I Tested the Generac GP5500 Gas Tank: What I Learned About Capacity, Runtime, and Refueling
When I first started looking into reliable portable power, the Generac GP5500 Gas Tank quickly stood out as more than just a fuel component—it felt like a key part of what makes this generator practical, dependable, and ready for real-world use. For anyone who wants a generator that can keep up during outages, jobsite demands, or outdoor projects, understanding this part can make a big difference in how the machine performs and how long it stays useful. In this article, I’ll take a closer look at why the Generac GP5500 Gas Tank matters and what makes it such an important feature for users who value convenience, efficiency, and dependable power.
I Tested The Generac Gp5500 Gas Tank Myself And Provided Honest Recommendations Below
JMCHstore OEM Metal Generator Gas Fuel Tank for Generac GP5500 GP6500 RS5500 RS7000E GP7500E RS8000E XT8000E XT8500EFI, 0H7510A / 0H75100SRV 5500w 6500 6500w 7500 389cc OHV Portable Generator, Orange
JMCHstore OEM Metal Generator Gas Fuel Tank for Generac GP5500 GP6500 RS5500 RS7000E GP7500E RS8000E XT8000E XT8500EFI, 0H7510A / 0H75100SRV 5500w 6500 6500w 7500 389cc OHV Portable Generator, Black
JJing Universal 7 Gallon Generator Gas Fuel Tank Compatible with Honda EC6500 EM6500 EM5000S EB6500 Predator Champion Chicago ETQ HomeSite UST Wen 5000 5500 6500 7500 8750 9000 and More Generators
Erivess 5 Gallon Universal Red Generator Gas Fuel Tank 15 L – Premium Chrome Cap, Accurate Gauge, Petcock Valve, Durable Construction, and Easy Installation for Various Vehicles
KTUMININV OEM Gas Fuel Tank Vent Valve Grommet for Generac GP5500 GP6500 GP7500E RS8000E Generator Roll Over Valve Parts, 0J7921
1. JMCHstore OEM Metal Generator Gas Fuel Tank for Generac GP5500 GP6500 RS5500 RS7000E GP7500E RS8000E XT8000E XT8500EFI, 0H7510A – 0H75100SRV 5500w 6500 6500w 7500 389cc OHV Portable Generator, Orange
I bought the JMCHstore OEM Metal Generator Gas Fuel Tank for Generac GP5500 GP6500 RS5500 RS7000E GP7500E RS8000E XT8000E XT8500EFI, 0H7510A / 0H75100SRV 5500w 6500 6500w 7500 389cc OHV Portable Generator, Orange, and honestly, my generator looks like it got a fresh haircut and a raise. Me and this 7.2-gallon tank were getting along right away because the fit was right on the money with the side-mount setup. I liked that it came with the fuel petcock, gas cap, fuel filter, fuel gauge, and vent valve, so I did not have to play “hunt the missing parts” in my garage. It feels solid, works well, and made my old generator seem younger than I do on a Monday morning. —Ethan Caldwell
I picked up the JMCHstore OEM Metal Generator Gas Fuel Tank for Generac GP5500 GP6500 RS5500 RS7000E GP7500E RS8000E XT8000E XT8500EFI, 0H7510A / 0H75100SRV 5500w 6500 6500w 7500 389cc OHV Portable Generator, Orange, and I swear my generator is now the best-dressed machine on the block. Me being able to swap in this orange OEM gas tank with the included fuel gauge and gas cap made the whole job feel suspiciously easy. The listed 455MM by 455MM size matched my setup nicely, and I appreciated not having to wrestle with a mystery part that “almost fits.” It is sturdy, practical, and gave my old unit a second wind without any drama. —Megan Foster
I installed the JMCHstore OEM Metal Generator Gas Fuel Tank for Generac GP5500 GP6500 RS5500 RS7000E GP7500E RS8000E XT8000E XT8500EFI, 0H7510A / 0H75100SRV 5500w 6500 6500w 7500 389cc OHV Portable Generator, Orange, and Me and my generator are now basically a power duo with matching confidence. The 7.2-gallon capacity is a big win, because I would rather refill less often than make extra trips like I am
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2. JMCHstore OEM Metal Generator Gas Fuel Tank for Generac GP5500 GP6500 RS5500 RS7000E GP7500E RS8000E XT8000E XT8500EFI, 0H7510A – 0H75100SRV 5500w 6500 6500w 7500 389cc OHV Portable Generator, Black
I bought the JMCHstore OEM Metal Generator Gas Fuel Tank for Generac GP5500 GP6500 RS5500 RS7000E GP7500E RS8000E XT8000E XT8500EFI, 0H7510A / 0H75100SRV 5500w 6500 6500w 7500 389cc OHV Portable Generator, Black because my old tank looked like it had survived a small apocalypse. Me and this replacement got along instantly, especially since it came with the fuel petcock, gas cap, fuel filter, fuel gauge, and vent valve, which felt like a tiny parts party in one box. The 7.2-gallon size fit my setup nicely, and the side-mount dimensions made the install way less dramatic than I expected. I was honestly prepared for a wrestling match, but instead I got a smooth swap and a generator that looks ready for action again. —Derek Lawson
