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| | | | Joined: Jul 2008 Posts: 111 Shop Shark | | Shop Shark Joined: Jul 2008 Posts: 111 | Hey fellas,
I got a 235cui with a Fenton dual carb setup in my 1957 Chevy 3200. Dual exaust as well. Am I crazy to think that the front carb will get more fuel than the rear carb? I figure the old saying that water will take to path of least resistance. My thought is that the gas is getting feed more than the rear since to line has to travel further back. (you can see pics in my signature below) a friend told me that some type of fuel regulator can be added to my line to evenly distribute to both carbs. Is this even necessary? thanks - J.R. in VA | | | | | Joined: Aug 2001 Posts: 1,299 'Bolter | | 'Bolter Joined: Aug 2001 Posts: 1,299 | The needle and seats in the carbs will make sure both bowls stay at the same level if floats are adjusted correctly. I don't see a need to worry as long as fuel line is sufficient size to feed both. | | | | | Joined: Jan 2000 Posts: 2,074 'Bolter | | 'Bolter Joined: Jan 2000 Posts: 2,074 | If your fuel is taking a path of least resistance then you have a carb problem. Both carbs need to be exactly alike, float settings, throttle settings, adjustments etc etc. You may need a fuel pressure regulator, but inline feeding both carbs equally.
If this set up runs good then don't mess with it. | | | | | Joined: Oct 2005 Posts: 1,317 Shop Shark | | Shop Shark Joined: Oct 2005 Posts: 1,317 | As was pointed out, the fuel pump will maintain pressure and volume to your float chambers. With everything equal in both carbs you shouldn't have any concerns. However, I've noted that the mechanical fuel pump on the 235 engine creates a little more pressure than is necessary to keep your Rochesters happy. I've found that the dual carb setups work well with 3-1/2 psi...whether it be Carter/Webers, Holley/Webers or the venerable Rochesters.
I found through trial and error, that with the addition of an inexpensive adjustable regulator, (Mr. Gasket-Azone) you could drop your fuel pressure which cut down on pressure on your needle and seat and also reduced leakage from the tops of the 4 screw Rochesters. It's a must on the H/W's and C/W's and seems to work as well on the Rochesters, whether singles or duals.
Note: If you add a typical filter between the regulator and the carbs, you need to increase your adjustment up 1 pound per filter. Also, the Mr. Gasket adjustable regulator has proven more reliable than the look-a-like Spectre brand regulator.
Dave | | |
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