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Old 12-09-2012, 02:09 PM   #1
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Generator won't start

I have a 7.5 Onan, fairly new batteries, and good fuel. I press the glow plug side of rocker switch for 30 seconds, generator will not start. I had the generator running one week ago, and it ran just fine. Also, the reset button on the generator panel is not tripped. Does anyone have any ideas? Thanks.
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Old 12-09-2012, 02:30 PM   #2
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When you say "it will not start", does it crank but not start or will it not crank? When you hold down the bottom of the rocker switch you are running the fuel pump. There is a delay on the upper side of the rocker switch which allows for the glow plugs to heat the combustion chamber. In colder weather this delay is longer. Maybe you just need to hold down the start switch longer.
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Old 12-09-2012, 03:01 PM   #3
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Thanks for the come back. Yes, the engine turns over fast and strong. I have been trying to start it 3-4 different times, holding the rocker switch down for around 30 seconds. The engine turns over, but will not start.
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Old 12-09-2012, 03:09 PM   #4
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Any codes? Is the red lamp on the gen set itself flashing?
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Old 12-09-2012, 03:22 PM   #5
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Since you said glow plug it must be diesel.

Check the fuel supply, could be loose wire on selenoid valve or cracked line.

If ran a week ago then prime should be good.

To confirm fuel shoot SMALL amount of starting fluid into air cleaner while cranking, if sputters then fuel problem

Check for fuel at inlet, are you more than 1/4 full?
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Old 12-09-2012, 03:27 PM   #6
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Quote:
Originally Posted by TQ60 View Post
Since you said glow plug it must be diesel.

Check the fuel supply, could be loose wire on selenoid valve or cracked line.

If ran a week ago then prime should be good.

To confirm fuel shoot SMALL amount of starting fluid into air cleaner while cranking, if sputters then fuel problem

Check for fuel at inlet, are you more than 1/4 full?
Careful with the starting fluid. A little goes a long way. don't want you to blow the top off of 1 of the cylinders. sounds like fule supply to me.
take care..
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Old 12-09-2012, 04:13 PM   #7
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Reset button does not effect starting.

As mentioned, check your fuel level. If you are parked unlevel you may need over 1/2 of a tank for it to run. Did you get an owners manual? If not, get one and you will be much happier. My 8kw does not start exactly like yours for example. I just hold the start button until it turns over. That can take 30 seconds before it even turns over if it is cold. During that time the light blinks.

IF the weather is now colder than a few weeks ago you could have a glow plug fuse popped. The is a current thread on a very similiar issue. On the generator there is a small panel that is slanted. It has a screw holding it shut. Open it and you will find a radiator cap. If you dig around you should be able to pull out 3 fused leads. Check those.
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Old 12-09-2012, 04:18 PM   #8
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Does the exhaust have any colorto it when cranking? If so what color?
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Old 12-09-2012, 04:26 PM   #9
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It does sound like a fuel problem. When you hold the ottom of the button down can you hear the fuel pump run? If so, hold the button down & let it run for some time. You might hear it change tone as it pressurizes the fuel.
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Old 12-09-2012, 08:05 PM   #10
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Try holding the starter switch in the "off" position for 15-20 seconds. That primes the pump if it has lost it's prime.

When it is cold outside you sometimes must hold the starter in the "on" position for quite a while to heat things up.
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Old 12-10-2012, 06:13 PM   #11
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Here is some useful information on starting. It includes the 7.5KW model. Check page two to see if yours is listed.
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Old 12-11-2012, 11:26 AM   #12
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Check the fuel shut down solenoid. If it does not move when the start sequence is initiated, no fuel. You should be able to visually observe by using the start button on the genset itself.
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Old 12-11-2012, 12:34 PM   #13
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Some cautions with using starting fluid. DO NOT use the glow plugs when using starting fluid!
Also, make sure the engine is cranking over while you spray the starting fluid, otherwise you can cause damage. I've heard of starter motors breaking off of motors.
One safe and easy way to use starting fluid is to spray a nice portion on to a rag and lay it over the intake, it eliminates the harsh startups usually associated with using starting fluid.
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