carb problem?????
I replaced my quadra jet with the Holley replacement carb.(I know what some might think of the switch). The problem i am having is that if i let the car sit for 6 or 7 days after taking it out it seems like the carb needs to refill its self. But if it just sits for a day or 2 it is ok.Any thoughts?Thanks
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Re: carb problem?????
Well, I don't know if this is an answer to your question:
when I don't drive my (orig. Rochester Q-Jet equipped) 77 for some time (a couple of days) the fuel bowls tend to empty (fuel just evaporates - especially when I park the car hot in the garage) just as well...
So maybe you simply do not have a problem!
Just remember to depress the gas pedal once or twice prior to starting your engine to refill the bowls... -
Re: carb problem?????
Fuel bowls emptying is an issue for both Holley and Rochester. I don't have a solution for either of you, although Q-jets are prone to leak around the plugs in the bottom. The fuel leaks into the intake. The solution is to epoxy the plugs in place.
I never did find a solution for my Holley loosing fuel. I took to filling the primary fuel bowl through the vent tube from a plastic squeeze bottle. The lack of fuel on start up was an advantage when starting after a long storage. I cranked the starter until the oil pressure comes up. Then fill the primary bowl and she fires right up.TerryComment
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Re: carb problem?????
Same with me - I do not really consider this a problem, hardly a "nuisace".
You easily get used to the procedure of giving it a crank, then pump the bowl and here she goes...Comment
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Re: carb problem?????
Almost all carbureted cars have the same problem. My 63 with an Carter AFB is one of the worst, only it isn't evaporation on mine - it's percolation during hot soak after shut down.
All these problems are made more acute today due to the 10% alcohol in the gas. This isn't a concern on cars with closed (unvented) fuel delivery systems and with modern fuel injection. Big brother and the market have mandated a situation that is almost intolerable for our old Vettes. For the first time in 45 years I am thinking about getting rid of my car. The fuel vapors in my attached garage along with the potential for hydraulic lock in the engine are so bad I feel like I'm dealing with a bomb waiting for a time to go off.
I too use the long crank after shut-down routine.
Stu FoxComment
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Re: carb problem?????
on Q jets that have a return line to the tank from the fuel pump need to have a check valve fuel filter in the Q jet to prevent the fuel bowl from emptying back into the fuel line because the fuel inlet is below the needle/seat in the carb. the Q jets with the windowed needle/seat which most corvette have will almost empty the bowl. as the gas starts to evaporate from the float bowl the float drops and opens the needle/seat and the fuel runs out. the holley uses a different setup on the needle/seat which is above the fuel level.Comment
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