I'm just curious- about how many total feet of hard plastic vac line is there on a 1991 5.8? (I think it's 3/16" or maybe 1/8")

I want to replace it all. My truck is pushing the 25 year mark with 163k on the odometer, and testing with a vac gauge has revealed a few of them to be leaking. Not very bad, but still leaking, and I figure if I need to replace those, I might as well just do them all because the rest probably aren't far behind.

I have a pretty cool idea for a method to replace them and how to mark the new hose to keep everything straight. I'm happy to put together a "how-to" thread for this once I'm done.

Thanks for the info.

 

bump! bumpity! bump bump bump!!

 

BUMP!!!!!!

 

I kinda forgot I posted this... guess I'll have to measure it myself.

I just haven't had time to get this project done so I haven't been overly worried about the answer.

 

Okay, well, the answer to my original question is: just shy of 20 feet (about 19.5 ft, to be more precise.) At least, that's how many feet it took to replace the engine vac harness only. I didn't get vac lines for the brake booster, HVAC controls or other parts replaced.

I wish I had pics for you but unfortunately I do not. Instead of replacing it with new plastic line (which I never liked anyway), I opted for 5/32" rubber line. O'Reilly had it available in bulk for $0.83/foot. I bought a multi-pack of vac connectors for $8, so all said and done, total cost was less than $20!

Anyway, what I did was I pulled the entire harness off the engine, and one at a time I replaced the vac lines. I removed the original lines from the boots/connectors, and simply measured out new line by comparing it against the old. Then I used the new vac connectors and installed the new line.

I couldn't do it immediately b/c I didn't have my tape with me, but to mark the new lines I'm going to use color coding tape that electricians use.

All in all it was a pretty simple, straight forward job. One thing I will note for anybody that wants to do it: my original vac harness has a boot that connects the vac feed from the right side of the motor to the left. I didn't realize it until after the job was done, but there was no need to keep that boot- you can run one solid line if you want, instead of using extra connectors to hook line into both sides of the boot. Of course, that's with rubber lines as well- if you're going to use plastic, you'll want to keep it.

 

Replaced a few I broke with the rubber hose. Going to do the rest also, thanks for answering the question I had about the block they connect from one side to the other.