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Old 09-24-2013, 08:03 PM   #1
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Rexhall Owners Group
Join Date: Dec 2009
Posts: 337
ISX Fuel filter question

I have a Cummins ISC in my RV and have changed the fuel several times. I need to help a relative change a fuel filter on a ISX. Changing the filter is fine but do you prime the filter the same way as the ISC (key on and off multiple times). What is the correct procedure? Thanks
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Old 09-25-2013, 11:03 AM   #2
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I would suggest filling fuel filter with diesel. Plug center hole so diesel being poured in has to go around small holes which means fuel will be filtered. Some people are having problems even when they recommend putting filter on dry started. Tom ISM Engine
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Old 09-25-2013, 10:46 PM   #3
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If u pre fill make sure u plug center. I small particle of dirt in fuel system can cause an injector to stick which is not covered under warranty. You can key on off but you can crank engine to prime just do not crank on starter more than 30 seconds on 30 seconds off for three on cycles then 5 min rest
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