<VV> Healthy pumps?

[corvairs]

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 were 
>  solved. Hhhhmmmmm?
> Grant
>
>