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11-06-2007, 08:05 PM
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#1 |
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Registered User
Join Date: Aug 2007
Location: San Diego, CA
Posts: 9
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Need help identifying loose vacuum/fuel lines
I'm 70% done with a project K5. I bought the truck in very bad condition and many modifications had been made, some poorly done.
I have worked through most things. I currently have two unattached lines under the truck and I cannot find enough good data in my Haynes or Chilton books to determine what they are and where they are supposed to go. One comes out of the top of the transfer case. I don't think it is a simple breather tube because it is not filtered or anything. The first attached picture is of the hose. Can someone tell me where it is supposed to connect? The other is an unconnected steel tube that runs near the fuel line heading back to the tank. It ends, unconnected, just to the right (passenger side) of the transmission. (see 2d attached pic). I traced the tube back to the rear, behind th gas tank where it crosses along the frame cross member to the drivers side and ends at a strange three fitting connection to the rear of the gas tank filling neck. (see 3rd attached picture). I have no clue what the three fitting *device* is and have no clue what to connect the other end to. Ideas? Thanks!! --Jeff |
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11-06-2007, 08:52 PM
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#2 |
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Registered User
Join Date: Mar 2006
Location: USA
Posts: 21,019
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Re: Need help identifying loose vacuum/fuel lines
The one on the top of the transfer case is a breather.
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11-06-2007, 09:11 PM
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#3 |
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Senior Member
 
Join Date: May 2006
Location: Philadelphia, Pa. 19454
Posts: 9,761
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Re: Need help identifying loose vacuum/fuel lines
The one on the pass. side used to run all the way forward to the charcoal canister. Still not sure what that cylinder device does by the fuel filler neck, but I'm sure someone else will know...
Welcome to the boards from Philly, Pa..... J. Post up some pics. of your truck pls., We would like to see it
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Semper Fi...Uncle Sam, you da man All parts offered to help are free, unless otherwise noted Dont try this stuff in my build thread, unless you have 55 years of mechanical OTJ training SAFETY FIRST AS usual, off topic They say your mind goes second, can't remember the first Jim Last edited by jaros44sr; 11-06-2007 at 09:12 PM. |
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11-06-2007, 11:35 PM
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#4 |
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Registered User
Join Date: Aug 2007
Location: San Diego, CA
Posts: 9
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Re: Need help identifying loose vacuum/fuel lines
Here are a few pics. Not quite done. Needs new shocks, brake overhaul + new master cyl/vac assist and I'm getting the entire tub spraylined with polyurea.
Has new GM Performance 350 HO (330HP, 380lb-ft) crate engine and new/complete Painless wire harness. Body was sanded down, repaired and painted desert tan. All new body bushings. Transmission (4WD) is stable. Has a B&M shifter. I have not taken the time to identify the transmission and transfer case. Automatic, either a TH350 or TH400. So much has been done to this truck since '72 I cannot assume anything. |
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11-06-2007, 11:37 PM
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#5 |
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Registered User
Join Date: Aug 2007
Location: San Diego, CA
Posts: 9
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Re: Need help identifying loose vacuum/fuel lines
by the way... Semper Fi and happy early 232.
They wouldn't let me take my HMMMV with me so I had to build a Blazer. How else am I going to get my guns to the desert? |
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11-07-2007, 05:20 AM
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#6 |
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Senior Member
Join Date: May 2006
Location: Philadelphia, Pa. 19454
Posts: 9,761
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Re: Need help identifying loose vacuum/fuel lines
Nice work sarge, tan looks really good not alot of that around. Did you do the work yourself? How much rust.
