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Fuel tank pressure

General Tech Talk

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Fuel tank pressure

Post by brighty »

Is a fuel tank meant to have a positive, or negative pressure when the fuel cap is opened.

eg, is it meant to let air out.... or suck air in????
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Post by -Scott- »

I always thought fuel tanks breathe through the vehilce's carbon cannister.

But some tanks definitely generate a pressure differential, so FIIK!

Scott
Last edited by -Scott- on Wed Jul 12, 2006 7:22 pm, edited 1 time in total.
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Post by simkell »

there shouldn't be a vacume if any thing a slight amount of pressure.

if there is vacume it will affect a mechanical pump in providing enough fuel to either diesel pump or petrol carby.
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Post by V8 Middy »

What Scott said... modern vehicles have a vent pipe into a charcoal canister which then has a vacuum lne into the intake manifold so really there should be no pressure or vacuum when u take the cap off.

My tank heats up and pressurizes when I run on LPG but I'm yet to figure out why but thats another story...
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