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06-04-2023, 10:39 PM | #1 | ||
FF.Com.Au Hardcore
Join Date: Jan 2005
Location: Hervey Bay
Posts: 5,147
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Little bit of BS trivia for everyone. Call it an Easter gift for you.
The fuel level is measured by a simple float on the end of a metal arm as in this pic. The arm runs down the outer passenger side of the tank and the float is the round thing at the end. Now, if you try to remove the fuel pump with 1/2 a tank or more of fuel, fuel will come flooding out that hole. As you can see, a considerable part of the tank is above the level of the fuel pump. At least 1/3 of the capacity, probably close to 1/2. So if any level of fuel greater than 1/2 a tank fills the lower chamber to the brim, which means the float is jammed against the roof of the tank, how does the gauge manage to display a lowering level of fuel when the tank is, say, completely full. The float is jammed hard against the top, so it wont move until the tank is 1/2 full or less. My only conclusion is the cluster guesses how much fuel is in the tank for anything over 1/2. Calculates the decreasing level based on fuel injected. But back on topic... I found these old pics I borrowed from someone on the net ages ago. There was a failure in the join around this white plastic bit. Which resulted in fuel leaking out when the tank was full. But only when the tank was full. As I said, hopefully not your problem. |
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07-04-2023, 11:24 AM | #2 | |||
Starter Motor
Join Date: Feb 2019
Posts: 8
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Quote:
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07-04-2023, 05:40 PM | #3 | |||
FF.Com.Au Hardcore
Join Date: Jul 2005
Location: Melbourne
Posts: 6,844
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Quote:
I do know if you fill it right up to the filler neck, the gauge will show full for a much longer period of time, obviously because there is no "sensor" on the neck, so there must be something at the top of the tank to give another reading?
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~~~~~~~~~~~~~~ Rides (past and present) Current: 2004 Ford Falcon 5.4L 3v Barra 220, Manual Past: Mitsubishi Sigma (m), Toyota Seca (m), Toyota Seca SX (m), Toyota Vienta V6 (m), Toyota Soarer 4L v8 (a), BA XR8 ute (m), T3 TE50 (m), BMW Z4 (m) AFF motto - If contrary views trigger, please use ignore button. |
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29-10-2023, 09:31 AM | #4 | ||
Regular Member
Join Date: Oct 2021
Posts: 98
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Hi,
My BF just did the same thing, petrol smell, after full tank, so all this info very helpful, petrol smell gone at about 1/2 tank - I don't drive the BF daily, so have time to follow all the steps .
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BF XR8 - Mercury Silver |
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