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Hi, this is prob a very obvious question and probably relates to all classic car fuel tanks... but...
Im used to working on the volvo 340 which has a fuel overflow pipe and an expansion tank system for the tank.
However, Ive recently been working on my volvo 66's fuel tank and am a bit puzzled....
What I dont understand is how does this tank vent as the tank heats up and the fuel evaporates in the hotter weather?
On the 340 is an overflow pipe plus a additional expansion tank system on the later cars. The earlier cars dont have the expansion tank. However, all 340s have an overflow pipe on the tanks.
Im puzzled by this volvo 66 tank as there are only 3 pipes on the tank- first, the inlet - with the filler cap on, second the smaller pipe from the top of the tank to the filler pipe ( that I guess allows air out the tank as fuel flows in) and third the outlet pipe which goes to the fuel pump.
However, as the tank heats up on a warm day how does the tank vent or release this pressure?
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