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Gas Smell Troubleshooting

September 27, 2010 | Troubleshooting & Repair

By Geoff Fleming and Tony Ryan

Where to look when you smell gas inside the car

Geoff Fleming: You will have to do a once-over check of various areas. Start at the engine bay, since a gas leak there can result in catastrophe. Check carb floats and look for worn hoses ( especially the link behind the fan shroud that joins the metal lines.) and at the fuel pump. Another culprit, lurking just out of sight, is the rubber line from the body to the engine bay. It should be replaced every five or so years, as it becomes porous and causes fuel smells.

Next, I would examine the fuel cock. These are outboard on the T-6 series, (1962-1965). You might have developed a slight leak at the sealing surfaces. Check the hose connections too.

If really ambitious, or if the obvious suspects prove innocent, remove the tunnel covering and check that the flexible hose "elbow" on the fuel line hasn't given up the ghost. Likewise, a fuel tank can develop leaks along the seams.

Maybe your problem is simply a loose gas cap or one with a poor cap seal, in which case the fuel will slosh out when the car goes into a turn.

Tony Ryan: There is a short braided line in the passenger compartment sort of between the floor toe boards and just behind them. It's not hard to change it but it's a bit fussy because it's hard to get to. Remove the rubber mat and both toe boards. It's likely the leak and may very well be the original line.

Otherwise there is another braided line under the car under the gas tank where the fuel selector valve connects to the steel fuel line and another under the car in the rear on the left side of the transmission where the steel line exits the tunnel.

There is another hidden one between the fan shroud on the engine and the firewall midway between the carbs.

Braided line cracks with age and the cotton braid can wick away the leaking fuel so it evaporates so there may be no wet spot on the hose but you do get the gas smell.

USA 5/16" plain rubber fuel hose with hose clamps works very well and lasts much longer. You can get it any any auto parts store.