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rforehand's avatar
rforehand
Explorer
Mar 28, 2015

How to test a fuel pump on an Onan 4000 generator

Could someone please just valid for me that I have taken the proper steps to test my Fuel pump, and offer your opinion on my findings? I have a 2014 Coachmen Leprechaun with Onan 4000 Genset. Gen ...
Class C
CloudDriver's avatar
CloudDriver
Explorer
Mar 28, 2015
The fuel pump on our Onan 4000 makes a buzzing sound when it runs. From the three steps you performed, it sure sounds like the pump is toast.

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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