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How much vacuum should a fuel tank encounter under idle? I recently replaced the fuel sending unit on my 71 Duster 225 and noticed the fuel cap hissing from vacuum.

I have a Duster with a 225 slant six and was going to purchase a new tank/sending unit. The plan is to someday install a 360, so should I install the larger sending unit size, 3/8, or is the stock size adequate, 5/16? Thanks.

I have a 71 225ci Duster with a ECS fuel tank. I am planning on replacing the tank and was wondering if I should stick with an ECS tank, or replace it with a tank with no vent tubes. Does the ECS hurt engine performance? I also noticed that a tank is available with only one vent tube...any...

Can anyone give their opinion on what type of fuel to use in vintage automobiles? Not for race purposes, just stock vehicles. Octane rating, additives, ethanol in modern gas, absence of lead, etc. Thanks