[urq] More Weird UrQ Behavior - fuel starvation

[Cody Forbes]

That's like saying you can solve traction problems by installing a  
smaller turbo ;-)

In Bens case no. His car is making enough power that he needs the flow  
capacity of the big pump. The solution is to increase the fuel flow to  
the pump.

My idea for a possibly cleaner solution was a quart or so capacity  
canister between the pump and the tank with the fuel return emptying  
in to the little tank. You'd want the return entering radially along  
the side so it swirls in to help separate any possible air bubbles.

-Cody (mobile)

On Mar 28, 2010, at 12:32 PM, Ingo Rautenberg  
<ingo.rautenberg at gmail.com> wrote:

> Could the solution be to (gasp) install a lower pressure pump  
> instead, due to the considerably lower EFI fuel pressure  
> requirements, which should lead (theoretically) to less cavitation  
> as well?
>
> Ingo
>
>> On Mar 28, 2010 12:18 PM, "Cody Forbes" <cody at 5000tq.com> wrote:
>>
>> When it comes to fuel pump output flow is inversely proportional to
>> pressure. When you decrease the pressure that the pump has to work
>> againt you increase the volume of fuel that the pump moves. Since the
>> engine is using basically the same amount of fuel you end up with  
>> more
>> volume being returned to the tank.
>>
>> This is why the fuel pump that is stock on a 5000tq, designed to work
>> at almost 100psi, is the fuel pump of choice for racers and high
>> performance street cars everywhere. When used in EFI systems the flow
>> rate of this Bosch 040 (or 044 in out of tank version) pump is one of
>> the highest flow pumps on the market.
>>
>> http://www.boschfuelpumps.com/ for specs.
>>
>> -Cody (mobile)
>>
>> On Mar 28, 2010, at 11:16 AM, Grant Lenahan <glenahan at vfemail.net>
>> wrote:
>>
>> > OPK, so it sounds like ( for mysterious reasons) that the EFI
>> > systems have a higher proportio...
>>
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