<VV> Fuel Pressure WAS looking to buy a spare fuel pump

[Ken Pepke]

Hi Lon:
As you said, those suggesting cutting the spring are 'creating an all new superstition involoving fuel pumps.'  On the other hand, they may have been trying to solve a low fuel delivery problem caused by a weak spring so cutting off some of the wire might have helped ... Maybe not.  They did not specify their problem. So far, nobody has made mention of a spring supplier.

Perhaps I should not have suggested replacing the spring as a way of regulating fuel pressure even though it is a legitimate method.  A softer spring will, in fact, lower the fuel pump maximum out-put when that is the cure needed.  A 'harder' spring will supply fuel at a higher pressure in instances when top end high performance is hindered by insufficient fuel delivery.

Ken P
Wyandotte, MI
Worry looks around; Sorry looks back, Faith looks up.

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> From: "lonwall at corvairunderground.com" <corvairs at pacifier.com>
> Date: March 30, 2012 3:02:40 PM EDT
> To: virtualvairs at corvair.org
> Subject: Re: <VV> Fuel Pressure WAS looking to buy a spare fuel pump
> 
> Ken - Your first paragraph hits the nail on the head. All the folks who 
> lately have suggested cutting coils out of their return spring are 
> creating an all new superstition involving fuel pumps.
> 
> But why then your second paragraph?????
> 
> Lon wall
> www.corvairunderground.com
> MARCH SALES END SATURDAY
> 
> 
> 
> On 3/30/2012 5:50 AM, Ken Pepke wrote:
>> The stock Corvair fuel pump has a pressure regulator 'built in' in the form of the diaphragm return spring.  The pump flows fuel and when the supply exceeds the demand the resulting pressure compresses the spring and lifts the push rod off the cam follower.  That reduces or stops the pumping action until the demand calls for more fuel.
>> 
>> The question becomes does anyone offer 'softer' or 'harder' springs to tailor the pump more closely to the demand?