Good Sam Club Open Roads Forum: Class A Motorhomes: Generator vapor locking
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 > Generator vapor locking

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hohenwald48

Nashville, TN

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Posted: 07/22/20 11:02am Link  |  Quote  |  Print  |  Notify Moderator

dodge guy wrote:


You guys are aware this is the Generator engine right? The generator runs In completely different parameters than the vehicle engine.


Well, I know it's been said several times already and I know you don't want to think it's the problem but your description of the problem indicates that you have an oil pressure issue. Either from low oil level, high oil level, wrong oil or bad oil pressure sensor. I usually do the easy stuff first.

The generator needs to be level when checking and just because the motorhome is level doesn't mean the generator is level. Also, are you screwing the dipstick in to check it or just sticking it in and pulling it out? It makes a difference.

* This post was edited 07/22/20 11:21am by hohenwald48 *


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dodge guy

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Posted: 07/22/20 12:09pm Link  |  Quote  |  Print  |  Notify Moderator

I tried the oil level low, high and to the full mark when hot with the dipstick crewed all the way in. I’m running 20W50 weight oil. And yes the vehicle and generator are level. The only thing I haven’t done is replace the oil pressure switch.
I have done a lot more research on my issue and the consensus seems to be the fuel pump is getting weak when it gets hot, which makes sense. And for $45 I’ll replace the pump.


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4x4van

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Posted: 07/22/20 12:33pm Link  |  Quote  |  Print  |  Notify Moderator

If it was vapor lock, it would not start right back up; it would require a bit of cooling down time. JMHO.


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Posted: 07/22/20 12:35pm Link  |  Quote  |  Print  |  Notify Moderator

dodge guy wrote:

Bruce Brown wrote:

dodge guy wrote:

It very well could be a fuel pump. If it were weak Pump) and electric pumps are known to work at slower speeds when they get hot) would Cause the issue I’m having. I can’t see it being an oil issue only at hotter temps. I will try the pump first. If not then I’ll do an oil switch. If it were an oil switch issue it should give a code on why it shut down. I never get a code. There is no code to be set for low fuel flow. So if it died due to low fuel it wouldn’t set a code.

It's your money so do what you want.

If it were my money I'd start with the oil switch as Doug suggested. Pretty cheap and easy to try, and 100% makes sense as to what is happening, as he explained.

With that said, we once owned a Ford powered MH that would die when it got hot - it was the fuel pump. The big difference is that one wouldn't immediately re-start and run well. Sometimes it would re-start and limp, sometimes it wouldn't re-start until it had cooled.


You guys are aware this is the Generator engine right? The generator runs In completely different parameters than the vehicle engine.

I've very aware. My note on the MH was yes, a hot fuel pump may indeed be an issue. With that said, it made no difference if it was rough or smooth, when it died it died. It was 100% a temperature issue and 0% a terrain issue.

In your case the fact it only does it only when you hit a bump or shake it leads me to believe the switch is more likely to be the issue. Keep in mind heat effects electronics too.

But like I said, it's your money. If you want to start with a $45.00 pump first it might save you from buying a $4.00 switch later. Me - I'd rather start with the $4.00 switch in hopes I'd be saving $45.00 later, but thats just me.

I'm sure you'll get it figured out and let us know - and we'll all appreciate your information!


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dodge guy

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Posted: 07/22/20 04:45pm Link  |  Quote  |  Print  |  Notify Moderator

4x4van wrote:

If it was vapor lock, it would not start right back up; it would require a bit of cooling down time. JMHO.


I agree. And the more I have been thinking and researching, the extended crank time after it dies leads me to believe the carb is running empty. And the extended cranks fills the float bowl. I may end up trying an oil pressure switch. The fuel pump from Airtex (the company that supplies them to Onan) is on back order. And I don’t want to spend $150 for a fuel pump just because it says Onan. So I may try that first.

hohenwald48

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Posted: 07/22/20 05:48pm Link  |  Quote  |  Print  |  Notify Moderator

You can get the fuel pump on Amazon for around $30. Let us know what you ultimately find to be the problem and good luck.

* This post was edited 07/22/20 05:56pm by hohenwald48 *

dodge guy

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Posted: 07/22/20 06:18pm Link  |  Quote  |  Print  |  Notify Moderator

hohenwald48 wrote:

You can get the fuel pump on Amazon for around $30. Let us know what you ultimately find to be the problem and good luck.


Thanks. The cheap ones seem to be off brands. I wanted to go with the Airtex because they are the ones that supply Onan with the fuel pumps. However, if the oil pressure switch doesn't fix it I may just go with the he cheap pimp for now and see how it does. If it does fix it then I will get the better pump when it becomes available.

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Posted: 07/22/20 09:40pm Link  |  Quote  |  Print  |  Notify Moderator

You should be able to check the switch just by unplugging it.
Mr Gasket sells different psi fuel pumps and you can get them at most auto parts stores.
They even make a diesel fuel pump (green), I have one for the lift pump on my farm tractor.

GREGORYJ

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Posted: 07/22/20 10:30pm Link  |  Quote  |  Print  |  Notify Moderator

After the generator stops after running and is hot, press and hold the generator primer button, if you don't hear the normal pulsing sound of the electric fuel pump, it has likely seized. After it cools, try holding the primer button again, if you hear it, the generator will likely start and run again till the pump gets hot then seizes again. Replace the pump. The Amazon replacement pump worked well for me. With the generator running, the electric fuel pump should run continuously, but you just can't hear it over the generator's noise.


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hohenwald48

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Posted: 07/23/20 01:44pm Link  |  Quote  |  Print  |  Notify Moderator

dodge guy wrote:

hohenwald48 wrote:

You can get the fuel pump on Amazon for around $30. Let us know what you ultimately find to be the problem and good luck.


Thanks. The cheap ones seem to be off brands. I wanted to go with the Airtex because they are the ones that supply Onan with the fuel pumps. However, if the oil pressure switch doesn't fix it I may just go with the he cheap pimp for now and see how it does. If it does fix it then I will get the better pump when it becomes available.


Yeah, I know what you mean. The last cheap one I bought only lasted 7 years. Pure junk.

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