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How much does it take to fully mix #4116553 06/06/16 09:09 AM
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SpeedyG75VW Offline OP
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Just wondering what everyone's opinion is on how much it takes quantity wise to fully mix in an additive. Most instructions for additives say to add to an empty tank before filling up with gas. I would think even with a tank nearly full, the additives would mix well after pumping in a couple gallons of gas....just because of the flow rates and pressure at which the gas is coming out of the nozzle.

Re: How much does it take to fully mix [Re: SpeedyG75VW] #4116572 06/06/16 09:24 AM
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Ethan1 Offline
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The gas sloshes around as you drive anyway

Re: How much does it take to fully mix [Re: SpeedyG75VW] #4116590 06/06/16 09:36 AM
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It's the slosh that will do the mixing. The flow from the nozzle has little to do with it. But it does wash all the additive down the fill pipe smile


Formerly in marine engineering. In an earlier life I owned my own petroleum tank truck, and hauled for the majors and independent's.
Re: How much does it take to fully mix [Re: SpeedyG75VW] #4116601 06/06/16 09:42 AM
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4wheeldog Offline
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EFI vehicle recycle substantially more fuel than they burn. A few miles of that agitation in the tank will mix anything up.

This also accounts for why FI vehicles are able to deal with striating ethanol fuels so well.

Re: How much does it take to fully mix [Re: 4wheeldog] #4116614 06/06/16 09:51 AM
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440Magnum Offline
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Originally Posted By: 4wheeldog
EFI vehicle recycle substantially more fuel than they burn.


EFI USED to do that in the 90s (and a few carb'd vehicles did that in the '60s, such as 440- and Hemi-powered Chrysler muscle cars).

But return-flow EFI pretty much went away with tightening emissions rules in the mid 90s. The reason for fuel return was to always keep the fuel in the rails (or carb on the older engines) cool, reducing vapor lock. The problem is that the fuel carries heat back to the tank as you drive. The constant circulation heats the fuel in the tank, increasing the evaporation rate, which increases pressure in the tank until the cap vents vapors. Returnless EFI keeps the tank cooler and reduces vapor venting.


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Re: How much does it take to fully mix [Re: SpeedyG75VW] #4116675 06/06/16 10:37 AM
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The regulator in the new single pipe systems in built into the pump and bleeds off some fuel. That flow should help mixing. Some systems have a feedback loop from the ECU to the fuel pump motor to vary speed based on demand.

Re: How much does it take to fully mix [Re: SpeedyG75VW] #4116680 06/06/16 10:40 AM
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We should alway add the additive(FSC) prior to filling the tank as many gas tanks have a check valve after the filler neck(in the tank).

And just adding the additive/FSC isn't enough to push open the check valve(causing it to sit in the filler neck) but, the force of filling the tank is certainly enough to push it through! Then, normal driving will mix the two together.


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Re: How much does it take to fully mix [Re: SpeedyG75VW] #4116804 06/06/16 12:38 PM
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raytseng Offline
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What confuses me also is is the compulsive need to get your tank to empty before doing an additive.

Don't you think 10gallons of fuel or 5gallons or even 2gallons of fuel is enough to wash the additive down.

2gallons is 2 full milk jugs if you visualize it. If you get your hands soap, you don't need 2 gallons of water to wash the soap off your hands.


So if you really want to do your additive now but you're at 3/4 tank, just go to the station and top off your tank.

And if you don't end up getting all the additive in, or it doesn't mix perfectly, well it'll get washed down the next fillup. You're not running only 1 treated tank completely empty anyway. It's a continuous system.

Re: How much does it take to fully mix [Re: SpeedyG75VW] #4116823 06/06/16 01:03 PM
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if you're considering this additive, you might have used another already.

not much chance of additives clashing if you used up the previous fill first.


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Re: How much does it take to fully mix [Re: raytseng] #4117450 06/07/16 06:05 AM
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Right, I agree with raytseng!
No need to be as close to empty before dumping in the additive. As long as(IMO) you are filling the tank after putting in the additive, which may just sit in the filler neck("if" the tank has a check valve). Meaning, pushing the additive through the filler neck with the force of the gas pump. Just my opinion!


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