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If it was warm out and then you brought the car in hot and full of gas, you're going to smell gas. Carburetor fuel bowls are open to the atmosphere. Fuel will evaporate.

It is possible that a carb float is stuck open(and that is bad, as fuel will wash down into the cylinders and dilute the oil). It is also possible that your vent hose spilled some over(if you have one). If you have a vented cap, you're going to smell gas from time to time.

Open the garage door and run a fan to vent it out. Tell the wife to chill out. Old cars smell, just like old men.

The vent hose for the fuel tank is in the front trunk (frunk). It usually is fed through a hole in the frunk and down into the right front fender well. Get a longer length of hose and install it on the nipple on the side of the fuel filler neck, make a full loop or two, and feed the end back through the hole in the frunk and on the open end of the hose out that valve from the motorcycle fuel tank on the end.

When you completely fill the tank and make left turns gas will run out through the nipple on the filler neck and out the hose causing a strong gas smell while you are driving.

@Greg54 posted:

Thank you, Robert!

If you have any pics it would be really helpful. I just ordered the motorcycle valve. Can’t wait to put it on. The gas smell is pretty bad. It didn’t start until my last fill up.



I don't have my Speedster anymore so i can't post a photo. I'll see if I have an old one. Otherwise someone else here may have one they can post for you.

Beware of the one-way venting valves.  They Let air in as gas is consumed, and prevent vapors from going out.  The problem that can arise is if you park the car with rather little gas in the tank for a long time and the ambient gets cold,  So air goes in as that gas volume contracts.  Then the ambient warms up, and the air/vapor in the tank wants to expand but can't, so pressure builds.  It can be enough to overcome the float valves and then the float chamber overflows with gas and the gas goes down the throats, and in to the cylinders whose intake valves are open. Said gas can then go past the rings and if you're really lucky, fills the crankcase with gas on top of your oil.  If you happen not to notice this, and then fire it up, the result will not be good.  The gas/oil mixture will go out every available seam as the blow-by will apply some considerable pressure, plus the basic mechanicals of pistons going up and down, with lots of unapproved splashing.  Great quantities of smoke may be evident.  Ask me how I know.

I took my one-way valve out. I also store the car over winter with a full tank, so as to  minimize the air-vapor volume.  I route the vent hose up in a loop over the filler and just deal with a little gas smell now and then.  Bug whup, its a Speedster ...

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