Anyone have this problem
 

When its hot out side I can smell gas coming form my vent, it gets worse when I check under the hood (only when its a hot day) what does this mean

Could it be running too rich ? Your A/C runs off vacuum, so if it's running rich and you're getting blow-by, the fumes will in turn go into the vacuum hoses and open the vents, and you could actually smell the gas.

Just my .02, again, I'm not for sure, so don't quote me on this.

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88 GT Droptop. Not sure about the heads, stocks shaved mebbe. Intake, stock, think there's some work. Flowtech headers, off road h-pipe, flows, 3.55 FoMo., aluminum driveshaft, C-4 trans. w/ B&M shifter, Ram air, and more on the way.

I had the same problem when running rich. I've got a carb and the smell was overpowering. After fixing a bad float the smell was gone.

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1984 1/2 GT350 (#842 Hatchback w/ T-tops), 302HO, Comp cams Xtreme Energy cam, Carter 625cfm carb, Weiand Stealth intake, MSD distributor, MSD coil, FMS 9mm wires, 1 5/8" MAC unequal shorties, 2 1/2" MAC Prochamber H-pipe, Flowmaster 2 chambers, KYBs, 16"x8" 4 lug Cobra Rs, Falken 245/45ZR16s

another vote for the too rich theory.

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1987 black with t-tops. Cobra intake, 1.7 cobra crane rollers, gt40p's, bbk shorties, off road h-pipe, Holley adj. fuel pressure regulator, Tremec t-5z, 65mm TB, 4.10's, adj cable, 155lph fuel pump, Ram clutch kit, 3 row motorsport radiator,
275-60-15 BFG TA's on Welds, Hurst shifter,Former AOD Semper Fi

My guess is that the excess heat is causing the gasoline in the tank to vaporize and then is getting pushed up to the charcoal canister. I would check the vacuum line going from the charcoal canister to the intake for cracks or holes.

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351W 89 Mustang GT Convertible

hey jimberg what is the charcoal canister

It's the little black box toward the front just forward of the air pump. It's there to collect fuel vapor coming from the fuel tank and then release it into the intake to be burned.

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351W 89 Mustang GT Convertible