That cylinder with the three lines going to it must be a vapor canister Nice and clean Same back at ya
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Semper Fi...Uncle Sam, you da man All parts offered to help are free, unless otherwise noted Dont try this stuff in my build thread, unless you have 55 years of mechanical OTJ training SAFETY FIRST AS usual, off topic They say your mind goes second, can't remember the first Jim Last edited by jaros44sr; 11-07-2007 at 05:22 AM. |
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11-07-2007, 08:44 AM
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#7 |
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Senior Member
Join Date: Jun 2001
Location: Shelbyville, KY
Posts: 3,261
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Re: Need help identifying loose vacuum/fuel lines
In 72 the polution controls fairy attacked the truck industry with a vengence. The line next to the fuel when to the charcoal canister that was mounted under the leading edge of the pass fender. It take too long to try to explain all the lines and where they go but---all your really need to run is a fuel filler and large vent line coming out of the fuel tank as well as the feed running forward to you fuel pump. The other lines coming out of the tank can be capped unless Calif inspects this crap.
Up front, you can eliminate the charcoal canister with it's lines and just run like a 67-70 setup. On the vent line out the top of the transfer--it should have a venting cap on the hose to minimize water & dirt penetration. Check your rear axle--should have same vent line on it. Huck |
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11-07-2007, 10:05 AM
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#8 |
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Post Whore
Join Date: Feb 2000
Location: Rose Hill, KS, USA
Posts: 12,686
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Re: Need help identifying loose vacuum/fuel lines
Welcome to the board - great looking K5!
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1970 Blazer with a 400 sbc and 4" lift 1980 Pontiac Trans Am, 455 Oldsmobile 2012 Kawasaki Concours 14 |
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11-07-2007, 10:31 AM
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#9 |
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Senior Member
Join Date: May 2006
Location: Philadelphia, Pa. 19454
Posts: 9,761
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Re: Need help identifying loose vacuum/fuel lines
Could post up some closer pics of the trans fer case vent, mine doesn't have one.
 Don't know if you can see it, but it has a 8" piece of rubber hose on it, and bends into a 'U' away from the frame I'll try to get better pics.
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Semper Fi...Uncle Sam, you da man All parts offered to help are free, unless otherwise noted Dont try this stuff in my build thread, unless you have 55 years of mechanical OTJ training SAFETY FIRST AS usual, off topic They say your mind goes second, can't remember the first Jim Last edited by jaros44sr; 11-07-2007 at 10:34 AM. |
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11-07-2007, 11:02 AM
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#10 |
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Registered User
Join Date: Aug 2007
Location: San Diego, CA
Posts: 9
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Re: Need help identifying loose vacuum/fuel lines
Last night I hopped on the creeper and went on a mission to ID the trans and xfer case. I have a TH350 and an NP205.
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11-07-2007, 11:16 AM
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#11 |
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Registered User
Join Date: Aug 2007
Location: San Diego, CA
Posts: 9
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Re: Need help identifying loose vacuum/fuel lines
Huck...
Everything original in the engine compartment was replaced. None of the emissions stuff made it back in. In CA, 1972 is now exempt. The fuel system currently goes like this. Intake: Tank->Mech Fuel Pump->Fuel Filter->Carb Exhaust: Exhaust Manifold->Muffler->Atmosphere For safety and reliability I'd like to remove / cap off everything not necessary. Is it advisable to cap everything coming off of the fuel tank except for the fuel line heading forward to the fuel pump? |
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11-08-2007, 07:53 AM
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#12 |
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Registered User
Join Date: May 2000
Location: Petrolia,Ontario,Canada but working in Port Huron,Mi.
Posts: 1,772
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Re: Need help identifying loose vacuum/fuel lines
The hard line on the frame most-likely goes to the vapour canister that should be mounted on the pass front fender,beside the battery.
So you can trace that line back to the vent tube(beside filler tube). One should go to a vent line on top of the tank,don't mess with that one unless you like being showered with gas on fill-ups and whenever you open the gas cap. the 3rd....hmmm...I'll have to research that.I did at one time but it's left my head now.
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71 blazer,350SBC,approx.375HP,700R4,factory GM TPI.Dual electric fans,33x12.5x15 ATR on stock suspension. Petrolia,Ontario,Canada but working in Port Huron,MI. See ALL my Blazer pic's HERE |
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