<VV> Healthy pumps?

[corvairs]

Ron - If the valves do not allow "cycling" then the system could 
continue to build up pressure until you had a failure. The pumps are 
designed to "cycle" (that is re-circulate gas without pumping out) when 
excessive pressure is obtained. Now, we DO know that a return line was 
offered on mid 63-66 turbos because, when under boost, it was possible 
to essentially "overcome" the pumps intended design. (Keep in mind that 
the turbo carb has one little float rather than 2) But none of these 
factors have ANYTHING to do with the internal spring in the pump. That 
spring exists solely for the purpose of making sure that the pump 
diaphram  follows the crankshaft eccentric. It has NOTHING to do with 
the pressure the pump puts out.       Lon

www.corvairunderground.com


Ron wrote:
> The float valves turn the flow on and off.  The fuel pump provides a design 
> pressure whether it's on or off.
> RonH
>
> ----- Original Message ----- 
> From: "corvairs" <corvairs at pacifier.com>
> To: "Jack Kean" <jkean at sbcglobal.net>
> Cc: <virtualvairs at corvair.org>; "Frank DuVal" <corvairduval at cox.net>
> Sent: Thursday, July 17, 2008 1:17 PM
> Subject: Re: <VV> Healthy pumps?
>
>
>   
>> Jack - This current hysteria about fuel pump pressure is an internet red
>> herring.  Mechanical pumps have put out that kind of pressure all along.
>> (or at least, it is within range). Are you having problems that have
>> lead you to look at pump pressure?  By the way (to you guys who said
>> that the valves don't regulate the flow of fuel under pressure) how then
>> does the stock Corvair system "shut itself off" (stop fuel flow) when
>> the carb bowls are full or when the secondaries are closed?    Lon
>>
>>
>> www.corvairunderground.com
>>
>>
>> Jack Kean wrote:
>>     
>>> I inserted a fuel pressure gauge in the fuel line, in place of one of
>>> the secondaries in my 140 hp yesterday. It was registering around 8
>>> pounds at idle, 9 pounds per square inch off idle. Seems at least double
>>> the numbers listed in the shop manual. I am not sure of the source of
>>> this mechanical pump, since it was on the car when I purchased it. I
>>> will be looking into a fuel pressure regulator, which I will be able to
>>> continue to use if I chose to change to an electric fuel pump.
>>>
>>> jack kean
>>>
>>>
>>>       
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