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1987 - 1996 F150 & Larger F-Series Trucks 1987 - 1996 Ford F-150, F-250, F-350 and larger pickups - including the 1997 heavy-duty F250/F350+ trucks

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Old 03-31-2012, 06:59 PM
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V10man V10man is online now
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Gas is almost $4 a gallon here. I want every last drop. Even if it is vapor. Speaking of vapor I hope you do something safe with the line. Gas goes BOOM real pretty like.
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Old 03-31-2012, 07:48 PM
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Quote:
Originally Posted by DBGrif91 View Post
If this is just FUEL VAPOR, what exactly is the point of having the canister? Why couldn't the vent line run direct from the tank to the TB? And, further more, if this were the case, why would a purge valve solenoid be necessary? Why couldn't the canister and the purge valve be eliminated altogether and just have a line running straight from the tank to the TB?
The function of the canister is to store vapor to be used by the engine at a later time. The function of the purge solenoid is to allow the engine to use the vapor when told too by the computer. They cannot be bypassed in the manner you speak because engine vacuum would create negative pressure in the tank, and suck raw fuel into the engine.
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Old 03-31-2012, 09:06 PM
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Quote:
Originally Posted by BrianDguy View Post
The function of the canister is to store vapor to be used by the engine at a later time. The function of the purge solenoid is to allow the engine to use the vapor when told too by the computer. They cannot be bypassed in the manner you speak because engine vacuum would create negative pressure in the tank, and suck raw fuel into the engine.
Thank you for the simple & direct explanation. Rep point 4 you.

I did not know [or realize, because it seems an obvious problem] that the engine vacuum would cause that to happen.
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Old 03-31-2012, 09:06 PM
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