<VV> Healthy pumps?

[Frank DuVal]

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
>
>Grant Young wrote:
>  
>
>>This has happened twice in the last month or so, and with no desire to start a long discussion on the virtues of various fuel pumps, I will simply share the concern, as it has cost me about $50 in postage to determine the cause. I had a couple of customer concerns about some newly rebuilt carbs dripping gas and running too rich. The problem was very bad at idle and annoying when driving, as the cars would often shut off and be hard to start when at a stop light, etc. I went through one pair at my expense and found no issues. I sent another customer a pair of replacement floats at my expense, but neither solution worked. I suggested a fuel pressure check might be in order, as both customers coincidentally had new replacement fuel pumps. To make a long expensive story short, both pumps were putting out too much pressure. One was replaced by the original pump (after trying a second new one) and another owner swapped the spring from the old pump to the new, and the problems wer
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> e 
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>> solved. Hhhhmmmmm?
>>Grant
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