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Old 10-07-2016, 04:35 PM   #1
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Onan/Cummins fuel leak at injector pump

I have an Onan 8.0kw generator model MDKD. It has a 3cyl. Cummins diesel.
There is fuel seeping from the base of the delivery valve fittings that thread into the top if the injector pump.
I have read posts on this repair to larger engines but I am looking for advise from someone familiar with a small 28 year old Cummins 3cyl.
I already ordered the o ring and gasket for the three delivery valves from the factory.
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Old 10-07-2016, 05:09 PM   #2
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Orings can be replaced with pump in place using good dexterity and cleanliness. Done several of these.
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Old 10-07-2016, 07:38 PM   #3
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Could you let me know what to expect after I remove the fuel line and screw the fitting out of the pump. The parts breakdown shows springs and I have this fear that things may come apart and shoot around the e/r.
Also, do you replace both the o ring and gasket?
O ring part# 185-5869
Delivery valve gasket part# 185-2196
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Old 10-09-2016, 09:43 PM   #4
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I had the exact same issue. Order the O-rings from Cummins. They are about $10 each. Yes there are springs just take your time. BTW I no longer have any leaks
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Old 10-11-2016, 12:34 AM   #5
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Did you replace the o rings only?
I purchased the o rings and gaskets but I am not sure if I need to do both.
I am not sure where the gasket fits by looking at the parts breakdown.
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Old 10-11-2016, 01:19 PM   #6
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Quote:
Originally Posted by Steveg353 View Post
Did you replace the o rings only?
I purchased the o rings and gaskets but I am not sure if I need to do both.
I am not sure where the gasket fits by looking at the parts breakdown.
Mine was seeping from under the "B nuts" and once I replaced the O rings the leaks stopped. This seems to be a common issue with this model as the O rings dry up and become brittle, thus they start leaking.

Take a look here.

Onan 8KW Annual Maint and More
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