[Diy_efi] Fuel pump run time with key on

[Lee M. Lemoine]

One last note here:   It's been awhile since i've looked at it,
however, i believe the 'swirl pot' as its called, (or the plastic case
that the fuel pump is mounted in) is where the fuel return line runs. 
 I don't honestly remember a  hose connecting to it though.   What
would ideally work would be a anti-siphon springvalve..   (I know they
make these in larger diameters because we use them all the time in
below-grade swimming pool plumbing repairs so that the pump doesn't
flood whenever we open the system... )    Basically its just an inline
checkvalve with a spring pre-tensioner on one side preventing the
valve from opening until (a selectable) pressure is reached in the
line.   say 5 psi, 10 psi, whatever.   You could probably grab this
line under the rear seat near the fuel filter area, if you wanted
to...  on the rubber portion, and splice one in -- and put one in
somewhere near your fuel filter in the other direction, and that'd
take care of your fuel lines.

Now you'd have one-way valves and a pressure / flow requirement before
they'd open preventing draindown.

http://doityourself.com/store/2158004.htm   quick idea of what i'm
talking about on the PVC end of things w/ swimming pools....

On 8/23/05, Mike <niche at iinet.net.au> wrote:
> At 04:10 AM 8/23/05, you wrote:
> >2 seconds doesn't cut it after its been sitting all night. It has to pump the air out of the lines first before there is any fuel pressure, so I need it on for about 10 seconds.  You can hear when its ready to fire from the fuel pump whine changing as pressure builds.
> 
> What air ? How does air get into the system, is the fuel return line
> at the top of the tank, hence siphoning air back ? If the swirl pot outlet
> is in the correct place at the bottom then no air will get in unless your
> tank is always really empty... Os the fuel pressure regulator leaking
> air back in when system depressurises ?
> 
> >Yes, im set on not dropping the gas tank again unless the pump dies.
> 
> Something is not right about the physical side. My ECU runs the pump
> for 5 seconds during cranking, there is *no* way air can get into the
> system even if the pump's inherent one way valve is faulty. The fuel
> return is at the bottom of the tank therefore also cant get air back in...
> 
> >I haven't found any variables for the pump though, which is why I was asking if there is such a variable in any of the computers, so I know what to look for.
> 
> If the factory setting is 2sec then it should be fine assuming the mechanical
> side is up to scratch, is it possible the fuel return has broken off inside the
> tank so it can let air back in ?
> 
> 
> 
> Regards from
> 
> 
> Mike
> Perth, Western Australia
> VL Commodore Fuse Rail that wont warp or melt !
> Twin tyres for most sedans, trikes and motorcycle sidecars
> http://niche.iinet.net.au
> 
> 
> 
> 
> 
> 
> >Ben
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-- 
Sincerely,

Lee M. Lemoine
http://www.turbochargedsoul.com/