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» Northern California Ford Owners     » Automotive   » Tech Talk   » EVAP System Leak

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Author Topic: EVAP System Leak
joeca12
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Failed smog today because of and EVAP System FAIL. The tech said the leak is in the line between the canister and the gas tank. Can I replace? If so any eas way. Do I have to drop the gas tank. I have heard of smoke tests. If I find the leak how to I repair? CLAMP? I would rather just run a new line but now sure. Look in the manual and can't find the path. Also my check engine light never comes on I was failed on that too since it should come on when I turn the key. Bulb replacement.
Thanks.
89 5.0 GT

Posts: 28 | From: Brentwood | Registered: Feb 2012  |  :
joeca12
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Anyone? Researched online a bit but no luck. No one has replaced this line. My fuel cap test passed. The test from the tank to canister did'nt. Little help here.
Posts: 28 | From: Brentwood | Registered: Feb 2012  |  :
Blind
2.3L
CAFords OG
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take a look at the canister in the engine bay, most likely the leak is right where the hose plugs into the canister because there's a 90* bend right there, can probably get away with just wrapping the split in the hose with electrical tape.

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89 GT Hatchback 5.0/T5
89 LX Notchback ex 4cyl, 14psi
02 Harley F150, 15psi
14 Scooby FXT Touring, 17psi

Posts: 8489 | From: (Socal) Camarillo | Registered: Jul 2003  |  :
Duncan Motors
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or your gas tank filler neck seal. those are always cracked. if that still doesnt help, i have a special tool that will find any leak on your car for your evap for 50 bucks.
Posts: 6310 | From: Vallejo | Registered: Sep 2006  |  :
93 twintrbo
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The smog tech should of pinched the Evap hose at the charcol canister ( before the purge flow solenoid). He found the leak when doing the evap test. Having said that, Your leak is most likely the Fuel tank filler neck. The best thing is to take the car to a shop that has a smoke machine and let them "smoke" the fuel system to find the source. You can replace hose after hose and never know if you acually fixed the problem untill you go and get it smogged.

Lawrence

Posts: 42 | From: Nor Cal | Registered: Nov 2010  |  :
BAD ASS 5.HO
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check the peice of hose on the passenger side under body were the plastic hose meets the metal one. they are connected with a small rubber hose. make sure that hose is not cracked, broken or missing.

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98 boosted/stroked cobra
98 rio red cobra

Posts: 990 | From: modesto | Registered: May 2011  |  :
BAD ASS 5.HO
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check the peice of hose on the passenger side under body were the plastic hose meets the metal one. they are connected with a small rubber hose. make sure that hose is not cracked, broken or missing.

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98 boosted/stroked cobra
98 rio red cobra

Posts: 990 | From: modesto | Registered: May 2011  |  :
bentley mobs a stang
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quote:
Originally posted by 93 twintrbo:
The smog tech should of pinched the Evap hose at the charcol canister ( before the purge flow solenoid). He found the leak when doing the evap test. Having said that, Your leak is most likely the Fuel tank filler neck. The best thing is to take the car to a shop that has a smoke machine and let them "smoke" the fuel system to find the source. You can replace hose after hose and never know if you acually fixed the problem untill you go and get it smogged.

Lawrence

This.


Exactly what I wrote in ur other thread. Don't try and reinvent the wheel. Avoid time and headaches and diagnose it right.

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We're here for a good time, not a long time.

Posts: 528 | From: East Bay | Registered: Jul 2011  |  :
joeca12
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Thanks for the replies. Its going to cost $95 to do a somoke test. I feel like I could replace all the hoses or fuel neck filler neck gasket for much less. Also if my filler neck was bad would'nt I fail the gas cap pressure test, which passed.
Posts: 28 | From: Brentwood | Registered: Feb 2012  |  :
norcalfiddy
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quote:
Originally posted by joeca12:
Thanks for the replies. Its going to cost $95 to do a somoke test. I feel like I could replace all the hoses or fuel neck filler neck gasket for much less. Also if my filler neck was bad would'nt I fail the gas cap pressure test, which passed.

they test you gas cap, and the fuel tank.

