Community Forums

hayward3411 · 07-07-2017, 07:13 PM

How about your low oil sending unit?

bulldogs101 · 07-07-2017, 11:48 PM

thank you all, nothing seems to correct it so far, gonna roll with it as i have no choice. thanks for your help all

wingnut60 · 07-08-2017, 08:11 AM

If it is shutting off when moving, I feel it might be the low oil sensor--oil level is moving up/down with coach motion exposing the sensor. Or, the same motion is keeping the fuel pump from picking up fuel?

OLYLEN · 07-08-2017, 09:43 AM

If the Gen is mounted just behind cab it's most likely overheating from main motor heat. Some have added a fresh air deflector to dirrect that air to the cooling intake for the Gen.

LEN

bulldogs101 · 07-09-2017, 12:53 PM

anyone know where the low oil sending switch,plug is located in a 4000 onan mucroquiet unit made in 2001. I don't see it

In Pursuit · 07-09-2017, 01:37 PM

Sounds like weak fuel pump can't push fuel into a hot carberator. Also, be careful not to overkill oil as high level oil Will shutdown the genny. I know, both have happened to me. Last year weak fuel pump ($25) and this year too much oil. Had to pump out about a pint. Finicky things aren't they.

wingnut60 · 07-09-2017, 03:57 PM

If you don't have it, here is the Manual for the 4000:

http://www.joshwakefield.com/xplorer...quiet-4000.pdf

If you are sure the oil fill level is correct, then the low oil sensor shouldn't come into play unless defective.

Possibly the overheating mentioned previously?

bulldogs101 · 07-18-2017, 03:51 PM

there is no low oil sensor on this model, I gave dropped oil down to low mark, still doing the same.

**pasdad1** · 07-18-2017, 05:08 PM

Quote:

Originally Posted by bulldogs101

there is no low oil sensor on this model, I gave dropped oil down to low mark, still doing the same.

according to the PDF manual I found online it apparently does have some low oil sensor....otherwise "low oil" couldn't be cited as a cause of no start or it shutting down.

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bulldogs101 · 07-18-2017, 05:16 PM

no have the J series, only one without it

hohenwald48 · 07-18-2017, 05:57 PM

Since you have a 2001 motorhome I'd disregard all the suggestions about air flow, main motor heat and heat baffles unless you have moved or changed anything recently. If it's been running for the last 16 years it's unlikely that it has now decided there is insufficient airflow.

I have heard of problems with the fuel pumps causing the symptoms you describe. I'd probably just install a new one regardless not a lot of money and there seems to be no absolute way to test them. Here's one discussion http://www.irv2.com/forums/f87/onan-...nt-298659.html

Next I'd look at the fuel filter. I know you said you replaced it but I've read of some installations where there are 2 fuel filters. I'd look hard for a second filter. I'd also do a real good visual inspection of all connectors and connections just to make sure something isn't shaking around and bringing it to a halt since you say it's more susceptible when driving.

Also, I assume you are testing it with the generator side covers on. Folks think removing them will help with cooling but actually it interrupts the airflow pattern designed into the generator and it's housing causing them to overheat.

With the clues you've given so far, my money is on the fuel pump. good luck.

Darwin · 07-18-2017, 06:08 PM

Have you checked the coil.

Dtwallace · 07-18-2017, 06:45 PM

Quote:

Originally Posted by hohenwald48

Since you have a 2001 motorhome I'd disregard all the suggestions about air flow, main motor heat and heat baffles unless you have moved or changed anything recently. If it's been running for the last 16 years it's unlikely that it has now decided there is insufficient airflow.

I have heard of problems with the fuel pumps causing the symptoms you describe. I'd probably just install a new one regardless not a lot of money and there seems to be no absolute way to test them. Here's one discussion http://www.irv2.com/forums/f87/onan-...nt-298659.html

Next I'd look at the fuel filter. I know you said you replaced it but I've read of some installations where there are 2 fuel filters. I'd look hard for a second filter. I'd also do a real good visual inspection of all connectors and connections just to make sure something isn't shaking around and bringing it to a halt since you say it's more susceptible when driving.

Also, I assume you are testing it with the generator side covers on. Folks think removing them will help with cooling but actually it interrupts the airflow pattern designed into the generator and it's housing causing them to overheat.

With the clues you've given so far, my money is on the fuel pump. good luck.

I would pay close attention to the info hohenwald48 is giving you. And add one thing, check your carburetor linkage for free movement.

If it is sticking in any position at any time, it will cause an over speed or under speed condition that will cause your generator to shut down as a safety precaution.

This has been one thing that has caused me issues with these gasoline powered gensets 90% of the time, and can be resolved by using the spray carb cleaner, on the outside, and inside.

The other times it has always been the fuel starvation issue mentioned by hohenwald48.