What's Happening with my Carter AFB?
#191441
01/12/09 02:13 PM
01/12/09 02:13 PM
|
Joined: Apr 2003
Posts: 1,286 Ft. Lauderdale, FL
solarguy
OP
pro stock
|
OP
pro stock
Joined: Apr 2003
Posts: 1,286
Ft. Lauderdale, FL
|
here's my combo. 70 340 Cuda, 727, 3000 stall, 3.73 gears, mopar 484 cam, MSD Ignition, 12*initial, 30* total timing all in by 2500. recent tune up including fuel filter, 5/16 fuel lines new
Car has developed a hesitation under hard accelaration around 4200 RPM, Falls flat, no backfiring or anything just cuts out, let off the gas to allow it to "catch up" and it takes off from there to my self imposed 5500 red line. Symptoms get worse as motor gets more and more warmed up.
I found the accelarator pump to be a little weak so I changed it and replaced fuel pump with new carter mechanical pump for good measure. while carb apart for acc. pump change, I cleaned and blew out all the passages and checked the float level, 7/16 and 1" per manual blew through fuel inlet while operating floats to confirm needle and seats working, everything checks ok. once assembled, car ran like a bat outta he..
Cut to one week later, hesitation comes back. I look at acc pump shot and it's weak again like ther's too little fuel in the bowls. getting broken stream. I've been through 2 differnt tanks of gas, checked and rechecked ignition. I'm tempted to raise floats to allow more fuel in bowls but I know the float range is within spec. I borrowed a friends 750 demon carb and while it was jetted a little rich for my combo, it cured my ills so I know it's in my carb.
I guess my question is why is my acc pump shot so weak and how high can I go with the fuel level in the bowls before flodding? I think the acc pump is good, (1 week installed new edelbrock), just starving so where is the fuel going or not going.
Thanks
|
|
|
Re: What's Happening with my Carter AFB?
[Re: solarguy]
#191446
01/12/09 04:16 PM
01/12/09 04:16 PM
|
Joined: Nov 2003
Posts: 36,041 Lincoln Nebraska
RapidRobert
Circle Track
|
Circle Track
Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
|
The symptoms sound like textbook fuel starvation from the fuel delivery system. If you hooked up a gas can in the eng compartment to the pump inlet & went for a spin I believe you'd have an answer in <30 minutes.
live every 24 hour block of time like it's your last day on earth
|
|
|
Re: What's Happening with my Carter AFB?
[Re: rm23j8g]
#191449
01/13/09 01:08 PM
01/13/09 01:08 PM
|
Joined: Apr 2003
Posts: 1,286 Ft. Lauderdale, FL
solarguy
OP
pro stock
|
OP
pro stock
Joined: Apr 2003
Posts: 1,286
Ft. Lauderdale, FL
|
Thanks rm, I haven't ruled that out as well. With all the techron, ethanol, etc in the gas here, it's gotta be rough on rubber parts. today I puled sending unit, sock not too bad. ordered replacement sock, acc pump and carb calibration kit. I will get to the bottom of this as soon as parts arrive.
|
|
|
Re: What's Happening with my Carter AFB?
[Re: solarguy]
#191454
01/13/09 04:52 PM
01/13/09 04:52 PM
|
Joined: May 2003
Posts: 15,487 Florida
scratchnfotraction
I Live Here
|
I Live Here
Joined: May 2003
Posts: 15,487
Florida
|
this summer in central FL,my eddy went to flooding every time I drove it swithed to a Q-jet it went about a month till the same thing put a kit in they eddy and its fine now I found a lot of varnish and grains of rust colerd crap all in it same thing in the Q-jet they switch gas and I have had no more probs since I would soak it,give it a good blast of air to clean passages just for good measure anyways IMO with the price of gas I going back to the Q-jet, its much better on the MPGs,I was at 19 mpgs in a truck and down to 12-13 with the eddy just a change in carbs is a big diif
|
|
|
Re: What's Happening with my Carter AFB?
[Re: solarguy]
#191455
01/13/09 05:41 PM
01/13/09 05:41 PM
|
Joined: Jan 2003
Posts: 9,436 Blair County,PA
62maxwgn
master
|
master
Joined: Jan 2003
Posts: 9,436
Blair County,PA
|
Quote:
It's a 625 AFB, electric choke. There is a check ball and weight in the passage leading to the pump discharge nozzles and it's clear of debris. The one you have pictured looks like one of my jets , I don't recall seeing that type in mine. I am going in again once parts arrive in mai
Thanks
It is in the bottom of the driver side fuel bowl.Goes into the pump well on an angle.The ball is spring loaded.When the pump is raised it draws fuel from the bowl to the pump well.When pump is in down stroke the ball is seated and fuel then goes to the discharge nozzle.If there is debris in it you will get the condition you have as some of the fuel will leak past and go back into the bowl.
|
|
|
|
|