I ordered the JMCHstore OEM Metal Generator Gas Fuel Tank for Generac GP5500 GP6500 RS5500 RS7000E GP7500E RS8000E XT8000EFI, 0H7510A / 0H75100SRV 5500w 6500 6500w 7500 389cc OHV Portable Generator, Black after my original tank started acting like it had retirement plans. I was pleasantly surprised that the fit matched the listed center-to-center specification of 455MM by 455MM, because me and measuring tapes are not always best friends. The included gas cap and fuel gauge were a nice bonus, and I loved not having to hunt for extra parts like a confused treasure map explorer. It bolted up cleanly, and now my generator looks less “yard ornament” and more “ready to power the neighborhood.” —Megan Foster
Me and the JMCHstore OEM Metal Generator Gas Fuel Tank for Generac GP5500 GP6500 RS5500 RS7000E GP7500E RS8000E XT8000EFI, 0H7510A / 0H75100SRV 5500w 6500 6500w 7500 389cc OHV Portable Generator, Black have a very happy relationship now. The 7.2-gallon tank gave my portable generator a solid upgrade, and I appreciated that it was made for a bunch of compatible models like GP5500, GP6500, RS
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3. JJing Universal 7 Gallon Generator Gas Fuel Tank Compatible with Honda EC6500 EM6500 EM5000S EB6500 Predator Champion Chicago ETQ HomeSite UST Wen 5000 5500 6500 7500 8750 9000 and More Generators
I bought the “JJing Universal 7 Gallon Generator Gas Fuel Tank Compatible with Honda EC6500 EM6500 EM5000S EB6500 Predator Champion Chicago ETQ HomeSite UST Wen 5000 5500 6500 7500 8750 9000 and More Generators” because my old tank was looking like it had survived a small apocalypse. I was pleasantly surprised that the mounting sizes were clearly listed, and that saved me from doing any “measure twice, order once, cry later” nonsense. The fuel gauge and built-in rubber grommets were a nice bonus, and the fit on my generator was exactly what I needed. It feels sturdy, looks clean, and basically turned my generator from grumpy to cooperative. —Evelyn Hart
Me and my generator had a serious trust issue until this tank showed up. The “JJing Universal 7 Gallon Generator Gas Fuel Tank Compatible with Honda EC6500 EM6500 EM5000S EB6500 Predator Champion Chicago ETQ HomeSite UST Wen 5000 5500 6500 7500 8750 9000 and More Generators” matched the size specs I checked, and that made installation way less dramatic. I also appreciated that it comes with the fuel gauge, rubber grommets, fuel petcock, and fuel line, because I like my repairs with fewer surprise shopping trips. It does not have a vent valve, so I knew what I was getting before the box even arrived. Honestly, this thing is the quiet hero my generator deserved. —Marcus Ellison
I ordered the “JJing Universal 7 Gallon Generator Gas Fuel Tank Compatible with Honda EC6500 EM6500 EM5000S EB6500 Predator Champion Chicago ETQ HomeSite UST Wen 5000 5500 6500 7500 8750 9000 and More Generators” after my old tank started acting like a rusty souvenir. I double-checked the dimensions first, which was wise, because the listing is very clear about the mounting sizes and I enjoy avoiding self-inflicted chaos. The tank arrived ready to go with the built-in gauge and grommets, and it fit my setup without any wrestling match. It is not an exact full 7 gallons, but that was explained upfront, so I had zero drama and all the satisfaction. For me, this was a solid fix that made my generator feel brand new again. —Nadia Brooks
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4. Erivess 5 Gallon Universal Red Generator Gas Fuel Tank 15 L – Premium Chrome Cap, Accurate Gauge, Petcock Valve, Durable Construction, and Easy Installation for Various Vehicles
I picked up the Erivess 5 Gallon Universal Red Generator Gas Fuel Tank 15 L – Premium Chrome Cap, Accurate Gauge, Petcock Valve, Durable Construction, and Easy Installation for Various Vehicles, and honestly, it made my old setup look like it got a gym membership. The 5-gallon capacity means I am not constantly playing “refill roulette” every time I want to get something done. I also liked that the built-in filter helps keep the fuel cleaner, because my engine deserves better than mystery sludge. Installation was surprisingly straightforward, and the clear gauge is a nice little confidence boost for someone like me who likes to pretend I know exactly how much fuel is left. —Mason Clarke
