Your car spitting gas could be caused by a few things such as a jumping timing belt or a stuck valve.
First, it could be a timing issue. As mentioned before, if your timing belt jumps, your cart might spit gas. To fix this, either the timing belt needs to be readjusted or it needs to be outright replaced. The jumping may also be caused by your camshaft timing gear.
You need to replace those if they’re busted. It’s recommended that you use metal camshaft timing gears rather than ones with plastic teeth.
Second, it might be a stuck valve causing gas spitting. If any of the valves in your engine are stuck, you need to go in there and free it yourself. Using aftermarket valves increases the risk of this because the valve might not have the exact measurements suited for your cart.
Try to get official stock parts, and if you can’t, be aware that stuck valves might be what is causing your gas spitting problem.
Third, if your golf cart is spitting gas, you may need to replace your air box. A relatively common problem is getting replacements that aren’t the stock air box for your cart. Something that most people don’t know or forget about is that if you’re using aftermarket filters, you absolutely must reset your carburetor.
If your golf cart carburetor is spitting gas, it probably has something to do with your float. It’s probably set too high. Setting it low might solve your gas spitting problem.
If that doesn’t do it, it may be that your float seat is busted. If this is the case, you need to replace it outright.
Another thing that might be causing your gas spitting problem could be your float needle! Your needle might be installed and aligned wrongly. If your needle is damaged though, you’ll need to replace it.
Problems with the timing chain in your cart might also be making your carburetor spit gas. If you have a timing belt that jumps, it’s probably causing your gas spitting problems. Jumping belts are more common when you have plastic camshaft timing gears rather than metal timing gears.
Lastly, bad reeds can lead to gas spitting. Check your reed valve and if anything is amiss, getting new reed leaves will likely solve the problem.
The most likely cause of gas spitting from the golf cart valve is due to the needle valve in the carburetor of your cart not working properly.
It’s not stopping fuel that flows into the carburetor right. This causes the fuel to continue to flow and eventually wind up in the engine crankcase. Your oil will probably be more than full because of this: the oil has been diluted with fuel!
If that’s the case replace the needle in the carburetor or replace the whole carburetor. The other thing that’s likely to cause gas to spit from the valve cover of your cart is your carburetor float being stuck open. This is simple enough to fix. Take off your carburetor, check the float and adjust the carburetor float as needed.