914 smog testing, Whats required in your area? Options

[JeffBowlsby]

I had to smog my DD today and noticed this sign in the waiting room, which would be applicable to the 1976 914s. Tech says they pinch off the evap system (tubing and charcoal filter between the fuel tank and air filter box) and insert some kind of gas under low pressure to test the evap system, for leaks.

What other testing is required in your area, if any?

[JeffBowlsby]

Good thread! The masochist in me has never been afraid of the CA smog reqs for the 76 cars. Never knew about this test until I saw the sign. Technically all 914s are required to pass this test even those that do not require smog testing, but that is another topic.

So on a 914, two clamps would actually be needed for this pressure test, testing the hoses and connections between the fuel tank, expansion tank and charcoal canister. Pressure testing the air filter housing would be good too if a block-off at the throttle body could be devised.

2 psi does not seem like a lot but other pressurized systems operate at low pressure - like the natural gas plumbing in your house.

I wonder how many 914s would pass this test due to old vacuum lines or leakage of these components? The end cap easily pops off the plastic charcoal canisters and probably 99.9% of the vacuum lines in this circuit are 40 years old and loose at the fittings. They should at least require passing this test for 1976 concours 914s...