fuel problem

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J

jerry gillilan

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pleasantville ohio
i have a 1970 plymouth duster with a 340 ci the engine has been majored bored 030 over forged pistons oe cam part#4120233 292 duration 508 lift the original carter avs was overhauled and installed after timing was set i kept getting fuel dripping from vacuum boosters so i removed and installed a six pack set up that i had same problem i sent the six pack to promax carbs they went thru and set uo on their test cell engine installed on my car same problem checked float level needle and seat on both set ups is it possible that cam is causing problem thanks
 
What fuel pump are you running, Whats the fuel pressure ? I hook a fuel pressure guage up and make sure its not to high. Usually anything more then 7psi at idle will flood the carb. I had a chrome Holley pump that did this. It was putting out 9psi at 800rpms.

If your pressure is to high just add a regulator.
 
To get that to idle with that big cam, you have opened the throttle so you are into the main circuit, not the idle circuit. If it was a holley or demon 4 barrel you could just crack open the secondary butterflies a half turn or so. With the avs you'll probably have to drill a small (1/16") or so hole in each secondary butterfly. You might have to go bigger but try that first.

don
 
i fogot to mention that i have installed a fuel regulator and have the pressure adjusted between 4.5 and 5psi still no difference the fuel pump is a standard mech. pump
 
dusterdon said:
To get that to idle with that big cam, you have opened the throttle so you are into the main circuit, not the idle circuit. If it was a holley or demon 4 barrel you could just crack open the secondary butterflies a half turn or so. With the avs you'll probably have to drill a small (1/16") or so hole in each secondary butterfly. You might have to go bigger but try that first.

don
Click to expand...


thats it...
 
Having to open your throttle plates too much can also cause a tip in hesitation. There are "transfer ports" (side ways slots that are revealed when throttle is slightly opened. There are there to provide enrichment when you come off idle. With the plates already into or past them, there is no enrichment provided other than acell pump. Sometimes it causes a problem and sometimes it doesn't.

Brian
 
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