I need help reconnecting some vacuum lines! 4.0 ohh 1991 4x4 ranger. I have pictured three lines that I found open on my engine bay.

I just bought the truck. The previous owner said the 4x4 isn't working (but the transfer case will engage, must be an issue with hubs not locking?) and the oil smells heavily of fuel. This may tip off where these lines need to go?

I have pictured the lines that I need to hook up. The first picture I am holding the line that is coming off of the air box. The second and third photo are of two open lines that are wrapped in the same harness. I am holding the harness and have a pic showing where they are coming from.

Can someone please post a photo of where these lines go on a ohh 4.0? Can someone also say where the vacuum lines are for fuel and hubs?

I would pay someone to send me a video of vacuum lines on the ohh 4.0.

 

The vacuum setup on the air filter is for the Air Pre-heater, if you look at the large tube coming out of lower air filter box that runs to the rad support, i.e the fresh air intake, you will see the air diverter valve, with vacuum hose attached, that hose should run to the device on the air cleaner box
The other hose on that device should run to a vacuum source

The double hose in the second and third picture may be the source of the air cleaner device, but wait..................
There are two fuel lines that come in from drivers side frame rail
One will connect to fuel rail just below vacuum manifold, seen in 3rd picture
The OTHER hose runs to the Fuel Pressure Regulator(FPR), you need to find the FPR

Look behind and below alternator
On the lower intake
Look for that OTHER fuel ine
Once you see the FPR you will see it has a Vacuum port facing back towards firewall, thats were I think one of the dual lines plugs in
If so then the other vacuum line may be for the air cleaner

Normally that dual line should run behind the upper intake then down and to the front under the coil pack to the FPR


1991 didn't have vacuum hubs, that was only 1998-2000
Front axle is OPEN type, which means if either hub is not LOCKED to its axle then no 4WD
Not many parts around to fix the old Auto hubs

This is a auto to manual conversion how0to, but it has pictures so you can see whats inside and it any thing is broke when you dive in: https://therangerstation.com/tech_li..._hubswap.shtml

 

Was anyone ever able to share a diagram of the vacuum hoses and where they go for the 1990 4.0 ohv ranger? I’ve been trying to get it all where is supposed to go before I start having problems.