<VV> Re: pump location

[djtcz at comcast.net]

http://www.mcnallyinstitute.com/02-html/2-7.html

http://www.pumpworld.com/troubleS2.htm

Pump cavitation is almost always an intake problem.
Inlet piping too small, too long.
The stock system works OK with the pump over 6 feet away, but add some tank restriction and you may cross the line.  So rather than blaming the pump location, I'd suspect an inlet obstruction or cracked line, and check for decent gravity flow to the pump inlet, and no leaks between pump and tank


> 
> Hi, 
> 
> I can accept that pumps do a better job of pushing than pulling (but I'd 
> still like to know why) but what little I remember from my fluid dynamics 
> courses at university was that pressure drop for a given fluid is primarily 
> a function of pipe cross section and length, not whether you are pushing or 
> pulling the fluid. That was why I was at a loss to understand why pump 
> location mattered. 
> 
> BTW, thanks to everybody who responded! Best guess now is that it is a fuel 
> problem and the most likely source is the location of the fuel pump since 
> everything else is new. Tonight I'll relocate the pump. 
> 
> Many Thanks! 
> Bob 
>