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Fuel Return line flow amount.

would that be different from the amount of fuel that falls to the ground? LOL My truck is like a harley, it leaves little tell-tale signs of its been there. LOL
 
Doesn't is very on the demand?

I'm sure it does, but roughly.

At idle when I pop a return line of its a little dribble. Not sure what its like under load.

Is it a little bit, or is it a lot? It must be a little amount.

Those scanner readers that read MPG's read incoming fuel. What they don't measure is return fuel. Just a curiosity thread is all.
 
Varies, relative to the pressure and volume of the lift pump - return will be greater at idle, reducing as rpm and loading increases - that's where yer supply pressure is ~6psi at idle, dropping to 0psi at fwot - most return is from the 'metered' return ports of the injectors
 
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