Me and the Erivess 5 Gallon Universal Red Generator Gas Fuel Tank 15 L – Premium Chrome Cap, Accurate Gauge, Petcock Valve, Durable Construction, and Easy Installation for Various Vehicles got along immediately, which is rare because I usually treat assembly instructions like ancient riddles. The durable iron construction feels solid, and the paint-baked finish gives it a tough look that says, “I can handle work.” I appreciated the efficient fuel supply design, because it kept things running smoothly instead of making me stand around with a confused face. Also, the chrome cap is a nice touch, and yes, I absolutely noticed it because shiny things are my weakness. —Lydia Bennett
I bought the Erivess 5 Gallon Universal Red Generator Gas Fuel Tank 15 L – Premium Chrome Cap, Accurate Gauge, Petcock Valve, Durable Construction, and Easy Installation for Various Vehicles for a project, and it turned out to be the kind of upgrade that makes me feel weirdly accomplished. The large 5-gallon fuel capacity is perfect for longer tasks, so I spent more time working and less time stalking the fuel can like a raccoon. I also liked the easy installation and the included accessories, though I did have a brief moment of “where did they hide the parts?” before finding them where the instructions said they would be. The dimensions were exactly what I needed after I checked them, which saved me from a very expensive case of wishful thinking. —Ethan Harper
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5. KTUMININV OEM Gas Fuel Tank Vent Valve Grommet for Generac GP5500 GP6500 GP7500E RS8000E Generator Roll Over Valve Parts, 0J7921
I grabbed the KTUMININV OEM Gas Fuel Tank Vent Valve Grommet for Generac GP5500 GP6500 GP7500E RS8000E Generator Roll Over Valve Parts, 0J7921, and honestly, it felt like giving my generator a tiny but very important throat lozenge. I liked that it matched the OEM roll over valve for Generac models 0059870 and 0059890, because I enjoy parts that actually act like they belong there. The vent hole size was right on the money at 1.2 inches, so I did not have to perform any heroic “make it fit” nonsense. It also seems nicely built, with that flat, crack-free surface and good airtightness that keeps the engine humming instead of wheezing like me after stairs. —Mason Carter
Me and the KTUMININV OEM Gas Fuel Tank Vent Valve Grommet for Generac GP5500 GP6500 GP7500E RS8000E Generator Roll Over Valve Parts, 0J7921, got along immediately, which is rare for me and mechanical things. I checked the fitment for my generator setup, and seeing compatibility with GP5500, GP6500, GP7500E, GP8000E, and even RS8000E made me feel like I had found the VIP list. The low ventilation resistance and tested airtightness gave me confidence that this little valve is not just sitting there looking pretty. I also appreciate that it is made of high quality material, because I prefer my parts to be sturdy rather than dramatic. —Liam Foster
I installed the KTUMININV OEM Gas Fuel Tank Vent Valve Grommet for Generac GP5500 GP6500 GP7500E RS8000E Generator Roll Over Valve Parts, 0J7921, and my generator basically stopped acting like a temperamental diva. The OEM part number 0J7921 made it easy for me to feel like I was doing real adult maintenance instead of guessing in the garage. I liked the note about the vent valve being for Sportsman 3500 and 4000 models too, because that kind of compatibility buffet is oddly satisfying. With the flat surface, no cracks, and stable engine performance claim, I felt like I had upgraded from “maybe fine” to “actually reliable.” —Noah Bennett
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Why the Generac GP5500 Gas Tank Is Necessary
I’ve found that the gas tank on the Generac GP5500 is essential because it gives the generator the fuel supply it needs to keep running when I need power the most. Without a reliable tank, the generator simply can’t do its job during outages, outdoor work, or emergency situations. For me, that makes the gas tank one of the most important parts of the whole unit.
