I was examining my engine yesterday, just making sure things were copacetic and notice fuel around the rail. Under closer inspection, I found that all the high pressure ( solid lines ) were somewhat loose. All of them !

I went through tightening and found that most if not all needed a good 1/4 to 1/2 turn on them.

Like with the rail to injector lines, there's no torque specs for these lines but, they're like AN fittings to where as long as they're snug they won't leak.

As a preventative measure, it's a good idea for everyone to check these lines every once in a while. If left loose too long, they can crack, the head on them can become deformed and not seal right and/or, you could end up with running issues because of air being drawn in.

 

Thanks for the heads up

 

Well if you would put some muscle into it, it probably wouldn't be a problem....

 

That has nothing to do with it. They were on tight. Obviously they can come loose over time. Tighten them too much and they're guaranteed to leak as you will deform the ends just like the connector tubes

btw... you're welcome for getting some info that might prevent you from having some grief.

 

He's just hasseling you, take it easy airdale. And your right overtightening those suckers is a great way to buy new ones.

 

Thanks for the heads-up. I am going to check them when I run the valves again this weekend.

Some guys here dont run their engines long enough to develop a leak. Trailer queens




J/K

 

Geez!!!! What size of the bed did you get kicked out of this morning?!

I was just playing around.

 

If I'd get mine running this could be the case.

 

Actually, there is a spec. They get tightened to 22 ft lbs or 30 Nm as per the FSM

 

My torque wrench read exactly "Gist tight enuff" and then a little. Jay

 

I usually go by the 1/4 turn before it breaks rule. LOL

 

Ford service manual... dude, you're on the wrong page ! LOL

I never saw that in the service manual. I'm talking about the hard high psi lines. There's specs for everything else but, not for these lines that I've found.

 

Ok, I found it and you're right. It's only showing the lines to the tubes though but does say in writing... " all HP lines"

I'm like you though.... tighten to just before it breaks.

 

your absolutely right. It is hidden in a different section towards the beginning of the section for the 5.9s. I have no idea why they would not include it in the section where they show the installation of the injectors and the plumbing. All the other tq specs are in the installation instructions, but those.

 

How exactly do you get a torque wrench onto a nut with a fuel line anyway? Use the "just tight enough method". I did have a line come loose at injector #6 at the head and lost about 30 gallons of fuel in a matter of 50 miles. Was spraying onto and being absorbed by the firewall insulation and then dripping onto ground. But I checked the others and found a few more that took a little turn to get them snug. And it took 90k miles to come loose as I had never touched them before. Everything was still stock. There is also a line that connects straight into the back of the head that is a real treat to try and get to, if you need a good laugh at yourself get a wrench on there and snug it up! My girlfriend thought I was trying to have sex with my truck with the grunting and my position.