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Old 11-12-2016, 10:33 PM   #1
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Onan shuts down when load is applied. Diesel 7500

2004 with 4400 hrs. I changed oil (to synthetic ) fuel and air filters last week. Worked numerous times but now it starts normally and when the load ramps up to 12 amps more or less, SOMETIMES it abruptly dies.

An attempt to resart within a minute just turns it over but doesn't start. (MAYBE THE FUEL PUMP?) Waitings 5 minutes, it'll start and usually carry the load forever.

???
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Old 11-16-2016, 07:04 PM   #2
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Get the manual and look for trouble code on read out, better than guessing.
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Old 11-16-2016, 07:38 PM   #3
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Slight air leak in the filter or lines, since the filter change.

The fuel drains back while sitting.

When you first start it, it runs on the fuel in the pump. During the restart the prime is restored.

Check the filter gaskets and fuel line connections. Make sure they are tight.
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Old 12-09-2016, 04:48 AM   #4
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Quote:
Originally Posted by twinboat View Post
Slight air leak in the filter or lines, since the filter change.

The fuel drains back while sitting.

When you first start it, it runs on the fuel in the pump. During the restart the prime is restored.

Check the filter gaskets and fuel line connections. Make sure they are tight.
I think your diagnoses was correct. I re-tightened the fittings and it is operating normally. Thx
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Old 01-02-2017, 11:52 PM   #5
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Update: i had been in RV parks and wasn't using the genny much but now I'm on the road and found the shutdown problem persists. I replaced the fuel pump today and the problem seems to be solved.

An RV supply store here in Quartzsite had a Onan pump for $82. Not a bad price for an OEM.
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