feepfeep Posted May 25, 2021 Report Share Posted May 25, 2021 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. Quote Link to comment Share on other sites More sharing options...
Ray,IN Posted May 25, 2021 Report Share Posted May 25, 2021 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/ Quote 2000 Winnebago Ultimate Freedom USQ40JD, ISC 8.3 Cummins 350, Spartan MM Chassis. USA IN 1SG retired;Good Sam Life member,FMCA ." And so, my fellow Americans: ask not what your country can do for you--ask what you can do for your country. John F. Kennedy 20 Jan 1961 Link to comment Share on other sites More sharing options...
feepfeep Posted May 25, 2021 Author Report Share Posted May 25, 2021 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. Quote Link to comment Share on other sites More sharing options...
feepfeep Posted May 25, 2021 Author Report Share Posted May 25, 2021 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. Quote Link to comment Share on other sites More sharing options...
Dutch_12078 Posted May 25, 2021 Report Share Posted May 25, 2021 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 Quote Dutch 2001 GBM Landau 34' Class A F-53 Chassis, Triton V10, TST TPMS 2011 Toyota RAV4 4WD/Remco pump ReadyBrute Elite tow bar/brake system Link to comment Share on other sites More sharing options...
feepfeep Posted May 25, 2021 Author Report Share Posted May 25, 2021 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. Quote Link to comment Share on other sites More sharing options...
Dutch_12078 Posted May 25, 2021 Report Share Posted May 25, 2021 It may have been air bound that prevented it from drawing gas. Disconnecting the fuel line likely bled the air out of the line. Quote Dutch 2001 GBM Landau 34' Class A F-53 Chassis, Triton V10, TST TPMS 2011 Toyota RAV4 4WD/Remco pump ReadyBrute Elite tow bar/brake system Link to comment Share on other sites More sharing options...
feepfeep Posted May 26, 2021 Author Report Share Posted May 26, 2021 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. Quote Link to comment Share on other sites More sharing options...
Kirk W Posted May 26, 2021 Report Share Posted May 26, 2021 9 hours ago, feepfeep said: Didn't grow up around engines but prefer doing my own work so I'm bumbling my way through all this. Sounds to me as though you are doing pretty good, thus far. Welcome to the Escapee forums! Quote Good travelin !...............KirkFull-time 11+ years...... Now seasonal travelers.Kirk & Pam's Great RV Adventure Link to comment Share on other sites More sharing options...
Wrknrvr Posted May 26, 2021 Report Share Posted May 26, 2021 While your are in the fuel supply department. Replacing the gas line from the tank to the generator could be a good idea. Vern in a T-shirt Quote Link to comment Share on other sites More sharing options...
oldjohnt Posted May 26, 2021 Report Share Posted May 26, 2021 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 Quote Link to comment Share on other sites More sharing options...
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