Re: AVS is sinking floats
[Re: cbusters]
#2435903
01/16/18 09:13 PM
01/16/18 09:13 PM
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Joined: May 2003
Posts: 96,661 On The Boat, On The Lake, Wa. ...
amxautox
Still Retired. Still Posting on Moparts. A Lot.
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Still Retired. Still Posting on Moparts. A Lot.
Joined: May 2003
Posts: 96,661
On The Boat, On The Lake, Wa. ...
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Install an electric pump. Use it to fill the carb. Turn that pump off. Then use the key to crank over and start the car, while using the mechanical pump for the start and run. Check the timing.
Tom
"Everyone should believe in something; I believe I'll go fishing."
-Henry David Thoreau
Men and fish are alike. They both get into trouble when they open their mouths
author unknown
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Re: AVS is sinking floats
[Re: cbusters]
#2435937
01/16/18 09:59 PM
01/16/18 09:59 PM
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Joined: Aug 2003
Posts: 1,145 ontario calif
ns1aar
super stock
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super stock
Joined: Aug 2003
Posts: 1,145
ontario calif
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I have had this problem also. Yes it backfired and the flash was hot enough to melt the solder opening a small hole in the seam of the float halves. It alowed enough fuel into the foat to sink it resulting in raw fuel dumping into the motor.Didn't find until I took the float out and shook it
NS1AAR
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Re: AVS is sinking floats
[Re: cbusters]
#2436089
01/17/18 01:25 AM
01/17/18 01:25 AM
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Joined: Aug 2003
Posts: 1,145 ontario calif
ns1aar
super stock
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super stock
Joined: Aug 2003
Posts: 1,145
ontario calif
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On mine it was going thru the hole on the driver side where the rubber flapper valve is that opens and closes with the accelerator pump
NS1AAR
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Re: AVS is sinking floats
[Re: ns1aar]
#2436189
01/17/18 10:27 AM
01/17/18 10:27 AM
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Joined: May 2005
Posts: 784 Florida
cbusters
OP
super stock
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OP
super stock
Joined: May 2005
Posts: 784
Florida
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On mine it was going thru the hole on the driver side where the rubber flapper valve is that opens and closes with the accelerator pump I don't see how the flame could go in from the top. This has to be in a power valve type of circuit. Maybe up through the jet, around the power rod when it is lifted up. It then flashes when there is very little fuel in the bowl and goes back out.
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Re: AVS is sinking floats
[Re: cbusters]
#2436295
01/17/18 01:31 PM
01/17/18 01:31 PM
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Joined: Aug 2003
Posts: 1,145 ontario calif
ns1aar
super stock
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super stock
Joined: Aug 2003
Posts: 1,145
ontario calif
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It happened long ago with real gas. 69 440 HP DD Ya it had a few miles on the motor. It did back fire and started running rich. I took the carb apart and found the float sitting on the bottom of the bowel. When I removed the float and shook it there was liquid in it but did not leak. There was a small sooty black mark around a bright spot in the solder on the float. This was just under the opening on the driver side where the accelerator pump is located. Some solders melt at fairly low temps. Apparently the solder melted long enough to allow some fuel inside and as it cooled resealed the float. Gas in an open container doesn't explode it burns. So I guess with an open source of fuel a little oxygen and a ignition source it can't happen. Aerodynamically Bumble Bees can't fly either
Last edited by ns1aar; 01/17/18 02:12 PM.
NS1AAR
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Re: AVS is sinking floats
[Re: cbusters]
#2436584
01/17/18 09:54 PM
01/17/18 09:54 PM
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Joined: Aug 2003
Posts: 1,145 ontario calif
ns1aar
super stock
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super stock
Joined: Aug 2003
Posts: 1,145
ontario calif
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Here is a pic of the latest episode. The first time actually burned a big hole in the gasket above the float. This time is was just a little spot on the gasket and the float is all black in spots, while the other side is pristine.Time in between incidents is about 2 years and less than 1000 miles. Gasket was replaced with a new one. Interesting note repeating from an above comment. The float does not leak but is about a quarter full of fuel. Both times!
Look on the soldered seam you should find where the solder melted should be about where the burn mark is on the gasket
NS1AAR
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Re: AVS is sinking floats
[Re: cbusters]
#2436652
01/18/18 12:35 AM
01/18/18 12:35 AM
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Joined: Jan 2003
Posts: 14,498 So. Burlington, Vt.
fast68plymouth
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 14,498
So. Burlington, Vt.
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If you don’t want to put an electric pump on it, just crank it over without pumping the gas pedal or setting the choke until after it’s had enough time to fill the bowls.
The pump it a few times and it should take off.
Today’s pump gas is lacking some of the additives that used to be there for vapor lock, etc.
IMO, an electric pump in the rear is a good idea for anyone these days.
