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Old 03-20-2012, 06:21 PM   #1
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Onan Diesel 7500 won't start

Tried starting my generator today. started and ran for about five seconds and shut off. Now it will not start. I get one flash on the lighted switch and then nothing. The one flash for the code means overheating but the generator didn't run long enough to do that. All fluids are fine, you can prime the pump ( full tank) so I know the fuel pump works.
Any ideas?
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Old 03-20-2012, 06:31 PM   #2
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My first guess would be that you are out of gas. The pickup for the generator is usually a bit higher in the tank so you will not run out of fuel for your engine. I think most motorhomes this is close to the 1/4 tank indication. Hopefully it is that simple.
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Old 03-20-2012, 07:34 PM   #3
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I did that once too. Didn't even occur to me at the time that the fuel was low. Just a few seconds running and it was dead. After refueling, I think they tell you to hold the stop button down for like 2 minutes to reprime?
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Old 03-20-2012, 07:50 PM   #4
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We all seem to assume it is a Quiet Diesel - Is that so?

If so, make sure that you not only have coolant in the resevoir, but that it is completely full at the filler that has the pressure cap on it. It's below an access cover on the slanted area of the top, near the circuit breaker. There are sensors on the filler pipe just below the cap, and I believe that they are for fluid level.
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Old 03-20-2012, 08:10 PM   #5
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Thanks for the replies. Fuel tank is full and its never been less then 3/4 full since I was running the generator last week. It is a Onan Quiet Diesel. The motor will not crank. You simply get one flash on the starter switch light and then that's it. You can prime the fuel pump. I checked the coolant thru the viewing area and it seemed fine, but I guess it wouldn't hurt to add some more. I'll give that a try in the morning. I do have a mechanic coming in the afternoon to take a look as he too was puzzled as to what the problem could be.
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Old 03-20-2012, 09:04 PM   #6
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Couldn't wait for the morning so I pulled the filler neck out and checked coolant all was fine. Also checked the fuses that are connected and they seemed fine too.
Still no start.
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Old 03-20-2012, 09:14 PM   #7
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Have you tried starting from the generator itself........not a remote switch? What were the results?
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Old 03-20-2012, 10:14 PM   #8
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If you haven't changed the coolant for a long time it will corrode the overheat sensor. This will let you start the gen set but it will shut down pretty quickly and give the overheat code. Learned through personal experience!! Cost to drop the generator to replace was high!
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Old 03-21-2012, 05:19 AM   #9
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Trying to start at the switch on the generator not the remote. It's been about two years since I changed the coolant. There was no corrosion when I took the pressure cap off that I could see.
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Old 03-21-2012, 05:28 AM   #10
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Mine started and died right out of the blue. It then had long crank times and would fire up for a few seconds and die.
I changed the fuel filter and haven't had a problem since. It's actually quieter than it was before which leads me to believe that it was starving a little for fuel before it finally acted up.
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Old 03-21-2012, 06:03 AM   #11
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In post number 5, he states that the engine will not crank over.

Obviously your starter is not getting power to crank the engine. I would check both of your large power supply cables connected to the bottom rear of the genset, especially the ground. Make sure they are clean and secure.

Because you are using the starter switch directly on the genset, this next step will not help but is a good thing to do while you are in there. I would check the cable harness connector making sure that there is no corrosion inside. While it's open spray some contact cleaner in there and plug it together a few times, then squeeze some electrolyte grease onto the contacts.

Good preventative maintenance.

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Old 03-21-2012, 06:49 AM   #12
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Quote:
Originally Posted by Dr4Film View Post
In post number 5, he states that the engine will not crank over.

Obviously your starter is not getting power to crank the engine. I would check both of your large power supply cables connected to the bottom rear of the genset, especially the ground. Make sure they are clean and secure.

Because you are using the starter switch directly on the genset, this next step will not help but is a good thing to do while you are in there. I would check the cable harness connector making sure that there is no corrosion inside. While it's open spray some contact cleaner in there and plug it together a few times, then squeeze some electrolyte grease onto the contacts.

Good preventative maintenance.

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Good suggestions. My MH is my work truck so to speak as I'm a vendor at motorcycle rallies. Today is set up for another rally in Florida so I will not have time to do much of anything to it. I'm hoping that the mechanic coming can get this up and running as it was a tough night without AC on and it's only suppose to get hotter the next couple of days. At least I have a Honda 2000 to keep the batteries charged and fans running.
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Old 03-21-2012, 07:56 AM   #13
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Some manufactures install an inline fuel filter in addition to the Onan filter. Sure had me going for about a week.
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Old 03-21-2012, 03:14 PM   #14
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Some manufactures install an inline fuel filter in addition to the Onan filter. Sure had me going for about a week.
Can't find another filter and I doubt that would keep it from cranking.
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