<VV> Healthy pumps?

[corvairs]

Frank, I would be inclined to think that if the spring was made 100 
times stronger then it still wouldn't matter because of the 
self-regulating mechanism in the pump. Lon

www.corvairunderground.com


Frank DuVal wrote:
> Ahha, but the spring is the source of fuel pressure. Put in a heavy 
> spring and the pressure will be too much. That is why just changing the 
> spring in the second case worked.
>
> I ran into this first over 30 years ago on a pump for a Wyllis Jeepster. 
> Three used pumps to chose form, one too weak ran out of fuel above an 
> idle), one waaay to strong (flooded out the top cover/vent) and one just 
> right. I took them apart to see and the spring tension was noticably 
> different.
>
> Frank DuVal
>
> corvairs wrote:
>
>   
>> Grant - The design of the mechanical fuel pump for the Corvair makes 
>> this kind of impossible, unless someone is making/selling a version of 
>> the pump that I have never heard of.
>>
>> It's a simple design that is intended to "cycle" (that is, not pump gas) 
>> when a minumum amount of back pressure is encountered. If you look at 
>> the internals you can see that the pump has no other way of determining 
>> when to push fuel or not. And the demand for fuel constantly changes.
>>
>> I would look elsewhere for the cause of the problems.
>>
>> Lon
>> www.corvairunderground.com
>>