Fuel system diagram needed

[kcpaz]

anyone know where I can find one?

[LetItSnow]

Courtesy of JaySVX's signature: <click>

[kcpaz]

I looked through that, it's not in there...... onless I missed something.

[Hocrest]

Are you looking for the electrical or the plumbing?

[kcpaz]

I need plumbing, not wiring

[TomsSVX]

in the engine bay??

Tom

[kcpaz]

yeah pretty much. The tank is just feed and return right?

[Hocrest]

Hope this helps...

[kcpaz]

basically what I'm trying to figure out is why there are 3 fuel hoses coming out next to the intake manifold rather than just two. Are there 2 feed lines and one return, or 2 returns and 1 feed?

[Hocrest]

Originally Posted by kcpaz

basically what I'm trying to figure out is why there are 3 fuel hoses coming out next to the intake manifold rather than just two. Are there 2 feed lines and one return, or 2 returns and 1 feed?

From front to rear;
Fuel Supply -> engine (high pressure hose, screw clamp)
Fuel Return -> tank (high pressure hose, screw clamp)
Fuel Vapor -> cannister by ABS pump (fuel vapor hose, spring clamp)

[kcpaz]

what would happen if I caped off the vapor line (engine is going in a 911)? any negative affects on driveability

[TomsSVX]

your tank cannot vent and will prob cause vapor lock unless you are plugging the engine side only

Tom

[kcpaz]

here's why I'm asking for a diagram. I'm building a custom fuel tank and the tank is going to have a vent, but the Porsche fuel system is obviously different than the Subaru system. I haven't decided if I'm going to be running any emissions controls so I'm not sure if I'm going to vent through a charcoal canister or just to the atmosphere. If I can pass a visual inspection without it, then I won't put it in. I just need to know how the Subaru system works so I can modify the fuel rails with AN fittings and fun the fuel lines in a way that will work with the engine controls.