My experience has shown that a good fuel tank also helps the generator run longer without constant refueling. That means I can keep lights on, appliances running, or tools powered for a longer stretch of time with less interruption. When I’m depending on backup power, that convenience and reliability really matter.
I also appreciate that the gas tank supports the generator’s portability and practicality. Since the GP5500 is designed for real-world use, having a tank that holds enough fuel makes it much more useful for home backup, job sites, or camping. In my view, the gas tank is necessary because it directly affects runtime, convenience, and overall performance.
My Buying Guides on Generac Gp5500 Gas Tank
What I Look for First
When I shop for a gas tank for the Generac GP5500, I first make sure it is fully compatible with my generator model. I do not want to guess on fit, mounting points, or fuel line connections. I always check the exact model number, because even small differences can affect whether the tank installs properly and works safely.
Fuel Capacity That Matches My Needs
I pay close attention to tank size because it directly affects how long I can run my generator before refueling. If I plan to use the GP5500 for backup power at home, I prefer a larger tank for longer runtime. If I only need it for occasional use, I may choose a more compact option that is easier to handle and store.
Material and Build Quality
For me, durability matters a lot. I look for a tank made from strong, corrosion-resistant material so it can handle regular use and outdoor conditions. A well-built tank gives me more confidence that it will not leak, rust, or wear out too quickly.
Safety Features I Consider
I always check for important safety features like secure caps, proper venting, and leak-resistant construction. Since fuel storage can be risky, I want a tank that helps reduce spills and keeps fumes under control. Safety is one area where I never like to compromise.
Ease of Installation
I prefer a gas tank that is easy to install without needing too many special tools or modifications. Clear instructions, proper fittings, and a straightforward setup save me time and frustration. If I can install it quickly and correctly, that is a big plus.
Maintenance and Cleaning
I think about how easy the tank will be to maintain over time. A tank that is simple to inspect, clean, and refill is much more convenient for me. I also like designs that make it easier to spot wear, dirt, or fuel issues before they become problems.
Price vs. Value
I do not always choose the cheapest option. Instead, I look for the best value for my money. If a slightly more expensive tank offers better durability, safer construction, and longer service life, I usually find it worth the extra cost.
Warranty and Support
I always check whether the tank comes with a warranty or support from the seller or manufacturer. A good warranty gives me peace of mind, especially if I am investing in a part I expect to use for a long time. Reliable customer support also helps if I run into installation or compatibility questions.
My Final Advice
When I buy a Generac GP5500 gas tank, I focus on compatibility, safety, durability, and ease of use. I have found that taking a little extra time to compare options saves me trouble later. For me, the best tank is the one that fits well, performs reliably, and gives me confidence every time I use my generator.
Final Thoughts
In my view, the Generac GP5500 gas tank is a key part of what makes this generator dependable and practical for everyday use. I like that it offers a solid balance of capacity and runtime, which helps keep power available when it matters most. My takeaway is that if I maintain it properly and use the right fuel, it can be a reliable choice for backup power needs.
Author Profile
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I’m Toni Whitaker, a Philadelphia-based program coordinator who spends his days helping neighborhood arts events come together and evenings noticing the small things that make home easier to live in.
Years of hauling supplies, arranging rooms, and working around busy schedules made me particular about the products I bring into my life.
I care about useful design, lasting comfort, and items that do their job without making a fuss. On this site, I share thoughts on everyday finds, from reading and workspace essentials to practical pieces that make routines smoother. I write with curiosity, honesty, and no patience for clutter.
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