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I've had this Bad Boy for about a month, and the Kawasaki died like it was out of fuel. I had put 6 gallons in each tank, so I couldn't have burned all that fuel. I checked the left tank. Empty. The right tank was completely full. Not going to take it back to the dealer until after the cutting season is over in another two months. The fuel line is hooked to the on-off valve but I haven't traced it to the tank. It's been too hot. Anybody ever experience this?

I think the crossover line going from tank to tank has a shutoff valve made into the line.

There is a shutoff valve that both fuel lines plug into. The valve has on and off. The next time I get on the mower, I'll put the selector in the middle and see if that works.

rainman14624 said:

There is a shutoff valve that both fuel lines plug into. The valve has on and off. The next time I get on the mower, I'll put the selector in the middle and see if that works.

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The tank crossover valve is either on the left position, for the left tank, or on the right position, for the right tank. There is no middle position that has fuel flow to both tanks.

rainman14624 said:

I've had this Bad Boy for about a month, and the Kawasaki died like it was out of fuel. I had put 6 gallons in each tank, so I couldn't have burned all that fuel. I checked the left tank. Empty. The right tank was completely full. Not going to take it back to the dealer until after the cutting season is over in another two months. The fuel line is hooked to the on-off valve but I haven't traced it to the tank. It's been too hot. Anybody ever experience this?

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Give us the model number and serial number of the mower. You may have a faulty valve or the wrong valve installed from the factory.
It's supposed to have a 3 Way valve.

Tiger Small Engine said:

The tank crossover valve is either on the left position, for the left tank, or on the right position, for the right tank. There is no middle position that has fuel flow to both tanks.

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MParr said:

Give us the model number and serial number of the mower. You may have a faulty valve or the wrong valve installed from the factory.
It's supposed to have a 3 Way valve.

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Something is goofy. The parts diagram shows a 3 way valve but the service manual shows a 2 way valve with the on-off lable for the valve on at least the 2025 model

MParr said:

Give us the model number and serial number of the mower. You may have a faulty valve or the wrong valve installed from the factory.
It's supposed to have a 3 Way valve.

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Bad Boy Maverick HD 48-inch cut with Kawasaki FX691V. Serial BMH48FX69105230006. Leftover '23 model that I got at a nice discount. Wrong valve makes sense to me.

Here's a photo of my valve, and it's obviously not the right one.

Actually, I would call that a typical bracket mounted inline shutoff valve. The question I would ask is if the valve is working and allowing fuel flow from one tank to the other.

That's a typical shut off valve. Take pictures of your mower, the valve picture, model number and serial number to your dealer and have him exchange it for the correct 3 way valve. With that valve, you will never get any gas from the other tank. Your dealer may be able to receive text messages and you can send him your information before going down there. This time of year there is typically a 3 week wait on repairs.

Thanks for the replies! Talked to my dealer and they’re going to swap it out. But, you are right about the wait time. I’m just going to get by with one tank until the cutting season is over. We’re getting a lot of rain so I’m cutting every 5-6 days.

Hello,

It would be a quick check to find where the problem exists, by choking off both of the tank hoses at the valve with vise-grip pliers and a rag, then remove the hose ends attached to the valve.

Gently loosen the pliers on the side in question to see if the tank or line is blocked or the valve is the actual problem. The valve is a simple "gate" style valve and there is really nothing to come loose or break inside them.

If there is still no fuel flow when the pliers are loosened, the blockage is at the tank or in the line from the tank is in question.

I would not be surprised if there is a slip-on rubber cap on the valve nipple or the tank nipple that someone missed during the machine assembly process. The selling dealer would not know this from their pre-delivery setup and inspection.

Those rubber caps are put in place on fittings, by the part manufacturer, to prevent bugs from making a nest in the open port fittings.

