Front Fuel Leak 1993 Ranger 4.0 XLT Auto

[Angry Possum]

There is a fuel pump fuse. It should be in the fuse/relay box in the engine compartment where the relay is. Usually, the best way to depressurize the system is to remove that fuse or relay. Then try to start the engine so it burns the remaining fuel without the pump running. There should also be a schrader valve somewhere on the fuel rails as a pressure test port. You could push the needle in that valve to relieve pressure. But that is sometimes messy if there is pressure in the system. With your leak, I doubt there is much pressure there, if any at all.

Should be the fuse I'm pointing at.
View attachment 142255

Thanks, is it possible that there are two fuse panels inside the Ranger. One is definitely under the steering wheel area where I located it. I don't know if I saw one by the passenger side area.

 

[Curious Hound]

Thanks, are there two fuse panels inside the Ranger. One is definitely under the steering wheel area where I located it. I don't know if I saw one by the passenger side area.

Only one in the cab and one in the engine bay, unless you or a previous owner added an extra.

 

[Angry Possum]

There is a fuel pump fuse. It should be in the fuse/relay box in the engine compartment where the relay is. Usually, the best way to depressurize the system is to remove that fuse or relay. Then try to start the engine so it burns the remaining fuel without the pump running. There should also be a schrader valve somewhere on the fuel rails as a pressure test port. You could push the needle in that valve to relieve pressure. But that is sometimes messy if there is pressure in the system. With your leak, I doubt there is much pressure there, if any at all.

Should be the fuse I'm pointing at.
View attachment 142255

Thanks for that, I'll check under the hood tomorrow. Started getting dark here in the east coast.

 

[Angry Possum]

@Curious Hound @lil_Blue_Ford can you show me which lines I'm removing from the fuel rail by using the photo I uploaded.

 

[Angry Possum]

@Curious Hound @lil_Blue_Ford Would it be these two connections circled in yellow? I know it's obvious, I just want to be 100%. Thanks

 

[lil_Blue_Ford]

@Curious Hound @lil_Blue_Ford Would it be these two connections circled in yellow? I know it's obvious, I just want to be 100%. Thanks

View attachment 142263

Yes, those are the two connections. You need to be mindful of where they go because one line is the supply and one is the return. I’d work one line at a time or make yourself a cheat sheet, I don’t remember offhand which is which, but the supply will connect to the fuel filter and one of the fittings on the pump. The return will be a straight shot all the way back to one of the fittings on the pump.

 

[Curious Hound]

Yeah. What he ^^^^ said. I've never disassembled a 4.0l before. That fuel rail looks diffetent from the 3.9l and 5.0l. But those 2 points are where I would have put the circles.

 

[Angry Possum]

Also should I put a gasket sealer or glue etc on the new intake gasket for the plenum. I really don't want any issues putting it back on.

 

[Curious Hound]

Also should I put a gasket sealer or glue etc on the new intake gasket for the plenum. I really don't want any issues putting it back on.

Shouldn't need it u less it comes with instructions that recommend it. In this case, that is a low pressure connecrion. Ensure that the surfaces are clean, dry and flat.

 

[lil_Blue_Ford]

Also should I put a gasket sealer or glue etc on the new intake gasket for the plenum. I really don't want any issues putting it back on.

No gasket sealer or anything, those gaskets are supposed to go in dry. I will put sealer on valve cover gaskets because they tend to leak. But not upper intake gaskets.

 

[Angry Possum]

Should I clean out the plenum intake it's really gunked out, or just leave it be?

 

[Curious Hound]

Also should I clean out the plenum intake it's really dirty.

View attachment 142265

Wouldn't hurt. Some carb=throttle body cleaner should work or brake cleaner or maybe even kerosene. Might as well clean the throttlebody and IAC valve with carb/throttlebody cleaner also. Then lube the pivot points and moving parts of the throttle linkage.

 

[Angry Possum]

Question, @Curious Hound @lil_Blue_Ford Is this fuel line fitting by the fuel rail a spring loaded connector or is it threaded. It looks it would be threaded to me?. It's located bottom left from photo circled in yellow.

 

[Curious Hound]

That's threaded. Should be able to spin the top hex-shaped nut. The center part shouldn't turn.

 

[lil_Blue_Ford]

That's threaded. Should be able to spin the top hex-shaped nut. The center part shouldn't turn.

This.

I’ll also add that what that line is connected to is the fuel pressure regulator