[Diy_efi] : ask the experts #1

[Tom Sharpe]

Well spoken,  Might want to vent the return-less surge tank to the real 
tank. A little pressure in both might be good. I recommend allowing the 
fuel to heat (not too hot) - that should raise effeciency and vaporization 
as long as the system will keep the mixture correct. Of course this does 
not apply to racers - only if you are concerned w/ mileage... Smokey U. 
used to kave a twin turbo (inline) Fiero w/ 400 deg. inlet temps. great for 
efficiency but hard on valves. 

On Thu, 16 May 2002 23:20:07 -0400, Shannen Durphey <shannen at grolen.com> 
wrote :

> Pluses and minuses, like everything.
> 
> I) Surge tank design
> 
> 	A.  With return line
> 		1 simple control of fuel level in tank
> 		2 removes fuel heated by engine and replaces with cooler 
fuel from tank
> 		3 works with pumps that produce very little pressure
> 		4 purges vapors to main fuel tank
> 		5 design and mounting of tank must be very considerate of 
outside forces.
> 		6 hot soak conditions can fill surge tank and return line 
with vapor
> 
> 	B.  Without return line
> 		1 float controls fuel level
> 		2 vapors can be trapped with pressure release valve and 
recovered by vapor
> cannister
> 		3 temperature sensitive: fuel recicrulated by efi system is 
hot!
> 		4 can be less sensitive to cornering, acceleration rates.  
> 			a) only way for fuel to get "out" is through the 
high pressure pump.
> 		5 can help prevent vapor formation in LP line and surge tank
> 
> I am using a return-less reservoir in one of my retrofits.  It saved 
considerably on
> adding additional fuel lines and modifying the sending unit in tank.  I 
have not had
> trouble with fuel heating to the point of vapor lock in the high pressure 
side, but
> each application will require thought to placement of the reservoir.  
Mounting the
> reservoir away from the engine and including a small cooler on the return 
line for
> the high pressure side could help tremendously.
> 	
> Shannen
> 
> William Shurvinton wrote:
> > 
> > Hi,
> > 
> > Was having a discussion on surge pot plumbing in the case where you 
have a
> > LP pump feeding the surge pot. Consenus was that in this case the return
> > line to the tank was mainly for removing air that had gotten in and so
> > should be fitted with  a restrictor to prevent the LP pump circulating 
the
> > tank contents around every 10 minutes. Wondered if this was generally
> > considered a good or bad thing?
> > 
> > Rgds
> > 
> > Bill
> > 
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> 
> 

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