it did take me a half dozen attempts to start dry over 20 minutes.
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After installing the filter(s), turn the ignition key to the "on" position but, do not attempt to start --- you can hear the fuel lift pump working if you are at the back of the motor home. When it stops, turn the key off and repeat this procedure about 6 - 7 times. This should purge your fuel filters and lines of air. Then attempt the start --- if it does not start, repeat the above instructions for about 4 - 5 more times and then attempt the start -- it should start as normal at that time.
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Dave and Karen -- '02 Ultimate Advantage 36 C, 350 HP Cummins, Allison 3060 Tranny, 2013 Ford Edge, InvisiBrake
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10-30-2018, 01:27 AM
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#36
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Member
Join Date: Jan 2018
Posts: 60
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Thank you. I did each time run the transfer pump till it shut off at about a minute but only 3 times, maybe next time I'll try 7.
Quote:
Originally Posted by David K
After installing the filter(s), turn the ignition key to the "on" position but, do not attempt to start --- you can hear the fuel lift pump working if you are at the back of the motor home. When it stops, turn the key off and repeat this procedure about 6 - 7 times. This should purge your fuel filters and lines of air. Then attempt the start --- if it does not start, repeat the above instructions for about 4 - 5 more times and then attempt the start -- it should start as normal at that time.
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10-30-2018, 02:51 PM
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#37
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Moderator Emeritus
Monaco Owners Club Texas Boomers Club
Join Date: Nov 2015
Location: Central Texas
Posts: 13,426
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Quote:
Originally Posted by David K
After installing the filter(s), turn the ignition key to the "on" position but, do not attempt to start --- you can hear the fuel lift pump working if you are at the back of the motor home. When it stops, turn the key off and repeat this procedure about 6 - 7 times. This should purge your fuel filters and lines of air. Then attempt the start --- if it does not start, repeat the above instructions for about 4 - 5 more times and then attempt the start -- it should start as normal at that time.
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Mine will start after four key cycles.
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Dennis and Katherine
2000 Monaco Dynasty
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05-19-2021, 11:20 AM
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#38
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Senior Member
Join Date: May 2019
Posts: 213
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I had this problem today except my engine started on the first attempt then died after 30 seconds. Prior to starting the engine I did 3-4 runs of the lift pump.
From that point, it would not start despite running the lift pump 3-4 more times. I did not make any further attempts to start it because I wasn't sure what would or would not damage the CAPS lift pump, etc...
I saw in another post about repeating the procedure of running the lift pump several times and attempting to crank the engine 6-7 times over 20 minutes.
How much is too much?
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05-19-2021, 11:23 AM
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#39
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Senior Member
Join Date: Oct 2014
Posts: 7,882
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Cycle the key (not turning far enough to engage starter) until the pump RPM goes from high (pumping air) to slower (pumping fuel.
Only then try to start it.
If the level of fuel in the tank was lower than the filter head and you did not have a ball valve on the primary filter to keep fuel from siphoning back to the tank, you may have 30'+ of AIR in the fuel line. That will take awhile to clear.
__________________
Brett Wolfe
Ex: 2003 Alpine 38FDDS. Ex: 1997 Safari Sahara. Ex: 1993 Foretravel U240
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05-19-2021, 11:30 AM
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#40
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Senior Member
Join Date: May 2019
Posts: 213
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Quote:
Originally Posted by wolfe10
Cycle the key (not turning far enough to engage starter) until the pump RPM goes from high (pumping air) to slower (pumping fuel.
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Thank you.
I have 30 seconds to get to the back of the motorhome to listen for the lift pump, correct?
I didn't think of the fuel level. I am at 1/4 tank. My single filter is remote mounted under my battery tray. Thanks for mentioning that.
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05-19-2021, 11:38 AM
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#41
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Senior Member
Join Date: Oct 2014
Posts: 7,882
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Quote:
Originally Posted by DSBill
Thank you.
I have 30 seconds to get to the back of the motorhome to listen for the lift pump, correct?
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Sure easier with two people. Hopefully you can recruit someone with enough technical ability turn the key on and off!
__________________
Brett Wolfe
Ex: 2003 Alpine 38FDDS. Ex: 1997 Safari Sahara. Ex: 1993 Foretravel U240
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05-19-2021, 11:52 AM
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#42
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Senior Member
Join Date: May 2019
Posts: 213
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Quote:
Originally Posted by wolfe10
Sure easier with two people. Hopefully you can recruit someone with enough technical ability turn the key on and off!
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Yeah, biggest lesson learned has been to never buy a motorhome when you're a 30 minute drive to where you have to store it. I will to have to draft my better half on the trip out there tomorrow.
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