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| EFI overall design: how does a slosh tank fill without overflowing? |
Subject: EFI overall design: how does a slosh tank fill without overflowing?
by smellsofbikes on 2020/10/16 15:26:22
I'm trying to figure out whether it makes sense convert to fuel injection, probably via something like the cheap EFI thread.
The modifications to the intake system all make sense.
What I'm wondering: I'd like to use a slosh tank in the engine compartment that the regulator dumps into, so the electric fuel pump pulls from that, the fuel goes to the injector, excess fuel returns into the slosh tank, and then I can build it with baffles and stuff so I don't have to mess with the main fuel tank, and just draw calm, non-bubble-filled fuel from it to refill the slosh tank.
So how do I set that up? What I was thinking of was using the existing mechanical fuel pump to fill the slosh tank, and then I don't have to run a return line back to the main tank. (This isn't in a Datsun and the car it's in has difficult access to modifying the fuel tank, so it's really hard to put a baffle in, for instance.)
But if the mechanical fuel pump is running uncontrolled it'll overfill the slosh tank. I need something like the float valve/needle to restrict it.
Is there a way to set this up so there's no return to the main tank?
I can think of some ways to do this involving ECU control of the electric fuel pump, so it only pushes in as much fuel as the injector needs and there's no return at all, but that's a big chunk of software and tuning that I don't really want to get into.
I could use the slosh tank as a baffling system to reduce most of the bubbles from the high pressure fuel spraying into it, and then run an unpumped drain line from the bottom of that tank to just dump into the main tank, hoping it won't be sufficiently turbulent to get bubbles in the line going forwards.
(I know the recommendation is "just don't ever go below 1/4 a tank" but I'm not the only driver of this car and am dubious that rule would get followed.)
Any thoughts on how y'all would design this?
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