Author Topic: onan 7.5 quiet diesel wont stsrt  (Read 4789 times)

David Lynch

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onan 7.5 quiet diesel wont stsrt
« on: May 26, 2013, 04:21:25 PM »
My onan 7.5 ran yesterday for ~30 minutes just fine.  Started her up this morning had a hard time starting and then ran real rough.  now it won't start at all.  seems to be starving for diesel but don't know.  any suggestions on what to check???  

Keith Oliver

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Re: onan 7.5 quiet diesel wont stsrt
« Reply #1 on: May 26, 2013, 04:22:23 PM »
fuel filter ready for a change?

David Lynch

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Re: onan 7.5 quiet diesel wont stsrt
« Reply #2 on: May 26, 2013, 04:38:06 PM »
Maybe   Have not serviced it yet.  Last full service 4/26/12.

Steve Huber Co-Admin

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Re: onan 7.5 quiet diesel wont stsrt
« Reply #3 on: May 26, 2013, 04:54:44 PM »
Keith's suggestion of fuel filter is probably correct. Do you have at least a 1/4 tank of fuel in main tank?
Steve
Steve
Coachless
2015- 6/24  07 Contessa Bayshore C9,  400 hp
2013-2015: 00 Marquis Tourmaline, C12, 425 hp
2005-2013: 01 Contessa Naples, 3126B, 330 hp

Edward Buker

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Re: onan 7.5 quiet diesel wont stsrt
« Reply #4 on: May 26, 2013, 10:38:04 PM »
Air cleaner check for nests or some form of blockage, that will give you the same symptom. Possibly fuel pump is not working.

Later Ed

David Lynch

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Re: onan 7.5 quiet diesel wont stsrt
« Reply #5 on: May 28, 2013, 02:11:02 AM »
Will do a fuel filter tomorrow

Roland DuBree

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Re: onan 7.5 quiet diesel wont stsrt
« Reply #6 on: August 21, 2013, 10:05:27 PM »
Mine will not start either.  My problem is low 12 VDC power supply to generator - like 8 volts instead of 12.  Been told need 12 volts. Suspect bad terminal connections but cannot find all terminal point locations to check for bad points. Check your supply voltage. Suspect generator needs a steady 12 VDC supply to keep it running and if to low it just shuts down.

David Lynch

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Re: onan 7.5 quiet diesel wont stsrt
« Reply #7 on: August 22, 2013, 04:38:59 PM »
Had the set serviced and the electrinc fuel pump was bad.  $300.00 later runs fune.