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06-13-2016, 07:04 PM
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#1
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Junior Member
Holiday Rambler Owners Club
Join Date: Sep 2014
Posts: 23
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ONAN Marquis 7.0 gas generator won't start.
Replaced Fuse F2 gennie still won't start. Any ideas?
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1997 HR Vacationer 34ft F53 460VG
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06-13-2016, 07:17 PM
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#2
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Senior Member
Join Date: Apr 2011
Location: Powell River, B.C.
Posts: 31,455
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Do you have more than a 1/3 tank of fuel in the tank .
Gen sets are set up so they can't run the tank dry and strand you in the boonies.
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99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.
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06-13-2016, 07:32 PM
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#3
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Senior Member
Tiffin Owners Club
Join Date: Sep 2012
Location: Maryland
Posts: 1,437
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Will it turn over and not start or is it not turning over.
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06-13-2016, 09:33 PM
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#4
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Senior Member
Join Date: Apr 2011
Location: Powell River, B.C.
Posts: 31,455
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Quote:
Originally Posted by dabrooks
Will it turn over and not start or is it not turning over.
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Boy am I dumb , that should have been my first question.
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99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.
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06-14-2016, 11:07 AM
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#5
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Junior Member
Holiday Rambler Owners Club
Join Date: Sep 2014
Posts: 23
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Have 1/2 tank of gas, gennie turns over fine. No fuel, can't hear fuel pump. Fuses are good. Think I will replace relay K4 next. After that, I have no idea!
Very fustrating!!
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1997 HR Vacationer 34ft F53 460VG
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06-14-2016, 11:27 AM
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#6
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Junior Member
Join Date: May 2011
Posts: 27
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Open the gen cover and use the start button on the gen. If you press down on the start button you should near the fuel pump. If the fuses are good and you don't hear the fuel pump then the fuel pump is probably bad. You can get a pump at NAPA and replace it yourself. Easy replacement.
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06-14-2016, 11:49 AM
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#7
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Senior Member
Monaco Owners Club
Join Date: Sep 2014
Posts: 4,569
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Follow the manual troubleshooting tree and you won't have to guess. It looks something like this.
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1996 Tioga Class C
2007 Monaco Diplomat 40 PDQ
TOAD 2012 Cadillac SRX 4
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06-14-2016, 07:39 PM
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#8
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Junior Member
Holiday Rambler Owners Club
Join Date: Sep 2014
Posts: 23
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Thanks for all the help everyone! Back to troubleshooting tomorrow!
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1997 HR Vacationer 34ft F53 460VG
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06-14-2016, 07:43 PM
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#9
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Senior Member
Join Date: Jan 2016
Posts: 540
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I don't see anywhere that you did the onboard diagnostic. If you do, I'll give 2-1 it reads a code 36. In fact, I think that's the only code these things throw!
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Lovey & Thurston - Cali Foothills
2001 HR Vacationer (SS Minnow) - Gasser!
Obviously A Lowly and Inferior MH
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06-14-2016, 07:53 PM
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#10
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Senior Member
Join Date: Nov 2015
Posts: 335
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Providing the fuel pump is the problem, save yourself a ton of headaches and get the proper Onan pump. There are a lot of fuel pumps that look the same and all have different operating pressures.
Depending on the vintage of your generator and the model, most newer Onan gen sets have a prime feature if you press and hold the stop button.
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2016 Fleetwood Bounder 36E
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06-15-2016, 11:51 AM
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#11
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Junior Member
Holiday Rambler Owners Club
Join Date: Sep 2014
Posts: 23
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Ok, haven't had time for more troubleshooting today. As far as on-board diagnostics, I don't think my generator supports that. There are no lights on the generator and the switch doesn't light up either.
When I depress the start/stop button, it turns over fine but no fuel pump noise. Think I will try a separate in-line pump and see if that works.
This 1997 ONAN generator doesn't appear to have a prime feature!
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1997 HR Vacationer 34ft F53 460VG
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06-15-2016, 12:38 PM
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#12
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Senior Member
Join Date: Nov 2015
Posts: 335
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Use a volt meter and see if the control is supplying 12 volts to the pump while your cranking it.
__________________
2016 Fleetwood Bounder 36E
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06-20-2016, 02:56 PM
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#13
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Junior Member
Holiday Rambler Owners Club
Join Date: Sep 2014
Posts: 23
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Replaced the K4 fuel pump relay, no difference. Checked for 12vdc at the pump while cranking. Got 12vdc, still no fuel. Found out there is a fuel pump solenoid E4, however can't get to it to check it out. Have a new fuel pump on order should be here Wednesday. Does anyone know if the fuel pump solenoid can be bypassed. Can't seem to find one.
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1997 HR Vacationer 34ft F53 460VG
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06-20-2016, 05:53 PM
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#14
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Senior Member
Join Date: Nov 2015
Posts: 335
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Just disconnect the wire to the pump and run a wire from B+ to the wire on the pump. It should pump fuel if the fuel pump is serviceable.
You should have narrowed that down when you checked for b+ at the pump while cranking. However I can think of two possibilities were 12 volts wold be present at the pump and a serviceabe pump would work.
1. The pump housing is not grounded, pretty sure your pump is a single wire pump.
2. You have a loose or dirty connection somewhere that allows 12 volts to appear present but drops to 0 once current flows through the pump. Not very likely since you measured 12 volts at the pump and I'm not aware of any internal thermal protection on Onan fuel pumps that might open and close causing you to read 12 volts bit it not be able to make the pump run.
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2016 Fleetwood Bounder 36E
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