CFM rating not that critical , ever, so not that. A new carb might fix it but not for that CFM reason. Carb is always full when you first floor it..so should run a few seconds ok, then starves? If not doing that, they simply do not provide fuel, plugged flow to secondary throats in carb? Dimly remembered, There is a tiny gasket in AFB kits where secondary venturi attaches to carb body. I dimly (also!) remember these two gaskets are different hole patterns and will fit upside down, so 4 ways to go wrong there ?? Any correlation to problem and work done on carb? Or might be error from long ago. I found this once on a rebuilt AFB ram carb that did not work right.
Okay, still having some problems with fuel delivery on our 300K.
Here is a quick rundown on what we have had done. Carb was cleaned and fitted with a new carb kit. Floats were set at 23/32 spec?
Items replaced: Fuel pump, fuel pump push rod, fuel filter and all rubber fuel lines.
Fuel tank was removed and sending unit inspected. Blew out fuel lines.
After all of this we still are starving for fuel when the 4barrel kicks in. Also a little harder to start and (at times) some throttle hesitation on normal acceleration.
One question the mechanic had was the engine rebuilt with bored cylinders etc and needs a higher CFM carb. I do not have any history on the engine other then it has been rebuilt.
Any help will be much appreciated! Mark
Arthur L. Davis Publishing Agency, Inc.
ph. 800-626-4081 ext. 1303 cell 319-240-8083
Let's assume the problem is not with the carb.
There are 3 pieces of "rubber" fuel line in the system.
If they are old, they need to be replaced to
ensure you aren't drawing air into the system through an
age crack in the old hose, or perhaps a blockage in the hose.
One is at the fuel tank, connects the sender to the pipe.
One is in the area of the front passenger foot well, connects
the pipe to the next pipe.
The other is from that pipe to the fuel pump inlet.
It is a pretty easy job to replace these pieces with new line.
I think the diameter is 5/16".
It could be the problem is with the fuel sock on the sending unit. If
the tank has rust in it, the sock will plug. While it isn't a terrible job to
get the sending unit out, it takes a while.
If you suspect the sock, but would rather not get into the sending unit,
you could try running the car from an aux fuel tank. Run a long
piece of fuel hose from the fuel pump inlet to an aux tank which
you could place in the pass front seat. Have someone hold the aux tank
so you don't get spills. If the carb performs off the aux tank system, you
know where your fuel restriction is (or isn't).
Posted by: "John Grady" <jkg@xxxxxxxxxxxxxxxxx>
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