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fuel leak in 79 chrystler 440
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jstuhl
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Dec 20, 2009, 6:28 PM
Post #1 of 14
(1995 views)
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fuel leak in 79 chrystler 440
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i have a 79 chrystler 440 that wont start and is suddenly leaking fuel from under the exhaust manifold. The top of the motor is dry, lines are not leaking. The fuel is running down the whole side of the block around the plugs. its hard to see under the manifold where the source of the leak is. The only thing under it though is the bottom of the valve cover. The engine has a 4bbl holley if that helps. I do know my way around an engine, but never seen this before. Anyone have a clue?
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Hammer Time
Ultimate Carjunky
/ Moderator
Dec 20, 2009, 6:33 PM
Post #2 of 14
(1993 views)
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Re: fuel leak in 79 chrystler 440
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Does the engine run? How good?
Obviously, it is very dangerous to run it with the fuel leak but I need to know if the engine runs normal.
If you installed an electric fuel pump on this you may have too much fuel pressure.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
(This post was edited by Hammer Time on Dec 20, 2009, 6:59 PM)
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jstuhl
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Dec 20, 2009, 6:40 PM
Post #3 of 14
(1988 views)
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Re: fuel leak in 79 chrystler 440
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It ran fine yesterday. Started right up, no gas pedal. Today, it wont start. It just keeps cranking. The fuel only leaks when I crank it and is across the whole side of the block. Thanks for responding, this is my rv, and Im kinda stranded but I do have my tools!
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Hammer Time
Ultimate Carjunky
/ Moderator
Dec 20, 2009, 6:58 PM
Post #4 of 14
(1979 views)
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Re: fuel leak in 79 chrystler 440
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That fuel has to be coming right out of the exhaust manifold. Look down the carb while cranking and see if fuel is leaking down the carb. Sounds like the needle and seat is stuck open in the carb.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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jstuhl
User
Dec 20, 2009, 7:10 PM
Post #5 of 14
(1974 views)
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Re: fuel leak in 79 chrystler 440
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Fuel does run from the jets inside the carb, but outside is all dry. I MAY have flooded it, but Ive still never seen this happen to a flooded vehicle. My old man just told me the same thing though. The needlevalve may be stuck. Does this sound like reasonable explanation to you? First thing in the morniing when I get some light I'll try that. Looks like Im bunkin here tonight, lol.
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Hammer Time
Ultimate Carjunky
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Dec 20, 2009, 7:17 PM
Post #6 of 14
(1972 views)
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Re: fuel leak in 79 chrystler 440
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That is the only explanation for where your seeing the fuel. Just be careful because just as much fuel likely went into the exhaust system and it could blow the muffler off when it fires.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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jstuhl
User
Dec 20, 2009, 8:09 PM
Post #7 of 14
(1969 views)
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Re: fuel leak in 79 chrystler 440
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thanks for the safety warning. Im hoping everything will dry overnight. I appreciate all your help. Ya ever need any help, be sure to hit me up.
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Tom Greenleaf
Ultimate Carjunky
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Dec 21, 2009, 9:44 AM
Post #8 of 14
(1964 views)
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Re: fuel leak in 79 chrystler 440
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Egad! Have a fire extinguisher at the ready while finishing diagnosis/fix as the fuel running into plugs really bothers me!
Check the oil. If flooding that badly it probably will show too full and smell of fuel by itself. Change it right away and again if needed.
It's "an out there" possibility there is a leak and you can't see it easily as I've seen both fuel and cooling systems make a fine fish-line type squirt you can't see well. That meaning the leak is away from where you find evidence! Run you finger/hand in any possible path that could happen or perhaps as our famous way2old uses talcum powder to find odd stuff like that.
BE CAREFUL!
T
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jstuhl
User
Dec 21, 2009, 12:32 PM
Post #9 of 14
(1957 views)
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Re: fuel leak in 79 chrystler 440
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I got 3 opinions on the matter and all pointed to pin and seat. So this morning , after it all dried out, I tapped around the carb (gently) to free the pin. To my surprise, there was a hole in the carb right under the pin the size of a quarter. I believe it was cracked, but I made it worse. It was not leaking from there, but I believe it was indeed cracked, malfunctioning the pin which flooded the engine. Needless to say, I lifted the carb and took the battery out. Now Im in search of a thermoquad 4bbl carb (used) for this 79 440. It has not been easy. I'll post a pic of it later, as my camera is not available at the moment. Autozone wants 350 bucks and cant get one till jan 9. I would love to see my family for Christmas...wish me luck!
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Tom Greenleaf
Ultimate Carjunky
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Dec 21, 2009, 7:10 PM
Post #10 of 14
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Re: fuel leak in 79 chrystler 440
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Thanks for posting what you found. I can't believe if it's available you can't get it next day?! Have you tried NAPA or other parts places? Speed shops - anything not to mess up your holidays! There's got to be a way to get that faster than that,
T
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jstuhl
User
Dec 21, 2009, 8:34 PM
Post #11 of 14
(1940 views)
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Re: fuel leak in 79 chrystler 440
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The good news is, I got a ride to my brothers house for the holidays. The bad news is, Ive been researching this thing all day, and found it to be a model 9211 Carter. These were only made 78-79. Im trying to crossreference with Holley for the availability to that verses carter. Its a spreadbore, 800-850 with 1 1/2" primaries. Or if I can find the center housing to this one. Its made of a material that is supposed to run 20 degrees colder, so Im thinking they must have broke a few, right? So there should be a replacement for that part and a rebuild kit. I'd really like to save this one if possible. I liked it when it ran. With the 440, I can spin duals and pull the front end way up on this 10,000 lb truck! Not that I do that alot, but I had to try it a couple of times, hea,hea.  Thanks for keeping up. I'll be posting more as I go through this for any other "Thermoquad" owners. I have some really good reference sites saved.
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chickenhouse
Enthusiast
Dec 22, 2009, 8:52 PM
Post #12 of 14
(1930 views)
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Re: fuel leak in 79 chrystler 440
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All I could find was a 9147 on E-bay for $60.00 Wonder if the housing would be diff. Posting number is 160389291089. Good luck to you & try to have a merry Christmas.
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chickenhouse
Enthusiast
Dec 25, 2009, 9:03 PM
Post #13 of 14
(1917 views)
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Re: fuel leak in 79 chrystler 440
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Just wondering if he seen the previous post.
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jstuhl
User
Dec 26, 2009, 7:53 AM
Post #14 of 14
(1911 views)
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Re: fuel leak in 79 chrystler 440
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Ive been keeping up with all the posts, thanks. Due to Christmas, I had to take a break from this mechanical headache,lol. Im gonna see what I can find around the local junkyards today. I did manage to have a nice holiday with my brother...but now its crunch time!
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