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TR4 TANK PULLING VACUUM


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Hi Everyone,

                       A quick set of related questions. Whilst draining the aluminium fuel tank on my 1964 TR4 ready to install R9 grade fuel hose everywhere, I hadn't opened the fuel tank cap and noticed that when I did it hissed as the lid was raised. The tank was less than half full. Is there a vent anywhere? Do I have anything to worry about?  I am hoping that flow to standard layout Strombergs will not lead to disaster in normal flow demand from the tank. Am I correct, or is there a vent somewhere that I need to sort out?  Fuel cap is standard flip up type.

Best wishes    Willie

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Hi Willie,

 the standard steel TR4 fuel tank has vent pipe. So this would not cause any vacuum.

The TR4A has a drill hole in the filler cap amd should not cause a problem.

It maybe that your fuel pipe drain was greater than normal usage and the drill hole could not cope.

So !!!! have you got a drill hole vent anywhere near the filler cap.??

If you drive the car a good distance. Stop and quickly lift the fuel cap - does it give a sucking sound. it should not.

 

Roger 

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Thanks Roger. I haven't noticed any sucking sound, but the gauge does read low when the car is in motion! Does that Indicate a problem?  I expected to find a small hole in the filler which had been blocked by waxing the car, but none evident, hence my original Q. How does a normal set up vent the tank?

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