[urq] urq Digest, Vol 77, Issue 35

[qshipq at aol.com]

I agree with Peter, cavitation can be addressed before or after the pump.  Actually anywhere between the tank and the fuel rail.  This 'fuel capacitor' concept certainly can be mounted before the pump as Ben did it, but every HP application of this concept I've seen, is in the engine bay, regardless of pump location.  I would surmise the reason for this more common application, is less of a need to modify fuel tanks, fuel line diameter, and/or the risk of hanging a secondary fuel bomb under the car.

Scott J


-----Original Message-----
From: Peter <audionly at gmail.com>
To: Cody Forbes <cody at 5000tq.com>
Cc: <urq at audifans.com> <urq at audifans.com>; Quattro List <quattro at audifans.com>; Mike Del Tergo <mdeltergo at hotmail.com>
Sent: Sun, Mar 28, 2010 3:02 pm
Subject: Re: [urq] urq Digest, Vol 77, Issue 35


A modified version of this is used in  hi HP engines where a 1 ltr. aluminum
canister (about the size of a tennis ball can) with a perforated membrane
about 3/4 from the top with 3 outlets on top; 1. Inlet from primary tank
(transfer) pump, 2. Outlet for return back to tank and 3. Inlet from return
of fuel rail. On the bottom of the canister are two outlets. 1. About 1' up
from bottom is an outlet that goes to a booster pump and then to fuel rail.
2. On bottom is a drain valve for sediment and water. All of this is located
in engine bay (away from heat) and assures that the only time fuel is
returned to the fuel cell is when the canister is completely full of fuel;
thus eliminating the cavitation that is being discussed here. /pc
.
On Sun, Mar 28, 2010 at 12:53 PM, Cody Forbes <cody at 5000tq.com> wrote:

> But the feed to the pump from the fuel tank is too small at 3/8". The
> new canister would have a larger outlet to feed the pump. Since all of
> the return flow goes to the small canister the fuel tank would only
> need to replace the fuel that the engine consumed which the 3/8" pipe
> could handle easily. As stock the 3/8" feed must supply not only the
> fuel that the engine uses, but also all of the fuel that the return
> line dumped back into the tank.and
>
> -Cody (mobile)
>
> On Mar 28, 2010, at 2:26 PM, Mike Del Tergo <mdeltergo at hotmail.com>
> wrote:
>
> > I'd think there would need to be more to it?  Ben already has a 23
> > gallon "canister" just inches from the pump?!
> >
> >
> >
> > > From: Cody Forbes <cody at 5000tq.com>
> > > Subject: Re: [urq] More Weird UrQ Behavior - fuel starvation
> >
> > > 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.
> >
> >
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