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  • awood
    replied
    Re: Gas Smell

    Glad you got it fixed...Maybe I need a lockout valve too, since mine is hard starting!!

    Leave a comment:


  • Philster
    replied
    Re: Gas Smell

    Great news. I called my local Chevy dealer and they ordered me a low pressure lockout valve and I put it on in about 30 min. It cost around $110.00 but the gas smell is GONE and what is better, the car starts immediately. No more cranking and waiting. Thanks for all the great info. This car is not only paying for itself in savings, but last month it put around $80.00 back into my pocket.

    Philster

    Leave a comment:


  • awood
    replied
    Re: Gas Smell

    All the above info is good and accurate as far as I know. Permit me to share my experience with my 2000 Cav... I had a smell that was very strong coming from under the hood. I could smell it while driving as well. It was more pronounced when my face was just over the small vent holes for the low pressure regulator. After reading here on the forum, I tried some leak detector solution (soapy water) over the vent, and there were many bubbles, indicating a leak. After replacing the diaphragm in the regulator (rebuild kit), I now had no leak at the vent on the LPR, but I could still smell the gas while driving. Then one day when refilling the tank, I heard a very loud pop from under the trunk area, followed by a loud rush of "air" (CNG). It seems like I had a dual problem with both the LPR and the HPR (High Pressure Regulator). The HPR must have been leaking as well, since the smell went away after replacement.

    Bottom line...if someone has a sniffer, that would likely solve a lot of guesswork. If you don't want to go that route, just follow a process of elimination. You may be able to find some commercial leak detector solution that will indicate a leak better than soapy water. Keep your mind open. It could be just about anything. I had a smell inside, even though the HPR is in the back of the car, just above the muffler.

    Leave a comment:


  • Lancer Automotive Group
    replied
    Re: Gas Smell

    We carry Advanced Fuel Components parts, they have a lock off that may work. If your in the area stop by and one of out techs can take a look.

    Leave a comment:


  • Philster
    replied
    Re: Gas Smell

    Does anyone know where I can buy CNG parts. If I need a low pressure lockout valve, I don't know where I can buy one. Please let me know if there are good online resources.

    Thanks

    Leave a comment:


  • Lancer Automotive Group
    replied
    Re: Gas Smell

    3687 South 300 West
    Salt Lake City UT 84115
    801-268-8863
    http://www.lancerautoand4x4.com/

    Leave a comment:


  • Philster
    replied
    Re: Gas Smell

    Originally posted by Lancer Automotive Group View Post
    If you want to bring it by our shop we can use our sniffer to see if we can find a leak (no charge for the sniffer). Just give us a call.
    Where are you located?

    Leave a comment:


  • Lancer Automotive Group
    replied
    Re: Gas Smell

    If you want to bring it by our shop we can use our sniffer to see if we can find a leak (no charge for the sniffer). Just give us a call.

    Leave a comment:


  • kirkbenge
    replied
    Re: Gas Smell

    It sounds like it's probably fairly normal. I get a small whiff of gas about 30% or 40% of the time when i park my car in the garage, if the timing is right. It seems to be that If I park in my garage for the night, I can never smell anything in the morning, but if I park in the garage and then go to get in the car an hour or two later, I can smell a whiff of gas about 1/3 of the time. This seems to be coming from my air filter, as what's left in the line bleeds out. It certainly isn't very strong, as I usually only catch a whiff, and I would need to sniff around the car to smell it again.

    Just remember that your nose is VERY sensitive to mercaptan (the chemical that gets added to NG to give it that smell). The human nose can detect methyl mercaptan at concentrations as low as 0.002 ppm! That is WELL below a dangerous level. If you are dealing with a significant leak, or a dangerous level of gas it will typically smell very strong. If what you are smelling is an "occasional whiff" and no leaks are detected, then it probably isn't an issue. I once traveled in a car with a leaking LPR and the gas smell was very strong, even nauseating while in the car. When that car was parked in a garage, the smell was quite strong and unmistakable, despite the fact that the leak would stop when the car was turned off.

    KIRK

    Leave a comment:


  • Philster
    replied
    Re: Gas Smell

    Where would I get a Low Pressure Regulator valve?

    Leave a comment:


  • siai47
    replied
    Re: Gas Smell

    The only thing I can think of (beyond the obvious, its normal) is that the low pressure lockout valve is not seating and allowing pressure in the line between the HPR and the lockout valve to bleed through the low pressure regulator and out through the air cleaner. Only a guess

    Leave a comment:


  • Philster
    replied
    Re: Gas Smell

    UPDATE:

    It appears that the smell is only present after I fill the car up on my way home. The two days that I filled up in the morning before driving my 100 mile commute, I did not have any smell. The two days that I filled up just before returning home, the smell was there. If this is the case, I will just fill up in the morning. I have checked the line connections that are below the air filter and cannot see any leak, and the smell is only present by the air filter. My main concern is that I have my boiler for my home in my garage and I really don't want to expand my garage through an explosion. Is it possible that the fueling station that I use overfills my tank or something like that?

    Thanks for your input, I really am enjoying driving and paying for the fuel for my car.

    Philster

    Leave a comment:


  • Yroc
    replied
    Re: Gas Smell

    Is that a fumigated system or port injected? If it's fumigate and you are smelling it through the air filter, then that is normal. You can check all your connections with soapy water to make sure you don't have a leak, but it sounds like you are smelling it through the air filter? That should just be the gas left in the hose that runs from your regulator to your intake.

    Leave a comment:


  • kirkbenge
    replied
    Re: Gas Smell

    My brother had a similar problem. Check out this post(Smell gas in 2001 Cavalier) for some useful information and links regarding where you can get parts etc.

    Leave a comment:


  • Highmarker
    replied
    Re: Gas Smell

    Philster,

    I have moved your thread into the GM/Chevy Vehicles forum so that those with GM/Chevy expertise can chime and answer your question. Here is what I know:

    It sounds like your problem is coming from the Low Pressure Lockout (LPL) or the Low Pressure Regulator (LPR). The LPL is located just before the LPR, it is a small solenoid in the CNG line. The LPR is the large cylindrical part on top of the engine. You can spray some soapy water on the LPL and see if it creates bubbles. Bubbles = Leak; No Bubles = No Leak. If either one is leaking, they need to be replaced. You can get a replacement kit for the LPR on the internet.

    Leave a comment:

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