Create A PCV Valve Bypass System


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{mosgoogle}This next picture represents the correct way in which to install the fuel filter, as it is a one-way design.  The filter sits toward the outlet side, marked on the housing by the words, "OUT" on that side.  The inlet side, away from the filter, is marked by the words, "IN" on the end of the filter housing.  The "IN" side should be connected to the hose coming out of the PCV Valve.  Blue arrow indicate the direction of flow.  See below:

Old & New PCV Valves

Next, examine the rubber hoses and make sure that they are not dry and cracked.  Also make sure that they are not shedding black stuff all over your hands while you are handling them.  Any of these problems indicates that it would be a good idea to go ahead and change them with the optional fuel filter hose purchase.

Next, decide which of the fuel filter vinyl connection will fit best inside of the 3/8" fuel hose.  Guess what, the ones marked 3/8” fit best.  Use a little motor oil to help seating and disconnecting the hose from the fittings.  As you can see from the picture below, the hose is a little beat, and needs to be replaced:

Fuel Filter Flow

Now it is time to make a decision.  Either you can use the two feet of fuel hose to replace the entire metal hose, or you can custom fit the fuel hose onto two parts of the metal hose ends.  If you choose the latter, then follow the next step.  I chose to keep some of the metal hose, as I don’t know what hind of temperatures are generated at the back at the engine bay.

For the 4.6L owners, here’s your part, as well as the 3.8L owners who are going to replace the entire metal hose with fuel hose.  On the 4.6L engine there is a length of hose that is wrapped in heat protection, do NOT cut this section of hose for this part of the procedure.  For the 3.8L owners, take your two-foot section of fuel hose and connect one end back up to the manifold.  Connect the other end back up to the PCV Valve and insert it back into the valve cover.  You want to make sure the path that the hose take will allow for enough room to clear all the hoses and wires, as well as give you a good spot to “mount” the fuel filter for easy viewing.  The hose should take a nice path well above the manifold, and be toward the back near the firewall.  This is where the 3.8L owners will "mount" the fuel filter.

Categories: Mustang Tech

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