Just wondering
Thread Starter
Racer
Joined: Jan 2001
Posts: 386
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From: Ludlow Ma
Just wondering
So my fuel system is 'pressurized' as it all releases when gas cap is removed.
So how does water get into the tank during a heavy rain if the drain in the tank fill rubber surround (boot) is plugged with leaves or whatever? I mean it's 'pressurized' right?
So how does water get into the tank during a heavy rain if the drain in the tank fill rubber surround (boot) is plugged with leaves or whatever? I mean it's 'pressurized' right?
Race Director
Joined: Oct 2005
Posts: 11,772
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From: Rolla Missouri
2021 C4 of the Year - Unmodified Finalist
St. Jude Donor '10 thru '25
The "pressurized" part of the system is from the fuel pump to the injectors.
Not so much the fuel tank, although there can be some pressure build up.
But that is from the normal heating/cooling cycle of the surrounding atmosphere.
You can prove this, by taking the fuel cap off and noticing the engine will still run.
Although (at least on later models), it will cause the "Check Engine" light to come on if left off or loose for any length of time.
Not so much the fuel tank, although there can be some pressure build up.
But that is from the normal heating/cooling cycle of the surrounding atmosphere.
You can prove this, by taking the fuel cap off and noticing the engine will still run.
Although (at least on later models), it will cause the "Check Engine" light to come on if left off or loose for any length of time.
Le Mans Master
Joined: Jan 2008
Posts: 7,030
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From: Edmonton, Alberta
