Originally Posted by BloodandSoil
My car has been sitting for a while but has always started up before. I checked the entire ignition/starter system and all is working fine. I finally noticed when given gas the jets to the secondaries were working but the primaries were dry. I have a Holley 750 double pumper. Any suggestions as to why this might happen and how I can fix it???
Your help is appreciated!
A couple thoughts:
Providing the carb has fuel in the bowls (you check by removing the screws on the sides of the bowls. Do this w/the engine off, w/a rag underneath to catch the gas that might leak, and wipe up any spilled fuel before restarting), the diaphragm might have dried out and become too stiff to work the accelerator pump.
The screws in the bowl sides are also where the float level is checked.
Make sure the squirter isn't plugged up. Also, there's a check ball or short rod underneath the squirter (where the accel. pump fuel comes out), check to see that it isn't stuck. The squirters have two thin gaskets on both sides, be sure they're there and not damaged.
- Another check valve is located within the accel. pump well itself:
Check to see that there's a plastic pump cam on the primary throttle shaft, and that it has a screw in position #1 holding the cam to the linkage.
Pump cam photo (red object seen in the central portion of photo), from an article
on adjusting the accelerator pump circuit:
Be sure the adjuster provides about 0.015" clearance at WOT, but no clearance between the adjuster and the pump arm at idle. The pump adjuster is the small bolt w/a spring that loads it against the lever.