Carter AVS ?

[Beavis]

i just rebuilt a 68 carter avs carb for my 383 dart.

i installed everything in the rebuild kit.

i set all the floats to spec. and adjusted all the linkage.

after i get it running and it runs really good with the exception of when i first give some throttle it lags a bit, could this be a timing issue ?


the problem is when i shut it off, then it wont restart without pumping the crap out of the carb like 50 times.

i noticed when i pump the carb with the engine off, it squirts really good the first pump, but then no gas.

i put a new accelerator pump in the carb.

could i have the floats set wrong ??

 

[lewtot184]

low speed/idle jet lean condition. fixable.

 

[Garys1969RR]

Your pump should squirt at least 3 or 4 times with the fuel that's in the bowl before it fizzles out. Make sure your float level is correct, and the pump check valve (ball?) is in place. If that doesn't work, you may want to check with your partner. Can't remember his name, but I think it starts with a B. Lol.

- - - Updated - - -

Also try choking the carb when it won't start. If that works then you definitely have a too lean condition, as lewto said. Did you remember to put the springs under the enrichment rod plungers?

 

[furyus]

I rebuilt the AVS on my 69 340. My accelerator pump wasn't squirting properly. Opened it up, and the seal on the accelerator pump was all shriveled up. Put the old one back in.works fine. Probably cheap Chinese part in the rebuild kit.

 

[lewtot184]

on '69 and laters use the edelbrock pump.

 

[AR67GTX]

Does the Carter AVS feed the accelerator pump through a lower feed with a check ball, or does it feed the accelerator pump well through a notch in the top like the Edelbrock AVS series? I had a lot of issues with my Edelbrock 800 cfm carb (AVS style) with bogging and poor throttle response. I finally figured out that no matter which hole I put the accelerator pump link in, it wasn't raising the plunger enough to allow fuel to flow into the well through the notch in the side. I was basically shooting blanks when ever I gave it a little throttle. I had to bend the link considerably to get the plunger to retract high enough to just barely uncover the notch and allow fuel to fill the well. I had to set it well above the rebuild spec in their instructions and I special ordered the correct part number pump plunger from them. Might be something to check. Mine performs strongly now.

 

[lewtot184]

factory avs uses the check ball that is screwed in from float well. those 800's need work.

 

[rumblefish360]

What have you found with the 800 Edelbrocks?

 

[lewtot184]

in my experience the 800 is butt ugly rich OOTB. the one i've worked with quit a bit is on a 427 corvette. the carb works and drives great now but needed the primaries stepped way down and the accelerator pump circut re-worked. i'd like to try one on a mopar one of these days; if i can find a reasonably priced one.

 

[rumblefish360]

The accelerator pump circut re-worked? In what fashion if I may? Trying to learn something here.

 

[AR67GTX]

My Edelbrock 800 AVS is running strong now on my stock 440 HP. As noted above IMHO the accelerator pump design is really poor. Basically the plunger height has to be very carefully set so that the rubber uncovers the slot in the side of the well by a few thousands to allow fuel in. You wouldn't want it to uncover the slot very much or it would just force part of the pump shot back to the fuel bowl when you really nail the throttle. And then basically the throttle has to be completely closed to allow fuel to allow return of the plunger to the top position and refilling the accelerator pump well. With the Carter system, the suction from the return motion of the plunger as the throttle is backed off, un-seats the check ball and allows the well to start to re-fill.

I also bought my 800 used and when I finally got around to rebuilding it, I found it had had the jets and metering rods changed. After changing them back to stock the carb worked better.

 

[miller]

Good stuff!! Guess I can assume (getting dangerous, again) it's kinda the same way on all Edelbrocks?

 

[AR67GTX]

Good stuff!! Guess I can assume (getting dangerous, again) it's kinda the same way on all Edelbrocks?

Well assumptions are always dangerous but I suspect so. I actually suspect the Edelbrock AFB and AVS models share a common main body casting (and accelerator pump well design) and vary mostly in the top casting. But - not sure.

In Carter models, need a bit more shot from the accelerator pump - just move the rod to a hole closer to the pump shaft - no issues. Found out on my 800 Eddy that it's not that simple. Moving the rod on the linkage might require bending the rod to be sure the accelerator pump rubber is still coming to rest slightly above the fill port. The top of shaft to top plate measurement specs in the Edelbrock instructions were worthless in my case - not even close.

 

[lewtot184]

rumblefish; i removed any casting flash and lower the slot a little at the pump well. the OOTB check valve was a small ball and spring. i replaced the small ball with the next step larger and down sized the squirter from a .030+ (don't remember the exact size, but too big) to .024" and put the pump rod in the top hole. down sizing the main metering on the primary side was a big help. this was on an 800 avs.

 

[383man]

Are you saying when you shut it off hot that it wont restart when its warmed up without pumping the heck out of it ? You should not have to pump it hardly at all hot. And it should get more then one pump shot if the float level is right. That Carter AVS should have the normal inlet and outlet check balls on its pump. Seems the Eddy carbs fill like the Quadrajets do as they fill past the center of the pump plunger cup and then the cup seats on the plunger rod as soon as you touch the throttle and pumps fuel past the discharge ball or weight or both. Yours should just use an inlet check ball to fill but the discharge ball or weight has to seal also so it dont pull air in past it when you release the throttle. If it was mine by what you say I would pull the top of the carb and make sure the float level is right and then check the pump circuit and see why its not working right by checking the plunger and check balls. I would make sure the acell pump is working first and then go from there because if it stumbles or lags after the pump is fixed on light throttle it may be lean also. Ron

 

[rumblefish360]

Lewtot, thanks for the tips. I have an AFB & AVS, both 800. I like the AVS style better for the controllable secondary.

 

[Beavis]

when my car is hot, it wont restart without pumping the heck out of the carb.

 

[lewtot184]

do a hot fuel pressure test.

 

[Beavis]

you think the fuel pump might be bad ?

 

[lewtot184]

you think the fuel pump might be bad ?

maybe. the factory 2 valve carter pumps are crap.