REFLECTOR: Fuel Selector Valves

[Scott Derrick]

I just talked with an A&P/IA friend of mine.

He thought  the bubbly fuel return should be done at the top so you 
don't inadvertantly pump bubbles into your fuel supply tube.  I would 
think keeping the return well above the supply even if it was submerged 
would be fine. Having them at the same level may invite trouble.

He also said that 210's and 206's had a bad problem in the early 70's 
with the fuel return heating up the small 1/2 gallon sump tanks they 
had(one for each main), and that there were many incidents of vapor 
lock. They had two sumps and the cure for a while was to switch to the 
cooler unused sump if you experienced vapor lock.  He though the large 
4+ gallon sumps some V's have would have no problem at all. He wasn't 
sure about a sump nearer a gallon in size.  I don't know how big the new 
sump tanks against the firewall are..

Scott

Scott Derrick wrote:

> Wayne wrote:
>
>>     Important: The excess fuel returning  from the fuel rail bubbles
>>     like crazy when it escapes the regulator at the end of the line.
>>     These bubbles have enough sufrace tension to partially block a 1/4
>>     inch vent line. During my test stand days I filled the top 4 or 5
>>     inches of  my sump tank  with gaseous fuel. I used an over size
>>     vent line for the first foot  out of the tank. That allows the
>>     bubbles to burst and the sump remains full of liquid fuel.
>>
> Do you think it would be a good idea to have the return line submerged?
>
> Scott
>
>
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