01-28-2018, 04:31 PM | #51 | |
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Re: Overheating issues
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01-28-2018, 04:52 PM | #52 | |
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Re: Overheating issues
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After I saw this I started looking more & more into vapor lock, heat soak & boiling fuel in the fuel lines, really was an eye opener for me. All of the symptoms were exactly what I was dealing with. May want to take a look and see if this may be your problem as well. Also, do you have a spacer between your carb & manifold? I had put one under mine a while back, helped it a little but didn't solve the problem. A lot of people have said it had fixed their "hot" carb issues. It's called a phenolic spacer, but don't get an aluminum one, get a plastic or composite one. Aluminum will still allow the heat to transfer from your manifold to carb. |
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01-28-2018, 07:13 PM | #53 | |
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Re: Overheating issues
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02-17-2018, 07:59 AM | #54 |
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Re: Overheating issues
So here is my follow up. I initially purchased -6an line and fittings to run the fuel lines. I had a question about the Aeromotive regulator so I called Aeromotive tech support and ran it by him. The first concern he had was that because I would be running an Aeromotive Stealth 340 pump that I might not be able to get the psi down to the 5psi I was after. He suggested going with a bigger -8an line and fittings. So I bought all new -8an lines and fittings (and returned the -6an stuff) and went to work plumbing and wiring it up. After I got it all buttoned up I took it out for a short test run...no problems, no leaks. The next day I took it on a 45 minute run and drove it hard to try and get it to replicate the issues I was having. Not one single problem! Every light & stop sign she purred like a kitten! It ran better than it ever had before. No more idling really low & funny like she wants to die at stop signs. I have already had her out on several longer runs, longest was 1.5 hours and she runs & idles perfect AND she doesn't seem to be running hot anymore either. I can't get it past 194 degrees, granted it's only been in the upper 70's and low 80's here lately, but before the upgrade it really didn't matter the temps before she got hot and ran like crap.
Here is what all I bought. Aeromotive Stealth 340 in tank pump with Boyd's mount (matches the tank) Aeromotive universal Regulator Russell -8an Pro Classic II black braided fuel lines Russell -8an fittings Edelbrock fuel pressure gauge Misc clamps and hardware. Last picture shows everything hooked up. Nobody makes an Edelbrock carb bracket to mount a fuel regulator (that I could find), only Holley, which didn't fit. So I fabricated something quick, which I will eventually make a better one. Also, need a 90 fitting to tuck in the feed line that's over the valve cover, just haven't done it yet. |
02-17-2018, 08:30 AM | #55 |
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Location: Guntersville Alabama
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Re: Overheating issues
Looks good . Got the fuel line away from the heat .
So in the end the fuel was getting very hot and causing the carb to run hot and lean and causing the engine to run hot because of the lean condition and then vapor lock and shut the engine down until it cooled off enough to cool the fuel to restart . Its always nice to fine the smoking gun . Time to drive the wheels off that thing . |
02-17-2018, 05:16 PM | #56 |
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Re: Overheating issues
Interesting, I was begining to think it was a heat soaked distributor or module unit.
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02-19-2018, 09:00 PM | #57 |
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Location: Colorado Rocky Mountains
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Re: Overheating issues
I am glad your new fuel lines/ routing has helped the issue!
My .02 cents worth, based on my issues with the same problem is alcohol in the fuel. My truck had similar issues until I found a source of alcohol free premium fuel. No hot idle / dieing issues at ALL after changing fuels. This was on a 350, eddy 600, eddy performer RPM intake, no pressure reg, stock chevy fuel pump. Ethanol sucks !!! All the Best, Dirk |
02-20-2018, 01:11 PM | #58 |
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Re: Overheating issues
Interesting diagnoses for sure. In the past I've seen and had several overheating issues caused by various failures and I've had vapor lock issues but never vapor lock causing the overheating. That's one for the books.
Thanks for posting solution.
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68 GMC 250/3 speed Saginaw p/b p/s 69 Chevy 350/350 currently in pieces still lookin for a cab 06 Trailblazer I just want a vehicle that I can work on, that won't talk to me, leave error msgs or keep track of how I drive... |
02-20-2018, 08:35 PM | #59 |
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Re: Overheating issues
Thanks for the follow up and great write up!
I have a similar issue with a SB in my Nova. I was leaning towards a fuel system upgrade anyhow.
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02-21-2018, 02:30 AM | #60 |
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Re: Overheating issues
One thing I've learned throughout all this, fuel systems are a very important part of good running motor. Most people can get away with using a factory setup. Some (including myself) run into problems, for whatever reason, with the same stock setup. I kept chasing down the overheating part not even thinking it could have been fuel related. We get these vehicles and right off start upgrading this & that, bigger carb, better heads, larger radiator, etc... But aside from upgrading the stock mechanical fuel pump we never really pay much attention to the fuel system. I always focused on the compression and spark side of things and never gave a second thought to the fuel delivery as long as it worked. There is a whole lot more to it than I thought...and now I know
I am happy (now) that I was able to find the issue and resolve it. Could not have figured it out without the help of you guys here on the best Chevy truck board! Never had these problems before so going forward I will have a better idea if I run into this issue in the future. Funny thing is that my son's 72 Nova, which sits at my house and drive now & again, has a 350/350, same carb, same intake, same distributor, same fuel pump, similar radiator with a clutch fan and has never got hot?!?!? |
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