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Holley 770 Super Stock Carb problem

Posted By: Sammy

Holley 770 Super Stock Carb problem - 09/19/19 11:04 PM

Cant get the squirters to work on a OE magnesium crossram on my Hemi Dart.
I changed the accelerator pumps on both carbs.
Poured a little fuel into carbs and car starts right up.
Runs fine but the accelerator pumps dont work.
I put in OE Holley accelerator pumps too.
What am I doing wrong?

They worked initially the 1st day I put them in but 5 days later they dont work.
Posted By: fbs63

Re: Holley 770 Super Stock Carb problem - 09/19/19 11:11 PM

Did the bowls have check balls or the rubber check flap in them?
Posted By: fast68plymouth

Re: Holley 770 Super Stock Carb problem - 09/20/19 12:46 AM

I’m going with........ the check needles(under the squirters) are either stuck or missing.
Posted By: Sammy

Re: Holley 770 Super Stock Carb problem - 09/20/19 02:22 AM

Originally Posted by fast68plymouth
I’m going with........ the check needles(under the squirters) are either stuck or missing.



How do I get to them?
Not familiar with these carbs.
Posted By: Cab_Burge

Re: Holley 770 Super Stock Carb problem - 09/20/19 05:47 AM

The accelerator pump squirter is mounted between the front two barrels inside the front half of the carb, it is held in with a large Phillips head screw that is hollow to allow fuel to squirt up through it into the carb. The check valve is under the squirter. Remove the screw and squrtier without loosing either gasket and then roll the carb over a clean flat surface to see if the check valve or check ball will drop out scope Most Holley carbs have a square brass check valve that has a tapered point on it that sits on a machine seat in the carb body to stop the gas flow from siphoning after the accelerator pump is done squirting fuel into the carb. scope If it won't drop out hold the arb upside down and tap on the bottom of it gently several times to see if it will jar loose and drop out luck wrench
Posted By: krautrock

Re: Holley 770 Super Stock Carb problem - 09/20/19 01:29 PM

the brass check valve looks like this...

https://www.ebay.com/itm/Holley-Acc...-BG-AED-QFT-Sold-as-Pair-2-/173151568496
Posted By: GomangoCuda

Re: Holley 770 Super Stock Carb problem - 09/23/19 05:37 PM

All good info above but there is another possibility. A long time ago Someone asked me to look at a Holley that they rebuilt and had problem with the accelerator pump. Turned out the bowl gasket only had one hole for the accelerator pump passage and yes of coarse the gasket was backwards, perfectly blocking the passage.

Just remembered a brand new carb with a doa accelerator pump. The nozzle screw was pushing the check valve into it's seat. Screw was defective. Simple fix.
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