Hmm. This would explain the extra gas mileage I get on hot days if the hot tank builds extra vapors to send and mix with air, the wide band 02 would sense the extra power and restrict more fuel when in lean burn.
On one hot day I swear I could accelerate off of very little throttle this would help explain why
Quote:
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Vent lines from the fuel tank and carburetor bowl route vapors to the EVAP storage canister, where they are trapped and stored until the engine is started. When the engine is warm and the vehicle is going down the road, the PCM then opens a purge valve allowing the vapors to be siphoned from the storage canister into the intake manifold. The fuel vapors are hen burned in the engine.
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Although now I'm thinking the fpr would give the best readings of engine fuel and vacuum draw but realistically the engine vacuum reading would be the exact same at every tap
To conclude I'm going to stick with the evap line just because it was easy to Tap and has a larger diameter