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Old 06-27-2017, 02:54 PM
2_Liter_Turbo 2_Liter_Turbo is offline
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Default S14 Fuel Tank Bulkhead

Trying to figure out exactly how the factory fuel tank bulkhead works. Can't find much on the interwebs, so if anyone happens to know, feel free to share. Educated guesses welcome as well, ha ha.

So here's the factory fuel tank. The green arrows are the typical fuel pump outlet and fuel return positions. The red arrows are a hose that goes to the bottom corner opposite of the fuel bulkhead from the bulkhead.


Here's a closeup of the fuel tank bulkhead itself with the same arrows.


Here is the bottom side where the return line and the tank corner hose "T" into each other. My hypothesis is that it uses vacuum generated by the return line flow to pull fuel from the opposite corner to dump it on the side the fuel pump resides. My question is, is there a check valve in this assembly? I can blow all directions through the ports, but some have more resistance than others.
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Old 06-27-2017, 08:09 PM
djsilver djsilver is online now
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No check valve, but exactly as you theorize. The fuel coming back from the pressure regulator goes thru the "eductor" and constantly pulls fuel from the left side to the right side where the pump is located. No control necessary, as any extra pulled over just overflows back to the left side. No check valve needed, as there's no way it can work backwards or siphon to starve the fuel pump. If FPR is turned up until it doesn't return anything, or if the fuel pump is dying and there's not enough return, the eductor won't work.
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Old 06-27-2017, 09:27 PM
2_Liter_Turbo 2_Liter_Turbo is offline
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Quote:
Originally Posted by djsilver View Post
No check valve, but exactly as you theorize. The fuel coming back from the pressure regulator goes thru the "eductor" and constantly pulls fuel from the left side to the right side where the pump is located. No control necessary, as any extra pulled over just overflows back to the left side. No check valve needed, as there's no way it can work backwards or siphon to starve the fuel pump. If FPR is turned up until it doesn't return anything, or if the fuel pump is dying and there's not enough return, the eductor won't work.
Awesome, totally makes sense now. Thanks for the response!
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