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From: Arild Jensen (no email)
Date: Fri Apr 20 2007 - 09:09:49 EDT
> -----Original Message-----
> if you have a full tank, there's a lot more mass of fuel to operate as a
hygroscopic
> "pump" than if the tank is nearly empty. The nearly empty tank
> will surely produce more condensation but that's not the point. The point
is how much
> water gets to the bottom of the tank to allow "bugs" to react with the
fuel.
REPLY
something I haven't seen any detailed data on is how the newer common rail
engines handle the pressuer pump.
In fuel injected gasoline engines, the pump runs hot as a result of trying
to pressurize the main rail.
The vehicle designers decided to place the pump in the fuel tank so th efuel
can act as a coolant.
I have not seen any equivalent arrangement for boats, nor have I seen
mention of having to place a fuel pump in the tank on older boats being
repowered. Presumably these new engines also have pumps that run hot
whiel pressurizing he common rail.
So my question is how do they cool th epump. With a fuel bypas? If so that
should means the engine has a much higher return flow rate. And the
remaining fuel in the fuel tank will become correspondingly warmer.
This heat is also a contributing factor in causing water absorption into the
fuel.
regards
Arild
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