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Old 10-11-2014, 03:47 PM   #15
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I have a Onan 6500W gas Gen,I have put new plugs and wires,air filter, oil filter, new starter,new fuel filter. Had no problems until a few days ago. Gen will start, run for a minute then shut down. It acts as though fuel pump is acting up. Onan wants $120 and up for theirs, has anyone used a different, more economical one that works? All advice greatly appreciated. I ran a search on our forum with no results, very surprised.

Thom
Is it possible you have more than 1 fuel filter? Our older 5500 had a fuel filter at the carb and a second one near the pump. Onan has a kit out to eliminate the one at the carb.
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Old 10-11-2014, 06:04 PM   #16
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Not trying to sound stupid, but the pump is on the right hand side underneath the air filter, correct? If so, then I have but one.
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Old 10-13-2014, 09:23 AM   #17
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I looked up the 6500 generator drawings. It's much different than the 5500. I couldn't see a second fuel filter like the ones on the earlier 5500's.
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Old 10-13-2014, 09:27 AM   #18
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I looked up the 6500 generator drawings. It's much different than the 5500. I couldn't see a second fuel filter like the ones on the earlier 5500's.

The thing troubling me is why does the Gen run fine when the MH engine is running? With the rain we are having in north GA haven't been out to play with it.

Thom
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Old 10-13-2014, 09:39 AM   #19
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I have a Onan 6500W gas Gen, Gen will start, run for a minute then shut down. All advice greatly appreciated.
Thom
Thom
When mine did that it turned out to be a bad voltage regulator (which is located behind the stop/start switch panel on the generator).
A troubleshooting guide for your particular model Onan can be found here:
Troubleshooting and Cross-Reference Guides | Flight Systems, Inc
Good luck
Mel
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Old 10-13-2014, 09:56 AM   #20
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The thing troubling me is why does the Gen run fine when the MH engine is running? With the rain we are having in north GA haven't been out to play with it.

Thom

Some searching online turned up the following.....

Could explain why generator runs okay when MH engine running.....the MH alternator feeding
Power to batteries keeps the voltage the generator "sees" above its shutdown limit.

I think I also remember some have addressed this problem by running a larger gauge wire
to the generator from the batteries so that less voltage drop occurs due to resistance.


"1. which set of batteries are powering the generator? - the house batteries or the chassis batteries. Since *most* RV spec'd gensets do not have an internal 12vdc supply (charger) they rely on clean 12VDC from the RV batteries being recharged from the converter. If the Generator sees less than 12.2 volts at it's connection it will shut down.

2. Poor ground to the 12volt system. I have had a few with bad or loose grounds powering the 12v side of the generator where they ground to the frame. In 1 case I ran a new ground from the batteries straight to the unit."
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Old 10-13-2014, 09:58 AM   #21
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Thanks Mel, will check that out.

Thom
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Old 10-13-2014, 10:02 AM   #22
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Originally Posted by pasdad1 View Post
Some searching online turned up the following.....

Could explain why generator runs okay when MH engine running.....the MH alternator feeding
Power to batteries keeps the voltage the generator "sees" above its shutdown limit.

I think I also remember some have addressed this problem by running a larger gauge wire
to the generator from the batteries so that less voltage drop occurs due to resistance.


"1. which set of batteries are powering the generator? - the house batteries or the chassis batteries. Since *most* RV spec'd gensets do not have an internal 12vdc supply (charger) they rely on clean 12VDC from the RV batteries being recharged from the converter. If the Generator sees less than 12.2 volts at it's connection it will shut down.

2. Poor ground to the 12volt system. I have had a few with bad or loose grounds powering the 12v side of the generator where they ground to the frame. In 1 case I ran a new ground from the batteries straight to the unit."

Thanks for reply, that's great info in general. My gosh steep learning curve.

Thom
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