Gas pouring everywhere

[Todd_S]

72' 240 with orig carbs.

There is gas pouring from the rear carb float overflow. Took the float chamber cover off and the float seems to be closing the valve. What could it be?

Thanks for any help you can give.

[ezzzzzzz]

First thing that comes to mind is the float is set too high allowing fuel to pour out at the nozzle. It could be trash in the needle seat not allowing the float to actually cutoff fuel flow from the pump. This is assuming that all was good at some point and this just started????

[Arne]

What kind of fuel pump are you using? If it's an electric that delivers more than 5 psi, it can overpower the needle valve.

[Bruce Palmer]

This thread is everywhere!! ;^)

[chepito]

My car has the same problem. My mechanic said the carbs are junk and I should think about getting new ones or ? which translates to $$$$. Is there a way to fix this? What are my reasonably priced options? Oh yeah it's a stock 260Z with the SU's.

[lostforawhile]

My car has the same problem. My mechanic said the carbs are junk and I should think about getting new ones or ? which translates to $$$$. Is there a way to fix this? What are my reasonably priced options? Oh yeah it's a stock 260Z with the SU's.

why would you trash the carbs? just get a new needle and seat set if needed. the float bowl is seperate,the only thing in there that could cause that is the needle or seat. hey can you tell me where the overflow/vent hoses go on a stock Z? do they go to a charcol canister?

[JimmyZ]

There could just be some crud in your needle valve. I took mine apart and found that it was seized. It had been sitting for a few years.

2c

Jim

[Curtis240Z]

hey can you tell me where the overflow/vent hoses go on a stock Z? do they go to a charcol canister?

To the backing plate of the stock air cleaner.

[lostforawhile]

To the backing plate of the stock air cleaner.

thanks,I thought about using the canister and making a solonoid valve open on ignition to vent the bowls,might work. cut down on gas smell anyway. then again,a real car is supposed to smell like fuel and oil.

[biddljj]

You go me laughing on this one...

I ran a 1941 Power Wagon for a snow plow for a lot of years.

During the summer this beast would just rest down by the creek.

One fall I climbed into the beast and it stunk bad.

Opened the hood... A golden Mantled Marmot had decided the

top of the flathead was home and died there.

I got the truck running but the smell of dead animal was

over powering me even though I had no door windows or floor.

FIX: I got a case of tomato juice and a bunch of tomato paste.

Mixed up the batch.... Warmed up the powerwagon.

Shut down the beast and dumped the mixture over the top

of the flat head... I let it sit for a couple of week.

Power washed the engine for the first time ever....

From then on the powerwagon smelled like pizza when it was at

operating temp. Kinda strange but much better that rotten marmot.

Jay.... aka zdisease

thanks,I thought about using the canister and making a solonoid valve open on ignition to vent the bowls,might work. cut down on gas smell anyway. then again,a real car is supposed to smell like fuel and oil.

[ktm]

If fuel is pouring out of the vent hose, then either the float is stuck, the float lost adjustment and is not closing the needle valve, or the needle valve is stuck open (assuming, as Arne suggested, that you are using the stock fuel pump).

Pull the needle valve and see if you can easily push it close. Blow into it while you are closing the valve as well and see if it is operating correctly. Measure the gap between the edge of the float and the float bowl cover. It should measure 14 to 15mm (or 0.5512 to 0.5906 in. - target 9/16-in. and you'll be in the range).