[Diy_efi] Fuel pump run time with key on

[Lee M. Lemoine]

Just FYI, all GM cars will turn the fuel pump on once 10 psi of oil
pressure is established, so that the "limp home" module will work (the
ESC module runs spark, starting automatically at 400 rpm, and just
never passes it off to the main ECM...   and the ECM does basic fuel
management on preloaded tables)...   Anyways, so, the bottom line is
that yeah, your ideas perfect, but will be redundant in this case, as
10 psi usually is there almost instantly on those motors, the oil sump
was exceptional on the 3.4 (and i used it on my 3.1 turbo during the
rebuild)

BTW:  I found a diagram of the fuel pump for my Cavalier stock, i know
the grand prix isn't far off...  i believe its piece #5 on this
diagram "Dampener"

http://s117450979.onlinehome.us/help/Fuel%20pump%20wiring.gif


On 8/22/05, Jim Bannister <jimster1 at earthlink.net> wrote:
> How about this really simple approach, run a lead from the starter soleno=
id
> to the fuel pump through a diode, this will run the pump any time the eng=
ine
> is cranking.
> Jim b.
>=20
> -----Original Message-----
> From: diy_efi-bounces at diy-efi.org [mailto:diy_efi-bounces at diy-efi.org] On
> Behalf Of Becker, Damon (Damon)
> Sent: Monday, August 22, 2005 12:56 PM
> To: diy_efi at diy-efi.org
> Subject: RE: [Diy_efi] Fuel pump run time with key on
>=20
> Since you are stuck on not fixing the problem hydraulically (correct
> valve in pump), you could have a fuel pump switch in parallel with the
> relay that would hold the pump on just before cranking.  This way, you
> switch on the pump, fire up the car, then turn off the switch.  This
> would give you the quick, easy start that your starter will thank you
> for in the future.
>=20
> -----Original Message-----
> From: diy_efi-bounces at diy-efi.org [mailto:diy_efi-bounces at diy-efi.org]
> On Behalf Of Adam Wade
> Sent: Monday, August 22, 2005 1:48 PM
> To: diy_efi at diy-efi.org
> Subject: Re: [Diy_efi] Fuel pump run time with key on
>=20
> --- Ben <sappyse107 at 60degreev6.com> wrote:
>=20
> > So is there a setting in the computer for the pump to run a set amount
>=20
> > of time?
>=20
> I don't know about your particular ECU, but that is typically how it is
> done -- key-on runs the fuel pump for a set amount of time and then
> stops.  If there is a variable somewhere that the ECU "looks up", then
> it should be simple to increase the time period during which the pump
> runs.
>=20
> Doesn't the pump come back on during cranking and raise the rail
> pressure again, though?
>=20
> | Honda GL500 Interstate (Slug)    Kawasaki Zephyr 550 (Daphne) |
> | "It was like an emergency ward after a great catastrophe; it  |
> |   didn't matter what race or class the victims belonged to.   |
> |  They were all given the same miracle drug, which was coffee. |
> |   The catastrophe in this case, of course, was that the sun   |
> |     had come up again."                    -Kurt Vonnegut     |
> | M/C Fuel Inj. Hndbk. @ Amazon.com -  http://tinyurl.com/6o3ze |
>=20
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--=20
Sincerely,

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