Does The Onan Generator Quiet Series 4000 CM32ZR Include A Gas Tank?

Updated 05/18/2026 | Published 05/16/2026

Products Featured in This Question

Onan 4,500-Watt Portable Inverter Generator - Gas - Remote Start

$1130.11

Question:

Do I need to put gasoline in the generator separately?

asked by: Lavana

Expert Reply:

Hi Lavana!

The Onan Generator - Quiet Series 4000 EVAP Onboard RV Generator - 4,000 Watts - Gasoline # CM32ZR does need to have an external/auxiliary tank to tap into to operate (either just a tank like on a 5th wheel, or the gas tank on an RV). It does not have a tank built into it for use, unfortunately. If you check out the included picture, I circled the fuel inlet area.

If you are wanting something with an onboard tank, you would need something like the Onan 4,500-Watt Portable Inverter Generator - Gas - Remote Start # CM76MR. This has a 3.4-gallon fuel tank and will run the generator for 18 hours (at 25% load), but it is a portably style unit.

What are you wanting to install this on?

expert reply by: Lazer S