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Re: AVS is sinking floats [Re: cbusters] #2437521
01/19/18 03:44 PM
01/19/18 03:44 PM
Joined: Dec 2005
Posts: 1,149
Cruising!
Q
QuickDodge Offline
super stock
QuickDodge  Offline
super stock
Q

Joined: Dec 2005
Posts: 1,149
Cruising!
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.
Re: AVS is sinking floats [Re: dartgame] #2437536
01/19/18 04:05 PM
01/19/18 04:05 PM
Joined: Jan 2003
Posts: 2,252
New York
rarefish Offline
top fuel
rarefish  Offline
top fuel

Joined: Jan 2003
Posts: 2,252
New York
Originally Posted By dartgame
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?

Re: AVS is sinking floats [Re: rarefish] #2437963
01/20/18 02:56 PM
01/20/18 02:56 PM
Joined: Mar 2006
Posts: 9,791
MI, usa
dvw Offline
master
dvw  Offline
master

Joined: Mar 2006
Posts: 9,791
MI, usa
Originally Posted By rarefish
Originally Posted By dartgame
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

Re: AVS is sinking floats [Re: cbusters] #2438013
01/20/18 05:12 PM
01/20/18 05:12 PM
Joined: Jan 2003
Posts: 8,390
Highland, MI.
Sunroofcuda Offline
master
Sunroofcuda  Offline
master

Joined: Jan 2003
Posts: 8,390
Highland, MI.
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
Re: AVS is sinking floats [Re: Sunroofcuda] #2438019
01/20/18 05:26 PM
01/20/18 05:26 PM
Joined: Jan 2003
Posts: 9,436
Blair County,PA
62maxwgn Offline
master
62maxwgn  Offline
master

Joined: Jan 2003
Posts: 9,436
Blair County,PA
The Rochester's had the same problem as the TQ's,leaking wells under main jets.

Re: AVS is sinking floats [Re: dvw] #2438323
01/21/18 12:00 PM
01/21/18 12:00 PM
Joined: Jan 2003
Posts: 2,252
New York
rarefish Offline
top fuel
rarefish  Offline
top fuel

Joined: Jan 2003
Posts: 2,252
New York
Originally Posted By dvw
Originally Posted By rarefish
Originally Posted By dartgame
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?

100_4553.JPG
Re: AVS is sinking floats [Re: cbusters] #2438806
01/22/18 01:02 AM
01/22/18 01:02 AM
Joined: Jul 2008
Posts: 606
Boise
M
Moparteacher Offline
mopar
Moparteacher  Offline
mopar
M

Joined: Jul 2008
Posts: 606
Boise
Check the underside of the AVS for main well plug leak. Too much time in the carburetor dip can damage the aluminum main well plug on the bottom allowing the fuel to drip out/into the manifold. If it's difficult to drive when cold then there's a miss-adjustment on the choke valve or the thermal bimetallic choke thermostat rod on the passenger side (pictured).

I'm pretty sure the factory correct carburetor base gasket will cover up the main well, but I'm not sure. Old age memory.

A stuck exhaust manifold flap valve (I forget the correct title) located in the passenger side manifold can cause the intake manifold to run too hot and boil the fuel. Make sure the spring loaded valve can open fully and move freely.

BTW, I too have a 1969 RR 383 with a 4615 AVS. Best of luck and we need more pics.

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