Quadrajet Problem Solving > Diagnose a Quadrajet carburetor problem

Dual capacity accelerator pump

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cobalt327:
I want to use a 1985 Q-jet 17085292 (NON CCC/NON computer controlled), but it has the solenoid for the dual capacity accelerator pump. Will the accelerator pump work "normally" w/o the solenoid operational? What I mean is, is the default accelerator pump position the normal pump shot or the decreased pump shot?

And finally if the pump shot is "normal" is this basically the same as a non dual capacity pump shot?

Great to see there's now a "basic" rebuild kit available w/the same quality as before! I've recommended them already at the Hotrodders.com forum.

Thanks, Mark

Cliff Ruggles:
We remove the valve under the solenoid and fill that cavity with molten lead when building those here.  They work just like standard units at that point. 

One could just leave the solenoid unhooked, as the valve is closed, but we like to block off the entire system in case there is a leak at the valve.....Cliff

cobalt327:
I'm wondering if there might not be something to retaining the function of the dual capacity accelerator pump.

My thoughts are to make the mods to gain pump shot volume (if/when needed), but to have the solenoid wired through a coolant temperature switch for a reduced pump shot under 'normal' driving conditions. Then have it also wired through a toggle that could be used to disarm the solenoid for track use.

Does this sound feasible, providing the reduced pump shot was found to be enough for normal driving?

Thanks, Mark

Cliff Ruggles:
Most applications (high performance) are going to want improved pump shot with quick/heavy throttle movements.  This covers any potential lean spots till the main system is fully on line.  The only way one would know if it would like less fuel in these conditions for any particular application, would be to test it.....Cliff

73 Z28:
That is an interesting idea to be able to switch the dual capacity fuel pump feature on and off as needed for performance use or daily driving.......hmmm may have to hunt up one of those carbs to play around with.

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