GordnadoCRD wrote:
There is another possible source of leakage at the fuel filter head. Even if you have the filter properly installed, and even if it isn't leaking it's self, fuel can still drip down and pool where you describe.
If you remove the filter, then remove the fuel filter head, then turn it over, you will see that the part that the filter threads onto is essentially a double-male fitting with hex in the middle. This fitting is the only thing that holds the fuel heater/fuel temperature sensor ring 'donut' to the body of the filter head.
There is an o-ring gasket between the heater 'donut' and the filter head body. If this o-ring has been compromised OR if the fitting isn't tight enough, diesel can seep at this point, and will pool at the top of the filter, and in back as described.
If you pull this apart, make sure to scribe a mark on the filter head body and on the 'donut' so it goes back indexed correctly.
It's also possible that the plastic shell of the 'donut' has cracked and permitting seepage that way.
Good thought on the "O" ring between the two parts; the fitting could simply be loose!
and you stated: "If fuel can leak out, then air can leak in."
Do not believe this is possible with an in-tank pump since the entire fuel system all the way from inside the tank to the back of the CP3 is under 10-15 psig of pressure so fuel will always leak out and air will not leak in at any leak point in the system....
If any air were to somehow leak in like say when the engine is off, it would be expelled immediately as soon as the key it turned on and the pump pressurizes the system
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