Vacuum line diagrams

Tiny
BETTYBADA
  • MEMBER
  • 1995 OLDSMOBILE 88
  • 130 MILES
Successfully replaced spark plugs and PCV valve but in the process broke a hard plastic line. It comes from a box right next to the maxi-fuse box. This box is on the driver's side. From this box, a flexible rubber vacuum line connects to the fuel rail directly above a fuel feed line. This is on the opposite side of the intake from the FPR. The hard plastic line that I broke crosses the fuse box, joins with the fuse wires through the firewall and into the passenger compartment. Line continues under the carpet along the passenger side of the vehicle, but I don't know for how far since I didn't pull up all the carpet. After running around the block to be sure the car would run, I smelled gas in the oil when I pulled the cap off. What is the name of this box/cover next to the fuse box, how can I replace this line, and is this the cause of the fuel in the oil? In this picture, the elbow with the yellow dot is connected to the vacuum hose that connects to the fuel rail. You can't see the flange where my broken line is attached because I broke that too.
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Monday, May 14th, 2012 AT 5:15 AM

6 Replies

Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
You can just find a piece of rubber vacuum hose to slip over where it is broken as those aremade to fit and i'm not sure if they are available. If it connects to the fpr then it's the trans line, but it shouldn't goinside the car. That wold be the accessory line for the hvac. The line may be the trans line. I'll send two diagrams along, one for hvac and the other for engine. If you have gas in oil it can be from short hops like less thatn 10 miles everyday or leaking intake gaskets, a fuel injector problem etc. If you drive less than 10 miles try to drive further or take it out once aweek for a drive about 30 mile on eway. I have no idea what the box is called other than a junction box.
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Monday, May 14th, 2012 AT 2:47 PM
Tiny
BETTYBADA
  • MEMBER
  • 3 POSTS
Thank you for responding but please read my question again. The flange where the hard plastic line is attached is broken. I could repair the line with rubber vacuum hose but there's nothing to connect to. The line is absolutely not the transmission line and it absolutely does run into the passenger cabin. The broken line does not connect to the fpr. It connects only to the junction box and an unspecified point inside or past the passenger cabin.

I doubt the fuel in oil problem is due to short hop driving. Spark plugs indicated normal wear without fuel or oil fouling and the fuel in oil problem coincides with changing of spark plugs, new pcv valve, and breaking of this unidentified line which clearly is related to the fuel system. The intact vacuum hose from this "junction box" connects to the fuel rail directly on top of a roughly 1 inch diameter rubber hose marked fuel. This is the opposite side of the fpr. That may be a tube for the brake booster. I need a name for the junction box to get a new one.
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Monday, May 14th, 2012 AT 6:49 PM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
I have no idea what they call it unless it's a heater part.
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Monday, May 14th, 2012 AT 7:12 PM
Tiny
BETTYBADA
  • MEMBER
  • 3 POSTS
For anyone else searching, the name of the box turns out to be a vacuum reservoir, sometimes called a vacuum tank. It's an HVAC controller, basically. Still trying to solve the mystery of fuel in oil.
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Wednesday, May 16th, 2012 AT 5:07 AM
Tiny
BRKISRL B. CAMERO
  • MEMBER
  • 1 POST
  • 1992 OLDSMOBILE 88
  • 3.8L
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 35,000 MILES
My car has several torn vacuum lines, and I haven't figure where to connect it, nor the majority of the mechanics I've asked for, so I need some kind of guide/diagram to solve it.
Some of the details I've figured out:

- Vacuum feed line to the vacuum control valve is torn
- Gas tank filler tube is damaged
-Vapor tube from the charcoal canister to the tank has fallen off.
The charcoal canister has split and is leaking
The vacuum control valve is not allowing vacuum to enter the fuel tank.

Thanks in advance
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Wednesday, December 30th, 2020 AT 11:37 AM (Merged)
Tiny
KASEKENNY
  • MECHANIC
  • 18,907 POSTS
Take a look at this diagram. It should give you the routing that you need. Let us know if you need other information and how you make out. Check out the diagrams (Below). Please let us know if you need anything else to get the problem fixed. Thanks
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Wednesday, December 30th, 2020 AT 11:37 AM (Merged)

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