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Old 07-03-2016, 06:02 PM
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I'm beginning to hate Demon

Now all a sudden the front float will adjust to the point of running the engine out of gas or if I adjust it even a little it over flows into the carb. I pulled it out and tested it out in a pan of water and it floats just fine. I'm not going to talk about catching the garage on fire today. To much gas.

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Old 07-03-2016, 06:06 PM
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Fuel pressure reading is ?
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Old 07-03-2016, 07:17 PM
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I have ran into issues before to where everything was fine but for some reason after I changed my floats I kept having problems where the front float would want to stick here and there and I kept adjusting it over and over again and had several times it was spewing gas and the worst time and I am glad I found it was something sounded funny and it turned out I had tapped on the adjuster screw so many times that it somehow got loose and I had fuel spraying everywhere and could have caught on fire and I was on my way to work and it was dark out and I heard this rushing sound and that was it.

What my issues turned out to be was the float hinge itself was bent a little on the tabs but you could not see it and it would not ride the roll pin smoothly and thus would hang up once in a while and the float would not go up and down like it was supposed to. I took it out and bent the tabs to where the float would go up and down smoothly and not hang up any more and my problem was solved. Yours might be fuel pressure related or I have came across bad needle and seats out of the box that was brand new but would not work right and never seal and I changed it out to another new one and it was fine. Also a thing to check is to make sure the rubber o ring is not loose on the needle and seat or it will allow fuel to leak by as well and not seal at all and make sure to put a tiny bit of vaseline on it before you stick it in you don't damage it.
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Old 07-03-2016, 07:39 PM
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Quote:
Originally Posted by JeffB View Post
Fuel pressure reading is ?
No fuel pressure gauge on my machine. Electric pump is probably fairly old. Probably 5 to 7 psi.
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Old 07-03-2016, 07:56 PM
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I would check it to be sure..
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Old 07-03-2016, 08:55 PM
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Not sure what hat Demon means but if there's problems with Demon products know Barry Grant went down back when because of selling underdeveloped stuff to people who believed in the name and refusing to back it up. All BG/Demon parts on my cars, long since replaced at my cost.
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Old 07-03-2016, 09:20 PM
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Not sure what hat Demon means but if there's problems with Demon products know Barry Grant went down back when because of selling underdeveloped stuff to people who believed in the name and refusing to back it up. All BG/Demon parts on my cars, long since replaced at my cost.
That was suppose to mean Hate demon...

Ya read about Barry Grant.
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Old 07-04-2016, 01:52 PM
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I took the float out and polished it... it works now. Now to find out what that clanking noise is...
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Old 07-04-2016, 02:00 PM
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Quote:
Originally Posted by Rodder steve View Post
I took the float out and polished it... it works now. Now to find out what that clanking noise is...
That's the warning sound reminding you to buy a QFT.
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Old 07-04-2016, 02:59 PM
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Now that Demon is now part of the Holley Group and no longer part of Barry Grant has there been an improvement in quality ? Anyone using the AFB based Demon ? Like this one: https://www.youtube.com/watch?v=LRwlIC_pnpk

Last edited by JeffB; 07-04-2016 at 03:04 PM.
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Old 07-04-2016, 03:52 PM
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Quote:
Originally Posted by JeffB View Post
Now that Demon is now part of the Holley Group and no longer part of Barry Grant has there been an improvement in quality ? Anyone using the AFB based Demon ? Like this one: https://www.youtube.com/watch?v=LRwlIC_pnpk

That's not AFB based, that is based on the Carter ThermoQuad....just cleaned up a little.

The Edelbrock Performer carb line is based on the Carter AFB(Aluminum Four Barrel) for most of it's offerings, with the newest additions are based off the Carter AVS(Air Valve Secondary) series, I believe Edelbrock calls them Thunder Series AVS.
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Old 07-04-2016, 06:05 PM
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Originally Posted by ericnova72 View Post
That's not AFB based, that is based on the Carter ThermoQuad....just cleaned up a little.

The Edelbrock Performer carb line is based on the Carter AFB(Aluminum Four Barrel) for most of it's offerings, with the newest additions are based off the Carter AVS(Air Valve Secondary) series, I believe Edelbrock calls them Thunder Series AVS.
There are two versions this being more AFB/Edelbrock with a solid aluminum body https://www.holley.com/products/fuel...mon/parts/1900 The Thermoquad got a bad rap when I was at M&M speed the mechanics from the Ca Highway Patrol were buying Carter Strip Kits from us for the 440 Dodge cruisers.We were right off the Highway 80 freeway you could hear them sucking air when they left on a pursuits,really a cool sound.

Last edited by JeffB; 07-04-2016 at 06:12 PM.
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Old 07-04-2016, 08:40 PM
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Quote:
Originally Posted by JeffB View Post
There are two versions this being more AFB/Edelbrock with a solid aluminum body https://www.holley.com/products/fuel...mon/parts/1900 The Thermoquad got a bad rap when I was at M&M speed the mechanics from the Ca Highway Patrol were buying Carter Strip Kits from us for the 440 Dodge cruisers.We were right off the Highway 80 freeway you could hear them sucking air when they left on a pursuits,really a cool sound.
That new Demon is still the ThermoQuad design though, just pretty'ed up with a aluminum center body in that version.....and Holley/Demon does also sell it with the original ThermoQuad design Phenolic plastic black center body if you want it that way.

https://www.holley.com/products/fuel...mon/parts/1901

It is nothing like the AFB at all in design, there are few interchangeable parts between them. That new Street Demon is just the basic ThermoQuad with all the factory bunch of vacuum line taps removed from it, and the castings smoothed to look better and polished.

It would be interesting to know if they stayed true enough to the original ThermQuad that you could use the new composite fuel bowl/center body to resurrect an old original ThermoQuad....as that body was the weak link back then, got warped or cracked a lot of the time...... the Mopar guys still love that carb though, and pay good for old body's in usable condition.
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Old 07-05-2016, 01:48 AM
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there are also private label summit M8600 carbs... these are actually holley 2110 and 2111 models.. but they are derived from the Autolite 4100 carbs.. with a holley style holley style secondary diaphragm..

these use standard holley main jets and tune just like them.. but as an additional feature.. the primary booster assembly comes out for easy changes to the Idle feed restriction and the accelerator pump shooter restrictions..

https://www.summitracing.com/parts/s...00vs/overview/

https://www.summitracing.com/parts/sum-m08041/overview/
read the instructions linked below.... except for the location the theory is for all carbs..

https://static.summitracing.com/glob...-m08040-41.pdf

whats old is new again..
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Old 07-05-2016, 01:08 PM
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If you want to get a regular holley style carb in place of the street demon that summit carb would be the best bang for the buck if you want to keep it similar with the two piece design which allows you to take the top off and not have to take the carb off the intake but if you looking to buy a regular traditional style holley carb I recommend a quick 600 or 750 street slayer carb as they have the options to change everything out from air bleeds to idle feed restrictors and power valve restrictors and allows jets in the rear as well as the metering plate they have in it has screw in idle feed restrictors and takes jets so you can jet up and down and for just a little over $300 is the best price and option available for not having to pay $300 for a new carb and then spend more to get a secondary metering block and then doing your own customizing work to allow the changing of the idle feed restrictors etc. If it was me I would spring for the quick fuel slayer carb as they are pretty nice carbs for the price compared to a similar holley brand. Second would be the summit one.
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