This is interesting. I thought you HAD to have a return style system. whats the best way to run a vac line back to the tank though? would have for that to get pinched or kinked somewhere and it doesnt work.It's a dead head system. I know guys with this system that run mid to low 9's on full weight cars. North of 850whp on ethanol. It supports way more than that.
This all being said, what keeps fuel in the bucket when the tank itself is getting low?
There are a 2 or 3 one way flapper valves that allow the fuel to enter the bucket, but don't allow it to run out once it's in.
But nothing says i can't add my own lol. I hate unvented gas cans
It has a "return" it's just right there at the regulator/bucket instead of the regulator being forward at the engine bay. The easiest way to think of it is that you have a feed line and a return line to and from a regulator, if you put the regulator away from the bucket/pumps, you have a return line. As you locate the regulator closer and closer to the bucket, that return line shrinks until it basically becomes zero. It's a returnstyle system, just with the return directly back into the bucket.
The bucket and fuel hat look bad ass!
Yep, I screwed up the calc. It's about a 1.6% change in volume for a 25F swing. In any case, the system has to be able to gulp air to keep negative pressures as bay as you consume the total volume of the tank. Here is a thread outlining the components.
That's fine, then you simply need to account for the moisture coming from SOMEWHERE. Because it's pretty well anecdotally documented that if you leave E85 in a tank for long periods of time, it not only begins to disassociate and layer, the hydrophilic nature of the ethanol draws in moisture. It's exactly why fuel stations offer "ethanol free" gasoline for small tools and engines that see long durations between uses.
Small gas engines have carburetors that are vented to atmosphere, so they are fundamentally different. I buy ethanol-free fuel for everything I own that has an atmospheric tank or carburetor vent. However, my ATV and PWC both have EFI and sealed fuel systems.
Who said it's controversial? I said I don't know the setting of the vacuum valve so calculating breathing is moot. However, I went ahead and did the math for the air displacement case and it turns out that 15 gallons' worth of air at extremely high humidity only contains about 1/3 of a teaspoon of water. My guess is that if you've witnessed water dropout in a Mustang that it came in with the fuel at the station.
All E85 comes with some amount of water already in it as ethanol is an aziotrope and you can't get it to more than about 95% ethanol using physical methods and typical pressures.
