Kart tank, how low can you reliably pickup?

[Storbeck]

I have a kart tank, roughly 2 gallon total tank size, feeding stock 38mm carbs so it's just one fuel pickup, in the tank with the metal thing to keep the internal end of the fuel line near the bottom rear of the tank. I'm not using any reserve switch right now so it's just a line from the fuel tank pickup straight to the carb inlet, and another line from the carb return to the other pickup in the tank, so very short fuel lines.

Once the tank gets down to maybe 1/2-3/4 gallon left, everything is fine if I'm just driving around but any blipping and jumping and general tomfoolery and I start to get random bogs, which I'm guessing are from the fuel sloshing around away from the pickup.

It looks like what I have going on is pretty similiar to what a lot of people do with these cart tanks, wondering if people just put up with it and only use an effective ~1.5gallon capacity?

The combination of single pickup and single pump on the stock carbs with no reserve switch means a lot less total volume in the fuel system than a dual 44+ dual pump dual line, maybe with dual lines or a reserve switch there is enough volume in the total fuel system to act as somewhat of a "reservoir" for when the pickup is momentarily uncovered?

 

[Harbor]

I have clunk check valves on hose that follows the gas around in the tank, can run it dry without issue..

The clunks have the spring around the outside and check valve inside. My kart tank did come with a brass looking metal piece with a slit cut in the end but has no check valve

 

[OCD Solutions]

Yeah, the clunks will draw a tank right down to the last teaspoon. It's actually quite remarkable.

I've only drawn it down to empty a couple times and I don't recall any bogging.

The OEM style fuel filter under the rail of the ski and the larger volume clear aftermarket filters act as a buffer/separator as well. You didn't mention a filter of any kind so if you are running without or running a really small inline style, you might be more susceptible to air bubbles than others.

 

[Storbeck]

I have clunk check valves on hose that follows the gas around in the tank, can run it dry without issue..

The clunks have the spring around the outside and check valve inside. My kart tank did come with a brass looking metal piece with a slit cut in the end but has no check valve

I'm using one that is like you're describing that your kart tank came with. I also have one like you're describing with the spring but it doesn't fit through the hole for the pickup in the cart tank, so I used the one without the check valve.

Maybe I need to switch to the one with the check valve?

I have only a very small inline filter.

 

[Harbor]

I'm using one that is like you're describing that your kart tank came with. I also have one like you're describing with the spring but it doesn't fit through the hole for the pickup in the cart tank, so I used the one without the check valve.

Maybe I need to switch to the one with the check valve?

I have only a very small inline filter.

I think I pulled the hose up thru the cap opening and installed the clunk.. I also use a very small filter. The clunk will keep your line fuel of fuel. You might put new intank hose at the same time in case is a pin hole at the described fuel level.

Edit: Iam also using rubber OE style fuel line in the tank, cut long enough fir the clunk to follow the fuel.. The colored hose gets hard and stiff

 

[eastcoastjumper]

Oem hose & i lay the clunk on the bottom back corner of the tank and make the lines a hair longer to do so

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