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123 Dealer for Comp Cams/Indy Heads
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Re: AVS is sinking floats
[Re: rarefish]
#2436832
01/18/18 01:48 PM
01/18/18 01:48 PM
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Joined: Jan 2003
Posts: 9,436 Blair County,PA
62maxwgn
master
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master
Joined: Jan 2003
Posts: 9,436
Blair County,PA
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I had one of the floats sink on my AVS last fall. When I removed it you could hear and feel the gas sloshing around inside of it. The strange thing is that I was unable to shake any gas out of where the leak was. I drilled a tiny hole in the float and drained out the fuel then soldered the hole back up and reinstalled the float. Problem solved for now, but I'm wondering if it is only temporary. It will leak again.Wipe the float dry,lay it down in various positions,eventually you will see where it is leaking,you can re solder it but just as easy to replace it.Just went through that a week ago on a friends Sport Fury.
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Re: AVS is sinking floats
[Re: cbusters]
#2437521
01/19/18 03:44 PM
01/19/18 03:44 PM
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Joined: Dec 2005
Posts: 1,156 Cruising!
QuickDodge
super stock
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super stock
Joined: Dec 2005
Posts: 1,156
Cruising!
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You may not have any problem other than the float bowls being dry. A lean air / fuel mixture can cause an engine to back fire through the intake. (A rich mixture will be through the exhaust.) With the float bowl being dry, the mixture is likely to be lean while the float bowl is filling.
If it was my car, I would very carefully check out the ignition system to make certain there is not an ignition problem as well. It is entirely possible the car has two problems. Gasoline burning inside the carburetor is not good!!
Last edited by QuickDodge; 01/19/18 03:46 PM.
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Re: AVS is sinking floats
[Re: dartgame]
#2437536
01/19/18 04:05 PM
01/19/18 04:05 PM
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Joined: Jan 2003
Posts: 2,252 New York
rarefish
top fuel
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top fuel
Joined: Jan 2003
Posts: 2,252
New York
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It’s been said a bunch of times above - you’ve got some sort of timing issue if it backfires. Make sure your timing marks are correct on the damper, use a positive stop on piston #1.
I’m lazy, and decided not to install an electric fuel pump. What I do when my dart sits and the gas in the avs evaporates - is I take a small amount of gas (about a 1/4 cup) and pour it into the fuel bowls through the bowl vents. Then it starts immediately ! The only vent on a AVS that I know of is the one that is on the driver's side. It is fairly easy to add fuel to that side, but how do you add fuel to the passenger side bowl? Can it be done?
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Re: AVS is sinking floats
[Re: rarefish]
#2437963
01/20/18 02:56 PM
01/20/18 02:56 PM
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Joined: Mar 2006
Posts: 9,836 MI, usa
dvw
master
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master
Joined: Mar 2006
Posts: 9,836
MI, usa
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It’s been said a bunch of times above - you’ve got some sort of timing issue if it backfires. Make sure your timing marks are correct on the damper, use a positive stop on piston #1.
I’m lazy, and decided not to install an electric fuel pump. What I do when my dart sits and the gas in the avs evaporates - is I take a small amount of gas (about a 1/4 cup) and pour it into the fuel bowls through the bowl vents. Then it starts immediately ! The only vent on a AVS that I know of is the one that is on the driver's side. It is fairly easy to add fuel to that side, but how do you add fuel to the passenger side bowl? Can it be done? The holes right next to the metering covers. Doug
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Re: AVS is sinking floats
[Re: cbusters]
#2438013
01/20/18 05:12 PM
01/20/18 05:12 PM
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Joined: Jan 2003
Posts: 8,396 Highland, MI.
Sunroofcuda
master
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master
Joined: Jan 2003
Posts: 8,396
Highland, MI.
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Back in the 70's & 80's, the only carbs that would go dry after just a few days were GM Rochesters in my experience. You could only start GTO's after priming the carbs - it was maddening. NEVER had a Mopar with an AFB, AVS, or Thermoquad go dry - even after sitting for a month. My '71 Hemi Charger could sit all winter & it would fire in the spring after pulling the choke, a few pumps to the floor & a little cranking.
No Man With A Good Car Needs To Be Justified
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Re: AVS is sinking floats
[Re: dvw]
#2438323
01/21/18 12:00 PM
01/21/18 12:00 PM
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Joined: Jan 2003
Posts: 2,252 New York
rarefish
top fuel
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top fuel
Joined: Jan 2003
Posts: 2,252
New York
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It’s been said a bunch of times above - you’ve got some sort of timing issue if it backfires. Make sure your timing marks are correct on the damper, use a positive stop on piston #1.
I’m lazy, and decided not to install an electric fuel pump. What I do when my dart sits and the gas in the avs evaporates - is I take a small amount of gas (about a 1/4 cup) and pour it into the fuel bowls through the bowl vents. Then it starts immediately ! The only vent on a AVS that I know of is the one that is on the driver's side. It is fairly easy to add fuel to that side, but how do you add fuel to the passenger side bowl? Can it be done? The holes right next to the metering covers. Doug Doug, Is this the spot to fill the passenger side bowl?
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