SID "Tighten Fuel Cap" I replaced cap and still comes on! - SaabCentral Forums
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  #1  
Old 7th September 2010
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Default SID "Tighten Fuel Cap" I replaced cap and still comes on!

A week ago my SID informed me to tighten the fuel cap. So I pull over and tighten the cap. About ten minutes later it came on again. My cap was original and I have about 145,000 miles on my Saab so I decided this justifies a replacement. Replaced the cap and the SID still tells me to tighten fuel cap.

After a few times ignoring the warning my CEL (check engine light) came on. I checked the CEL codes and came up with a "P0455" or a evaporation emissions large leak. What could this be? This is one area I lack knowledge in. I have replaced my fuel pump assembly and filter about 6k ago for preventive maintenance.

Thanks guys!
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  #2  
Old 7th September 2010
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I just replaced the purge valve about 200 miles ago too. And the cap I purchased was from NAPA.
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Old 7th September 2010
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On the passenger side shock tower, under the hood, right by the belt tensioner, is a small valve.

This is the purge valve.

One of the hoses from it runs over to the throttle body.

On my car the hose was long enough to make contact with the tensioner roller and wore a hole in the hose.

I kept getting the "check fuel filler cap" warning until I replaced the hose.

Take a look at the hoses on this valve and you may find your problem.

It can be cleaned.

REM from Seattle writes:

The Purge Valve is located on the passenger side strut tower. It is held on by a rubber ring that attaches to the strut brace. There are two vacuum hoses and an electrical connector attached to the Purge Valve. You need to carefully pry up the wire retaining bail to release the electrical connector. be sure you note the airflow direction and mark which hoses go where to facilitate reassmbly.

I used WD40 and sprayed it in both of the Purge Valve hose connections. I let it sit for maybe 10 minutes, shook any remaining WD40 from the valve and and then repeated the procedure. After draining the Purge Valve the second time, I reinstalled the valve and the vale work fine for several months. Eventually it statred clicking loudly again, so I just replaced it.

Last edited by 99_9-3Mike; 7th September 2010 at 11:03 PM.
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Old 8th September 2010
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I read in another Saab forum not to use any other gas cap other than OEM. I'm going to take back the NAPA gas cap I bought and buy an OEM one. I checked my purge lines for holes and could not find any. Will check the lower hose against the fire wall when I have more time.
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Old 8th September 2010
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I doubt if anything was ever wrong with the original cap..
There is a ton of stuff to check.
Was the fuel tank ever "dropped" ?
If so, expect problems.
I miss the old caps, only a doller or so, one company in America may have stamped out hundreds of millions of these...for worldwide consumption.
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Old 8th September 2010
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"Tighten Fuel Cap" is the precursor to the dreaded small evap leak CEL p0442.

Here is an interesting discussion;

http://repairpal.com/OBD-II-Code-P0442

I get the "Tighten Fuel Cap" every once in a while eventually followed by p0442. From what I've read, fixing this is a real nightmare. Someday I hope all my other issues are resolved and I will go after this one.
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Old 8th September 2010
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Get an oem gas cap on there and that should resolve your issue considering you just got a new purge valve
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Old 9th September 2010
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Just bought a new OEM gas cap from the dealer and the "Tighten Fuel Cap" came on again. I just went through emissions today too and passed.

Any other ideas?
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  #9  
Old 9th September 2010
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Quote:
Originally Posted by earthworm View Post
I doubt if anything was ever wrong with the original cap..
There is a ton of stuff to check.
Was the fuel tank ever "dropped" ?
If so, expect problems.
I miss the old caps, only a doller or so, one company in America may have stamped out hundreds of millions of these...for worldwide consumption.
Yes my fuel tank was dropped to replace the entire fuel pump assembly. My Saab mechanic did this for me. He has been working on these cars for 38 years. Is there a seal that may be leaking?
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