Water
The Rodeo manifold has two seperate water parts in the inlet manifold. The thermostat housing and then the chamber under the runners. They are connected by a hose. The hose comes form the thermostat housing to the chamber under the plenum then the water goes off thru the heater system.
Save as and you can shrink em a bit with a picture veiwer so they come up full screen. lol. sorry to the dial uppers..

Colours mean the same as in the first pic.

Air, Vacuume and Fuel
First the IAC (Idle Air Control). Marked in Purple.

The water hoses are marked in Red. The thing marked in Yellow, is wired between the ECu and the Coil and provides the coil with constant big fat voltage.
The VSV (Vacuume Switching Valve) This switches the vacuume to regulate the fuel pressure. Marked in Yellow. Not too sure on how it works, you can see its got the three hoses, one from the front of the plenum. Another from the charcoal canister then to a Tee (the other hose is short and goes on the tit next to the one for the IAC valve). The last hose goes to the regulator.

The fuel reg inlet is circled in blue. Note: this fuel rail is the alloy type, the hoses are connected by way of banjo fittings. Pictured below is a metal rail with barbed fittings.
The Fuel reg outlet is marked red, it runs that metal tube to down under the middle of the manifold.
The two caps marked in black are blanked. In the case of the Rodeo (this manifold is off a Jackaroo) the top one thats capped is capped on the water/vacuume switch on the thermostat housing which is what the metal tube is connected too.
Here is the same end with the fuel regulator removed.

Circled in Yellow is where the hose for the VSV goes on.
Circled in Black is the capped fitting. Part of the reason for it is that Overseas the EFi motors were fitted with air pumps to further scrub the emissions.
This is the other end showing the inlet to the fuel rail.

Marked in purple is the fitting for the Brake booster.
Marked in Yellow is the VSV hose that goes to the canister. Next to it and not marked in any picture is the hose that goes to the charcoal canister.
Down in the bottom right you can see the fuel return tube marked in red.
I dont see any reason why the fuel flow couldnt be reversed, in at the front and out at the rear.
Heres the Throttle Body. Its a Piazza one, i dont have a pic of a Rodeo one.

I think that about covers it. If youve got any questions fire away and i will do my best.
Bob.