General Category > Quadrajet Carb Talk and Tips

17085226 - What do I have here?

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Kenth:
1985/86 Q-jets in U.S. Trucks have dual capacity pump like this 17085226, which is NOT a Computer Control Carb.
When engine is cold, more fuel is needed for transition from idle to part-throttle.
When engine is warm less is required.
Dual pump solenoid is activated by coolant temperature sensor.
AT 170 °F pump solenoid energizes, dual capacity pump valve opens and pump capacity reduces by about one-half.

Just unhook the connector and it will work just fine like any M4 Quadrajet.

Cliff Ruggles:
I would also block the passage under the plunger valve assembly.  Most of those valves are leaking, matter of fact I never tested on yet that wasn't.  Since it's not needed just fill the passage under it with lead, smack it gently with a flat punch, and build it just like any other late model SMAB Q-jet......

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