Smog help!!! - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

240trooper · 01-19-2012, 10:16 PM

So I have failed smog twice due to the fuel evaporative control functional test failing. I've read a couple of threads and found that the test consists of testing the pressure between the gas tank and purge line to the charcoal cannister. I don't know much about the evap system but I wanted to know if the o ring that sits on top of the gas tank between the tank and the top that holds the fuel pump could be the culprit? A few months back my 255 lb pump went out and I replaced it with a brand new stock pump, I'm thinking maybe the o ring didn't sit right and that could be the problem? By the way I drive a stock 91 hatch ka24de. Im going to check it tomorrow but if that isn't the problem does anyone know what it could be? Thank you.

rcdad123 · 01-20-2012, 12:58 AM

it`s worth a try.

Tokona-x · 01-20-2012, 09:54 AM

That O ring could most definitely be a problem I would check there first and if its not that I would then go to a shop and have a smoke test done its the quickest way to find your problem and that way you wont be just shooting at it in the dark heres a vid check it out

Auto Repair Tip Wilmington Delaware - Fuel Tank Vapor Leak 1995 Mitsubishi Galant - YouTube

240trooper · 01-20-2012, 08:48 PM

Thanks. I didn't have time to check the o ring but I will def. get that smoke test done. Thanks.

rcdad123 · 01-20-2012, 09:16 PM

yeah, that smoke detector method is the shit. no more guessing.

01-19-2012, 10:16 PM	#1
240trooper Zilvia Addict Join Date: Sep 2003 Location: Torrance, California Posts: 791 Trader Rating: (10) Feedback Score: 10 reviews	Smog help!!! So I have failed smog twice due to the fuel evaporative control functional test failing. I've read a couple of threads and found that the test consists of testing the pressure between the gas tank and purge line to the charcoal cannister. I don't know much about the evap system but I wanted to know if the o ring that sits on top of the gas tank between the tank and the top that holds the fuel pump could be the culprit? A few months back my 255 lb pump went out and I replaced it with a brand new stock pump, I'm thinking maybe the o ring didn't sit right and that could be the problem? By the way I drive a stock 91 hatch ka24de. Im going to check it tomorrow but if that isn't the problem does anyone know what it could be? Thank you. __________________ 2.7L

01-20-2012, 09:54 AM	#3
Tokona-x Zilvia FREAK! Join Date: Nov 2008 Location: 909 Posts: 1,298 Trader Rating: (140) Feedback Score: 140 reviews	That O ring could most definitely be a problem I would check there first and if its not that I would then go to a shop and have a smoke test done its the quickest way to find your problem and that way you wont be just shooting at it in the dark heres a vid check it out Auto Repair Tip Wilmington Delaware - Fuel Tank Vapor Leak 1995 Mitsubishi Galant - YouTube __________________ I have five speed bolts if you need any Custom 2+2 E brake Cable brackets sold here!!!!! Last edited by Tokona-x; 01-20-2012 at 07:09 PM..

01-20-2012, 08:48 PM	#4
240trooper Zilvia Addict Join Date: Sep 2003 Location: Torrance, California Posts: 791 Trader Rating: (10) Feedback Score: 10 reviews	Thanks. I didn't have time to check the o ring but I will def. get that smoke test done. Thanks. __________________ 2.7L

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01-20-2012, 12:58 AM	#2
rcdad123 Zilvia Addict Join Date: Jul 2011 Location: san diego Posts: 639 Trader Rating: (0) Feedback Score: 0 reviews	it`s worth a try.

01-20-2012, 09:16 PM	#5
rcdad123 Zilvia Addict Join Date: Jul 2011 Location: san diego Posts: 639 Trader Rating: (0) Feedback Score: 0 reviews	yeah, that smoke detector method is the shit. no more guessing.