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On Marquis 5000 (1996 with no fuel pump) won't suction fuel


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Struggling to get my 96 Marquis 5000 running. I know the model I own does not have a fuel pump. I disconnected the fuel line from the fuel filter and it is bone dry, not sucking gas. I have a full tank but I can't seem to get the line to suck gas to start the thing.

Last year I took it to Cummins and they said they used a constant flow of propane to get it to start which in turn started it sucking fuel. It ran once after that then stopped again. Apparently I ran it down too close to where the generator gas line is on the tank and it ran dry again. Great use of $200.

Called them today and they will not offer any assistance and want it brought back in to take more of my money for nothing.

So that said, anyone here have any experience with this? I'm desperate at this point. All I want to do is figure out how to get it to start/suck fuel in again so I can at least repeat whatever it was they did to get it running.

 I have zero mechanical experience and can't find any help for this one on Youtube either.

 

 

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I know of no gas engine that will "suck" fuel from a lower point without a fuel pump of some kind.

Page 7-12 of the Onan Marquis 5000 service manual states it does have a fuel pump. reference: https://1999southwind.com/DOWNLOAD/5500_Onan_Service.pdf

source: https://www.1999southwind.com/download/

Without a crystal ball I did not know your genset model number. You may download the correct service manual from: https://www.servicemanualbit.com/onan/

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6 minutes ago, Ray,IN said:

I know of no gas engine that will "suck" fuel from a lower point without a fuel pump of some kind.

Page 7-12 of the Onan Marquis 5000 service manual states it does have a fuel pump. reference: https://1999southwind.com/DOWNLOAD/5500_Onan_Service.pdf

source: https://www.1999southwind.com/download/

Without a crystal ball I did not know your genset model number. You may download the correct service manual from: https://www.servicemanualbit.com/onan/

This is definitely a big help just to find the manual. I've spent the past 3 hours online struggling with this and every search for manuals has left me with about 1000 popups from scam sites.

 

Thank you!

 

My model is Marquis 5000 5bgmfa26105f for reference.

 

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11 minutes ago, Ray,IN said:

I know of no gas engine that will "suck" fuel from a lower point without a fuel pump of some kind.

Page 7-12 of the Onan Marquis 5000 service manual states it does have a fuel pump. reference: https://1999southwind.com/DOWNLOAD/5500_Onan_Service.pdf

source: https://www.1999southwind.com/download/

Without a crystal ball I did not know your genset model number. You may download the correct service manual from: https://www.servicemanualbit.com/onan/

unfortunately nothing at the service manual location for my model, or even the 5k at all. Working with 25 year old stuff is difficult.

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Just now, Dutch_12078 said:

Your Marquis 5000 BGM uses an Onan 149-2267 fuel pump. The pump is made by Carter, and sells as their P4070 inline pump for about a quarter of the Onan price.

https://www.amazon.com/gp/product/B000CIQ5DG/

https://www.rvupgradestore.com/Onan-149-2267-Gas-or-Diesel-Generator-Fuel-Pump-p/90-7852.htm

 

28 minutes ago, Ray,IN said:

I know of no gas engine that will "suck" fuel from a lower point without a fuel pump of some kind.

Page 7-12 of the Onan Marquis 5000 service manual states it does have a fuel pump. reference: https://1999southwind.com/DOWNLOAD/5500_Onan_Service.pdf

source: https://www.1999southwind.com/download/

Without a crystal ball I did not know your genset model number. You may download the correct service manual from: https://www.servicemanualbit.com/onan/

 

Thanks to both of you for the response. I had the sudden inspiration (duh) to check and see if the old owner had the manual in the giant ream of papers and he did. Found the fuel pump and while I had the line disconnected it finally started getting fuel. No idea what the issue was but it's running. Definitely going to replace the fuel pump.

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2 hours ago, Dutch_12078 said:

It may have been air bound that prevented it from drawing gas. Disconnecting the fuel line likely bled the air out of the line.

That's exactly what it was. I crawled under there to look at the pump and to see where the line was and was wiggling it around. Hit the starter and immediately smelled gas.

Thanks again. Didn't grow up around engines but prefer doing my own work so I'm bumbling my way through all this.

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Good catch, yep a leak in the suction INLET side of a fuel pump allowing the entrance of air can stop them while a leak in the pressure OUTPUT side can cause gas to leak. If rubber lines are old or cracked or checked or leaking of course they need replaced ..........

 John T

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