FULL vs EMPTY operation ... - Ford Powerstroke Diesel Forum
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Old 06-25-2013, 06:14 AM
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FULL vs EMPTY operation ...

So far my '95 had been running 'good' all the time ....

But I did notice, that after filling up the tank(s), it seems to run 'really' good.

Is that a sign of a weak fuel pump, or is it just that the pump has a little more 'help' from all the fuel ??
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Old 06-25-2013, 06:42 AM
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I see this too and I have e-fuel. To me it would seem that the fuel in a full tank is cooler (denser) than the fuel in a near empty tank. Unless you have e-fuel it is a real shocker how hot the return fuel is going back to the tank (and really if you think about it it is about the same temp as the coolant (170-200*) since it all runs through the heads unlike any other vehicle out there with fuel delivery lines to each port). In a empty tank you just pull that hot fuel back into the system where the heat would have dissipated into a full tank of fuel. Well, that's what I've been thinking is going on.
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