Rochester Carb Challenge - The 1947 - Present Chevrolet & GMC Truck Message Board Network

OregonC20 · 10-16-2009, 09:34 PM

I purchased a freshly rebuilt Q jet Rochester 4 barrel carburetor from Carb Junky's a few months ago and I had a local shop installed and tuned the carb in my truck. I have a 1970 chevy big block. I took the truck back twice to the same shop because the truck would die on me while driving after 10-15 minutes of driving it , no issues during the first minutes of driving when I started the truck after sitting overnight. I would press the gas pedal and the truck would stall out. The shop then started blaming Carb Junky's for not rebuilding it right. Anyways, I took my truck to a more reputable shop and had the carb rebuilt again, only to take back again because the truck was hesitating when I soft press the gas pedal. Now I am being told that "the accelerator pump is malfunctioning or/and keeps breaking". I was also told the the gas in the truck "has a funny odor" and I was asked if I had put a gas additive in the gas tank, which I did not. Hopefully they will figure this one out soon. Thank you for reading.

tires2burn · 10-16-2009, 09:53 PM

Check your vacuum. A leak will act like what your saying. I had the same going on and after it warmed up it was ok. Dan

unclewatts · 10-16-2009, 11:56 PM

Quote:

Originally Posted by tires2burn

Check your vacuum. A leak will act like what your saying. I had the same going on and after it warmed up it was ok. Dan

Right. Check every port on that carb that isn't being used.

dwcsr · 10-17-2009, 12:16 AM

I had the same issue I put a phenolic spacer under it. it stopped the problem. What happens is when it gets hot after about 15 minutes the gas boils out of the bowl and pours down the carb.

mclairmo · 10-17-2009, 08:56 PM

Get a Holley.

10-16-2009, 09:34 PM	#1
OregonC20 Registered User Join Date: Oct 2006 Location: Salem, Oregon Posts: 250	Rochester Carb Challenge I purchased a freshly rebuilt Q jet Rochester 4 barrel carburetor from Carb Junky's a few months ago and I had a local shop installed and tuned the carb in my truck. I have a 1970 chevy big block. I took the truck back twice to the same shop because the truck would die on me while driving after 10-15 minutes of driving it , no issues during the first minutes of driving when I started the truck after sitting overnight. I would press the gas pedal and the truck would stall out. The shop then started blaming Carb Junky's for not rebuilding it right. Anyways, I took my truck to a more reputable shop and had the carb rebuilt again, only to take back again because the truck was hesitating when I soft press the gas pedal. Now I am being told that "the accelerator pump is malfunctioning or/and keeps breaking". I was also told the the gas in the truck "has a funny odor" and I was asked if I had put a gas additive in the gas tank, which I did not. Hopefully they will figure this one out soon. Thank you for reading.

10-16-2009, 09:53 PM	#2
tires2burn Registered User Join Date: Apr 2009 Location: Tacoma,Wa Posts: 84	Re: Rochester Carb Challenge Check your vacuum. A leak will act like what your saying. I had the same going on and after it warmed up it was ok. Dan

10-17-2009, 12:16 AM	#4
dwcsr Hollister Road Co. Join Date: Apr 2005 Location: Houston Posts: 6,134	Re: Rochester Carb Challenge I had the same issue I put a phenolic spacer under it. it stopped the problem. What happens is when it gets hot after about 15 minutes the gas boils out of the bowl and pours down the carb. Last edited by dwcsr; 10-17-2009 at 12:16 AM.

10-17-2009, 08:56 PM	#5
mclairmo Registered User Join Date: Jan 2006 Location: Take Off Posts: 1,908	Re: Rochester Carb Challenge Get a Holley.



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