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600HP 1996 7.3L powerstroke single cab short bed race truck

Posts: 3393 | From: Brentwood | Registered: Aug 2011  |  :
Blind
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quote:
Originally posted by joeca12:
Thanks for the replies. Its going to cost $95 to do a somoke test. I feel like I could replace all the hoses or fuel neck filler neck gasket for much less. Also if my filler neck was bad would'nt I fail the gas cap pressure test, which passed.

During a smog test the gas gap is removed from the car, and tested on a separate machine, while that is off they pinch the evap hose in the engine bay and insert a pressure tester in the filler hole and pressure test the gas tank / evap system.

they are 2 completely different things being tested.

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89 GT Hatchback 5.0/T5
89 LX Notchback ex 4cyl, 14psi
02 Harley F150, 15psi
14 Scooby FXT Touring, 17psi

Posts: 8489 | From: (Socal) Camarillo | Registered: Jul 2003  |  :
S550_notch
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I'd check th gas lines from the tank one goes to the filter the other one I forgot but I failed smog a while back cause it was touching my exhaust and it melted through the line

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86 notch coyote swapped

Posts: 2674 | From: 650-408 | Registered: Jul 2011  |  :
bentley mobs a stang
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Spend the money and smoke test it. Or take it to LMC and let the students do it for free or close to free. What if u replace the filler neck, the lines, and the o ring gasket for the pump, and after all that u find out u have a small crack in the top of the tank? ur gunna be fuckin pissed lol. Best to diagnose it instead of throwing parts at it. That's my $.02

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We're here for a good time, not a long time.

Posts: 528 | From: East Bay | Registered: Jul 2011  |  :
norcalfiddy
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yea, i also have most of the lines from my 89lx. you can get the ones you need and we can work something out. mine passed perfectly fine. i already sold the filler neck grommet tho.

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600HP 1996 7.3L powerstroke single cab short bed race truck

Posts: 3393 | From: Brentwood | Registered: Aug 2011  |  :
joeca12
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The only place I can find that does smoke is brentwoos muffler and the want $95. My cheap as$ doesn't want to pay that. Plus the secretary seemed slow. Anyway just venting.
Posts: 28 | From: Brentwood | Registered: Feb 2012  |  :
bentley mobs a stang
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Call LMC bro! The worst they will say is no, but I doubt they will. Community colleges like taking in customer cars to give students exposure to real life repairs, because it doesn't cost the college anything. They are insured in case anything happens to ur car, and u have nothing to lose but everything to gain from it.

Ps 95 bucks is nothing. My shop charges like 120 for diagnostic

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We're here for a good time, not a long time.

Posts: 528 | From: East Bay | Registered: Jul 2011  |  :
joeca12
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It ending up being the vent valve gasket. Had to drop the tank but was not as bad as I thought. System passed. Thanks.
Posts: 28 | From: Brentwood | Registered: Feb 2012  |  :
Duncan Motors
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i had and mentioned that smoke test machine for 50 instead of the 95 u found.if u read thru your list of help. but regardless glad u found it.
Posts: 6310 | From: Vallejo | Registered: Sep 2006  |  :
joeca12
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Yeah never did a smoke test just took some advice from another member, but thanks.
Posts: 28 | From: Brentwood | Registered: Feb 2012  |  :
fredfifty
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Great (old) thread. I failed the evap part as well. Going to check the filler neck area.

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RIP EDSON VELORO
IM A NOOB, EXCUSE ME. THANKS.
92 LX Coupe 5.0 CARB'd BOLT-ONS SMOG LEGAL

Posts: 4768 | Registered: Sep 2010  |  :
fredfifty
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.

[ 2018-12-04, 11:00 AM: Message edited by: fredfifty ]

--------------------
RIP EDSON VELORO
IM A NOOB, EXCUSE ME. THANKS.
92 LX Coupe 5.0 CARB'd BOLT-ONS SMOG LEGAL

Posts: 4768 | Registered: Sep 2010  |  :


 
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