Talked to BB dealer who was at the Buckmasters show, and he said the valve is correct but could be a dirt dauber nest or some other obstruction. He said, "I don't know how they get in there, but they do." I will probably try Auto Doc's suggestion when I get some time next week. I've got to drain most of the gas out of that right tank in case I have to take the tank nipple off.
Thanks!

rainman14624 said:

Talked to BB dealer who was at the Buckmasters show, and he said the valve is correct but could be a dirt dauber nest or some other obstruction. He said, "I don't know how they get in there, but they do." I will probably try Auto Doc's suggestion when I get some time next week. I've got to drain most of the gas out of that right tank in case I have to take the tank nipple off.
Thanks!

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How can the valve be correct? It's obviously just a shut off valve. The valve should have a left, right, and off setting.
This is your valve. https://powermowersales.com/badboymowers-067-6059-00

hey everyone - look at the photo. It looks like there is only one hose in and one out hose (yellow arrows). There is also another hose tucked deep up under (blue arrow) There are two tanks. Gee, where does the hose from the second tank end up? Is it a Y, is it another valve? Is it a crossover? Plug in the end? Trace each hose to see where it goes. It cannot be open or all the gas would run out. If the valve had 3 connections on it, is one plugged up?

sgkent said:

hey everyone - look at the photo. It looks like there is only one hose in and one out hose (yellow arrows). There is also another hose tucked deep up under (blue arrow) There are two tanks. Gee, where does the hose from the second tank end up? Is it a Y, is it another valve? Is it a crossover? Plug in the end? Trace each hose to see where it goes. It cannot be open or all the gas would run out. If the valve had 3 connections on it, is one plugged up?

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The hose you highlighted in blue is a vacuum or vapor hose. It appears to be one fuel line in and one fuel line out. The one on the outlet side probably goes to the fuel filter.

rainman14624 said:

Talked to BB dealer who was at the Buckmasters show, and he said the valve is correct but could be a dirt dauber nest or some other obstruction. He said, "I don't know how they get in there, but they do." I will probably try Auto Doc's suggestion when I get some time next week. I've got to drain most of the gas out of that right tank in case I have to take the tank nipple off.
Thanks!

Click to expand...

Where is the line that leads to the carburetor come from? They may have it plumbed so one tank is the primary and the other is the reserve. If is not that then someone (creative shop tech) changed the line around to only work with only one tank.

When I was at a local John Deere dealer as a service manager, I had such an incident on a dual tank commercial rider that came in for a municipal contract. The tech quit before I discovered several problems that he had created with a few units.

Hopefully it is just a simple blockage issue.

so where is the second line? Do they go to a Y then the on/off valve? Is one stuffed with a plug in the end? Should not be hard to figure out.

I never heard of or seen a dirt dauber that can survive gasoline long enough to do anything.

But I would first trace the lines to see what BB actually did. But a just an on/off control can't switch between tanks. If they such a valve then they were draining both at the same time. Just much easier to re-plumb to a regular three way valve and change the label.

StarTech said:

I never heard of or seen a dirt dauber that can survive gasoline long enough to do anything.

But I would first trace the lines to see what BB actually did. But a just an on/off control can't switch between tanks. If they such a valve then they were draining both at the same time. Just much easier to re-plumb to a regular three way valve and change the label.

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I agree. However, I believe that Bad Boy installed the wrong valve at the factory. The OP has a Maverick HD. It has two tanks. The standard Maverick only has one tank. A mistake could have been made on the assembly line.

Well according to IPL for that 2023 model [lookup by the serial number given] the label is correct and when I look at the fuel tank setup they don't even list a part number for item 171 [fuel valve and hoses].

After doing some more digging, drawing fuel from the right tank only is a common problem. Change out the fuel cutoff valve with a 3 way. The fuel lines will attach to the 3 way and allow you to draw from either tank and shut off fuel at the valve.

StarTech said:

Well according to IPL for that 2023 model [lookup by the serial number given] the label is correct and when I look at the fuel tank setup they don't even list a part number for item 171 [fuel valve and hoses].

