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Buick Fuel/vacuum pump: air dome question


kgreen

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It is the same function as a water hammer snubber for home water piping. It absorbs fuel line shock related to rapid changes in fuel demand.

It can be located on the pump as part of the upper casting, or on the pump outlet line. 

Be sure to inspect the valve inside, and note the spring is very delicate and has a low spring force so it can be as responsive as possible to rapid changes to the fuel demand.

 

Its low maintenance, especially if you run non oxy fuel.  Inspect more often if you are running reg unleaded with gummy ethanol.

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From a 2014 post, Here is the function of the air dome.  I wonder if Olds88_1956 is still active on the forum?

 

The air dome aids in preventing the fuel pressure from "hammering" when the carb float closes. Just like the ones in house plumbing!

Hope this helps,

Olds88_1956

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Just now, 32buick67 said:

It is the same function as a water hammer snubber for home water piping. It absorbs fuel line shock related to rapid changes in fuel demand.

It can be located on the pump as part of the upper casting, or on the pump outlet line. 

Be sure to inspect the valve inside, and note the spring is very delicate and has a low spring force so it can be as responsive as possible to rapid changes to the fuel demand.

 

Its low maintenance, especially if you run non oxy fuel.  Inspect more often if you are running reg unleaded with gummy ethanol.

 

You posted as I was also entering, thanks a million for responding!

Ken

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