RE: [Chrysler300] stumble

["Bob Jasinski" <rpjasin@xxxxxxxxxxx>]

I can't speak about '58 Chevy carbs, but the carbs on my G have no rubber
parts except the nitrile tip on the float needle valve, and that has
presented no problem with fuels containing alcohol.  Older fuel pump
diaphragms can fail, yes, but I have not seen the problem with carbs.  The
accelerator pump in the 2903S 300G carb is leather, not rubber, and I'll bet
most other letter car carbs are too.
 
Bob J 

  _____  

From: Chrysler300@xxxxxxxxxxxxxxx [mailto:Chrysler300@xxxxxxxxxxxxxxx] On
Behalf Of Keith Boonstra
Sent: Monday, November 23, 2009 7:04 AM
To: bluesport62
Cc: Chrysler300@xxxxxxxxxxxxxxx
Subject: Re: [Chrysler300] stumble


  

I wonder if you had your carburetor rebuilt before the prevalence of 
ethanol. I had a terrific rebuild done a number of years back on my '58 
Chev carb, but then along came 10% ethanol and it ate the rubber parts 
in the carb - including the accelerator pump. I had the same coughing, 
backfiring you are having. The only solution was another rebuild - this 
time with the blue rubber parts (withstands ethanol attack) and now it 
runs great. Check to see if you get a _strong_ squirt from the pump, 
and if you don't I'll bet that's your problem.

BTW if you're into the carb anyway, you might like to try going up a 
size on your main jets to compensate for the ethanol as well. I did 
that on my '70 4-4-2 and the difference amazed me. I swear it gave me 
at least another 50 hp.

Good Luck
Keith Boonstra
Holland, Michigan

-

bluesport62 wrote:
> 
>
> HI GANG. CAN ANYONE GIVE ME AN IDEA WHAT TO LOOK FOR. ON MY 62 SPORT 
> 383WHEN I PUNCH IT FROM A DEAD STOP IT BACKFIRES AND STUMBLES. I HAVE 
> DONE ALL THE NORMAL STUF. CARB WAS REBUILT BY AN EXPERT 40 YEARS IN 
> THE BUSINESS CHANGED PLUGS WIRES AND PLUGS HAVE MOPAR ELECTRICT 
> IGN.TIMEING IS SET AT 10 DEGREES.I KNOW IT SOUNDS EASY BUT I AM STUCK 
> ON THIS ONE.IS THERE ANYTHING I AM OVERLOOKING. 3000 MILES ON REBUILD. 
> THANKS . JOE LUCIANO HOWARD BEACH N.Y.
>
> 

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