I have a cracked injector line on number eight of my 6.2.
I haven't been able to find a replacement.
Napa seems to think I could change all the injector lines to flexible injector lines. They say the lines are made for fuel injection and have a rating over 2000 lbs. Has anyone tried these? Am I remembering correctly, don't all the injector lines have to be the same exact length and diameter to get proper timing? Could these be lengthened to have enough room to remove the valve covers w/o removing the lines?
Hope that's not too many questions, thanks in advance.
GW

Are you talking, rubber, or braided steel? If so, I wouldn't use them. Just find some that are meant for it. Plus, doesn't the 6.2 IP push out over 18000 PSI? That isn't even close to 2000. Also, the length doesn't matter, but i would keep them all the same diameter.

i think the 6.2/6.5 ips are putting out around 2400 max....

They are supposed to be braided steel but I haven't seen them. Their other idea was to buy some steel line from them and bend them up. Then I started remembering where someone once said the original lines are double walled. That's when they started talking about the braided flexible lines. Seemed strange to me that such a simple solution exists and I hadn't heard of anyone using it. It's all kinda suspect to me. Sooo, I'm still looking for the correct injector line. If it takes much longer to find then I may experiment with some new fangled whizbang product.
Thanks, GW

Hm, maybe Kennedy (see http://www.kennedydiesel.com/) has them or can get you one, might be a good idea to call him or to send a PM.

The lines must be all of the same length; don't know for the diameter. Flexible lines can probably expand under pressure and thus screw up the timing.

How would you put the right fittings on a self-made line?

Those lines are pretty special. I wouldn't mess around with any kind of aftermarket line. If you look the lines are very carefully designed and very carefully supported by clamps and vibration dampeners.

New (or used) lines should be available on ebay, from a local junkyard, or from a GM dealer.

Incidentally, the injection pressures for the 6.2 are approximately 1500 psi, possibly a few hundred psi higher depending on the exact application and the condition of the IP and injectors.

Olee,
The expansion and timing problems are what worry me too.
I'll try Kennedy.
Junk yards out here are rare as the proverbial hens teeth and stocked worse than church during Superbowl.
The closest GM dealer just laughed and said they don't even manufacture them anymore.
Thanks, GW

Do the clamps make a difference? I still need to put them back on ...

Well i guess i was off with the PSI rating by just a little bit.:o: Why do the lines need to be the same length to keep timing? I would think that once they all were primed, length wouldn't matter.

i have an extra one i could get to you for a reasonable price - send me a PM if interested.
paul

Why do the lines need to be the same length to keep timing? I would think that once they all were primed, length wouldn't matter.


They probably expand some, even though they are metal lines; and the pulse from the IP doesn't go at infinite speed through the lines.

Hm, how fast might that be? Probably not faster than light speed ...

not sure if there supposed to be same length but air brake lines and hydrolic lines are supposed to be so that when activated all systems respond at the same time

How do they do that with air brake lines? There are trailers with the rear axle about 17 meters apart from the front axles of the truck, maybe even farther apart ... Change the trailer to another one of different length, or drive without one, and the brakes are messed up?

on the valve bodies that send air to the brakes, the lines to set are usually the same length so a group operate equally. when you have different sets of axles they usually have different valve bodies, and i'm not sure whats done. i know its most important on the tractor

The theory is that the IP forces fuel in, the pressure in the line causes the injector to pop and release the same amount of fuel. All things being equal (line construction/composition, etc.), I can't see why a SLIGHTLY longer or shorter line would make that big of a diff. BTW, Ebay always has a bunch of new replacements available.

did some reserch. air needs to be same length due to compresion. time of travel will be unequal due to different rates of compression. a proper hydrolic fluid doesn't compress, but lines expand. so the closer lines are in length, the less differrence in time to travel due to expansion,which also reduces the pressure, which opens injectors unequally . braided lines expand more than solid lines, so they will slightly lower your pressure to the injectors

Hm, how much is the pressure drop from opening an injector until it closes?