Mechanics

94 SI VACUUM ISSUES

1994 Honda Civic

Engine Performance problem
1994 Honda Civic 4 cyl Front Wheel Drive Manual 189000 miles

hi. My civic fail emissions because it fail pressure test. Need to know how to fix this. Guy said it might be the vacuum from the evap canister to the fuel tank but I dont see it under car not sure where else it can be ran. Any suggestions.
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Inotion
February 27, 2009.



Hi inotion,

We need to know the specifics of the failed emission test. What was the pressure test you mentioned and the results?

KHLow2008
Feb 28, 2009.
Ok well I live in arizona. Just bought the car so need it to pass smogg so I can finish the car

ok its a 1994 honda civic si 1.6L engine d16z6. Now the portion that fail was the equipment/presure inspection

they check the evaporative system that passed. They check the fuel cap that passed and then they did a pressure test and that failed. And at the bottom of the paper work it says this vehicle has failed the equipent inspection.

Now the guy has told me that it can be the vacuum that goes to the fuel tank. Looked at a haynes book doesnt say how to replace it. Does say to replace the o rings on the fuel tank side and thats it. Its 38 bucks everything u take it in. So if the line is actually damage it will fail again. But have no clue how to replace it dont see it under the vehicle I just see 3 lines going to the gas tank and 3 lines coming out of the bottom of the fire wall one goes to the fuel filter one goes to the evap and one curves around and goes to the fuel return.

Tiny
Inotion
Feb 28, 2009.
The hose from EVAP to rear fuel tank should be the vacumn hose you are worried about. I could not find any good or complete diagrams of the system to show you so I hope the following testing procedures is of help to you.

To replace the O ring you mentioned, you would need to remove the fuel tank.


http://www.2carpros.com/forum/automotive_pictures/192750_EVAP94Civic01_1.jpg



http://www.2carpros.com/forum/automotive_pictures/192750_EVAP94Civic02_1.jpg



http://www.2carpros.com/forum/automotive_pictures/192750_EVAP94Civic03_1.jpg



http://www.2carpros.com/forum/automotive_pictures/192750_EVAP94Civic04_1.jpg


KHLow2008
Feb 28, 2009.
Hi, im having the same issue w thee exact same car. I took it the rtoy house in Phoenix and did a smoke test to see if there were any leaks in the fuel system and I was told there were none. I just got back from the emissions place again after I tighten up the fuel pump boot that were loose and it still failed the pressure test butpassed everything else. Please help : )

Tiny
FrNkalvrz
May 19, 2012.