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Fuel breakdown on previous drawing

Which is the 3 way valve but the parts diagram shows the label for the 2 way valve



And more interesting is the left tank is top draw and the right tank is bottom draw, so no way to draw from both tanks with a single on/off valve

ILENGINE said:

Fuel breakdown on previous drawing View attachment 71673

Which is the 3 way valve but the parts diagram shows the label for the 2 way valve

View attachment 71674

And more interesting is the left tank is top draw and the right tank is bottom draw, so no way to draw from both tanks with a single on/off valve

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Ding! Ding! Ding! You are correct. There is no way to get fuel from the other tank.

ILENGINE said:

Fuel breakdown on previous drawing View attachment 71673

Which is the 3 way valve but the parts diagram shows the label for the 2 way valve

View attachment 71674

And more interesting is the left tank is top draw and the right tank is bottom draw, so no way to draw from both tanks with a single on/off valve

Click to expand...

Apparently I'm using the wrong Bad Boy Website [https://www.badboymowerparts.com]. What is web address of the site that you used? Maybe I need to update which I am using.

Reading this thread and wondering... Do some models really come with a 3-way valve that the user has to change to switch tanks? On my 2021 Rogue it has two tanks but they seem linked because fuel is consumed from both and I don't have to do anything. Wouldn't it make more sense that there are hoses from both tanks to a T and then the resulting line feeds to a simple fuel shut-off valve? It would seem to be a pain in the ass for the user to have to run one tank dry and then manually flip a valve to start using from the other tank.

BigBlueEdge said:

Reading this thread and wondering... Do some models really come with a 3-way valve that the user has to change to switch tanks? On my 2021 Rogue it has two tanks but they seem linked because fuel is consumed from both and I don't have to do anything. Wouldn't it make more sense that there are hoses from both tanks to a T and then the resulting line feeds to a simple fuel shut-off valve? It would seem to be a pain in the ass for the user to have to run one tank dry and then manually flip a valve to start using from the other tank.

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Most, if not all, commercial mowers have a 3 way fuel valve. The Bad Boy Maverick HD is one step below what is considered a true commercial mower. In fact, it has Hydro-Gear ZT-3400 transaxles. You will find the ZT-3400 on many entry level commercial mowers. Most mowers with two tanks have 3 way valves.

BigBlueEdge said:

Reading this thread and wondering... Do some models really come with a 3-way valve that the user has to change to switch tanks? On my 2021 Rogue it has two tanks but they seem linked because fuel is consumed from both and I don't have to do anything. Wouldn't it make more sense that there are hoses from both tanks to a T and then the resulting line feeds to a simple fuel shut-off valve? It would seem to be a pain in the ass for the user to have to run one tank dry and then manually flip a valve to start using from the other tank.

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It is so you have reserved fuel if you run out on the back 40 and it give a hint you are low on fuel. Besides what if you bust one of the tanks with them feeding at same time you are dead in the water.

StarTech said:

It is so you have reserved fuel if you run out on the back 40 and it give a hint you are low on fuel. Besides what if you bust one of the tanks with them feeding at same time you are dead in the water.

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I don't know. The Rogue is the only mower I've had with two tanks and mine are linked. Works great for me. As for the 'bust one of the tanks' problem... well, almost every other piece of equipment out there only has a single tank so that seems like a pretty unlikely situation to consider twin tanks and a 3-way valve a benefit.

So what do you do, mow until you run out of fuel and then switch the valve and start it back up? How does your fuel gauge work then? Or are there individual gauges for each tank?

StarTech said:

Apparently I'm using the wrong Bad Boy Website [https://www.badboymowerparts.com]. What is web address of the site that you used? Maybe I need to update which I am using.

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Now that manual has the info. The other site didn't have that parts section, Thank you.

Bookmarking that site. Again Thank you.

BigBlueEdge said:

So what do you do, mow until you run out of fuel and then switch the valve and start it back up? How does your fuel gauge work then? Or are there individual gauges for each tank?

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Each tank has an individual gauge. I often mow till one tank is out of fuel. It doesn't hurt anything. Besides, most of those fuel gauges don't last very long.