Onan 4000 generator fuel pump replacement and diagnosis.
Onan 4000 rv generator fuel pump.
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Joebruns typically for an onan 5500 generator they mounted the fuel filter fuel pump combination on the underside of the motorhome directly below the generator.
The new fuel filter will just fit inside the oval hole allowing it to be connected to the fuel pump.
I put a small amount of permatex high temperature thread sealant at the base of the threads on the new fuel filter.
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So i decided to do the fuel pump test just after the generator dies.
I started up the generator and waited for it to die.
When to test the fuel pump.
The fuel pump on our onan 4000 makes a buzzing sound when it runs.
You should check your rv s manual for the exact part numbers needed for your specific onan generator.
The fuel line connects diretly into th fuel filter which can be screwed off of the fuel pump similar to how i show in this article.
Onan qg 4000 for rv frequency hz 60.
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Probably an obvious statement but since there is only one wire 12v positive on the pump the metal frame of the pump must be connected to the negative terminal on the battery for the pump to run.
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Onan fuel pump airtex e11007 onan fuel filter onan air filter 24 inches of fuel line 1 4 inch inside diameter id teflon plumbers tape fuel hose clamps testing the fuel line some lazy daze rvs have had a fuel line issue.
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From the three steps you performed it sure sounds like the pump is toast.
That was my plan.
These seem to be from the late 1990s to the early 2000s.
I suspected that the fuel pump would function just fine if tested when the generator is cooled down.
With this in mind it is a good idea to conduct a simple test.