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Old 10-03-2021, 10:40 PM   #1
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What filter to change first

On our 2003 Safari Sahara ISC 8.3 that has two fuel filters.They are side by side FS 1022 and FS 19551, does it make a difference which one I change first?
I do start it after I change each one.
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Old 10-03-2021, 11:07 PM   #2
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I never even thought about it - just changed them both, then started it up. Am I missing something here?
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Old 10-04-2021, 07:49 AM   #3
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When I first bought our coach I followed the instructions that said to change the primary filter first (no prefill), cycle the key ~4-5 times and start the engine and let it run, then do the same with the secondary filter. Cycling the key runs the transfer pump to fill the filters.

Back ~7 years ago I did this and the engine would not start after tried multiple time and finally had to put air on the tank to pressurize and get the rig to start.


Since then, up until earlier this year, I just pull the old filter, put a plug in the center hole of the new filter, fill with fuel, remove plug, install filter, cycle the key and start.





But my fuel transfer pump started to leak so I just bit the bullet and installed a FASS transfer pump completely eliminating the old transfer pump with no need to prefill the filters.
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Old 10-04-2021, 09:15 AM   #4
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Change your primary water separating filter first, run the engine a few minutes, then change the secondary fuel filter.

What part numbers does your owners manual say for filters?

Sounds like you are running two water separating filters (FS).
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Old 10-04-2021, 09:20 AM   #5
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Yes, it might be SLIGHTLY better to change the primary first, then secondary. But, most of us change both at the same time and then prime.



And, with your engine, install them DRY. Then cycle the key to activate the electric fuel pump. It will run for around 30 seconds each time you cycle the key. Really easy to tell when it is primed, as the pump RPM goes from fast (pumping air) to slow/normal speed (pumping fuel). With one person back by the engine/filters and the other turning the key, this is a "no brainer" process. Running the engine is NOT needed to prime. Sure, after using the key to activate the electric fuel pump, start it up.
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Old 10-05-2021, 02:28 PM   #6
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[QUOTE=96 Wideglide;5938036]Change your primary water separating filter first, run the engine a few minutes, then change the secondary fuel filter.

What part numbers does your owners manual say for filters?

]Sounds like you are running two water separating filters (FS)
==========================================
FRAM PS7170 Fuel Filter is the other filter that I use,It does not have the clear bowl on it.The primary filter is the FS 1022 .
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Old 10-05-2021, 04:43 PM   #7
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Yeah, those are both water separating filters.

Not all WS filters will have a glass bowl. Usually will have a drain on the bottom. Mine has no glass bowl.

Likely not hurting anything, but most water separators are only filtering to 10 micron. Fuel filters (FF) will filter much finer. I run a 5 micron fuel filter, behind a 10 micron water separating filter.
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