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Old 08-20-2017, 12:24 PM   #1
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Cummins ISB275 fuel/water seperator

I know this is an old subject but I just changed this filter. I filled it about 1/3 w fuel only because I ran out; put it on the mount and turned the key 3 times to prime. The engine then started, ran about 30 seconds and died.I am aware of the air in the fuel line problems so I loosen the 5/8 screw on the bottom of the filter and could see a lot of air bubbles. When this stopped I again tried to start the engine but no go!
Any suggestions at this point would be greatly appreciated.
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Old 08-20-2017, 01:11 PM   #2
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Mechanical pump or electronic fuel system?
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Old 08-20-2017, 10:18 PM   #3
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Turn the key to on but not to activate the starter. This powers the fuel pumps. You should hear the pump/s running for a few seconds. Do this three too five times then turn the ignition switch and activate the starter.
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Old 08-21-2017, 06:29 AM   #4
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I suppose it's mechanical; on a 1999 Bounder39Z
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Old 08-21-2017, 06:30 AM   #5
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Did the turn the key thing several times, no luck
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Old 08-21-2017, 06:42 AM   #6
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If it is a Cummins ISB 24 valve, it is an electric pump.
The post to click the starter key but not start the motor is the correct method to primp the engine.
However it maybe necessary to crack one or two of the connectors to the injectors to bleed the system.
I work on our ISB and when changing filters it is usually necessary to bleed the fuel system. Just one of those things.
Regards,
JimB
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Old 08-21-2017, 08:03 AM   #7
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Turn key 30 seconds on then 30 seconds off. Do this 4-5 times and system should be purged.
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Old 08-21-2017, 09:51 AM   #8
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Next time fill your filters. Full. Life will be a lot easier.
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