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PhrogPhlyer's avatar
PhrogPhlyer
Explorer
Oct 09, 2016

Onan Marquis 7000 Fuel Pump

My fuel pump on the Marquis 7000 has gone bad. Unfortunately, the diagram I have of the generator doesn't show the location of the pump, and you can't see it from the front of the generator. It appears to be at the right rear of the generator (that seems to be where the fuel hose from the carb goes). Anyone know the easiest way to get at the pump to replace it. Can I get to it from underneath the RV, or do I have to remove the generator from the RV?
  • j-d's avatar
    j-d
    Explorer II
    Oct 10, 2016
    If you'll post the specific Model and Spec, we may be able to find you a service manual.
  • PhrogPhlyer's avatar
    PhrogPhlyer
    Explorer
    Oct 10, 2016
    Thanks for the info. I'll have to check and see if I can do that with my '96 Holiday Rambler.
  • Dutch_12078's avatar
    Dutch_12078
    Explorer II
    Oct 09, 2016
    On our previous coach with a Marquis 7000, I replaced the fuel pump by supporting the outer edge with a floor jack and removing all of the mounting bolts except one at the rear on each side that was only loosened. Lowering the jack allowed the genny to tilt down far enough to remove the top cover and access the fuel pump. It may be necessary to disconnect some of the wiring if there is not enough slack. If I recall correctly, the fuel line connections had to be reached through the bottom. I bought a Carter exact replacement pump on Amazon for about $60, much less than the Onan price as I recall, but that could vary depending on just which spec letter yours has on the model/serial plate.

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