what did i do wrong???

Wed Sep 19 03:02:24 GMT 2001

This is a multi-part message in MIME format.

------=_NextPart_000_059D_01C1408D.34051800
Content-Type: text/plain;
	charset="iso-8859-1"
Content-Transfer-Encoding: quoted-printable

i have a '94 Z28 that i removed the factory fuel pump from (welded a =
fitting in the bottom and run a gravity feed external pump)... i left =
the sending unit in there so the gauge would still work... when i first =
turned the key to "on" (but didn't crank it over) the fuel gauge looked =
correct - 1/4 tank... then when i started the car it started swinging =
back and forth (E -> F -> E)... now it just stays stuck at way past =
full...=20

i looked at the schematic and it shows that a cap was in parallel with =
the fuel pump and that the fuel pump shared a ground with the variable =
resistance sending unit (0-90 ohm)... so i figured the voltage coming in =
to the fuel pump circuit was the problem (not sure how, but i reasoned =
that i had an RC circuit that was oscillating and that's what i was =
seeing on the gauge)... i cut the fuel pump power wire, but now the =
sending unit circuit reads 15M ohm and the gauge is pegged.... it's a =
MAJOR pita to get this tank in and out so i don't want to go through too =
many iterations of this... what did i do wrong to burn this thing up and =
should it be ok next time if i have the fuel pump circuit disconnected?

thanks,
jeff

------=_NextPart_000_059D_01C1408D.34051800
Content-Type: text/html;
	charset="iso-8859-1"
Content-Transfer-Encoding: quoted-printable

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META http-equiv=3DContent-Type content=3D"text/html; =
charset=3Diso-8859-1">
<META content=3D"MSHTML 6.00.2600.0" name=3DGENERATOR>
<STYLE></STYLE>
</HEAD>
<BODY bgColor=3D#ffffff>
<DIV><FONT face=3DArial size=3D2>i have a '94 Z28 that i removed the =
factory fuel=20
pump from (welded a fitting in the bottom and run&nbsp;a gravity feed =
external=20
pump)... i left the sending unit in there so the gauge would still =
work... when=20
i first turned the key to "on" (but didn't crank it over) the fuel gauge =
looked=20
correct - 1/4 tank... then when i started the car it started swinging =
back and=20
forth (E -&gt; F -&gt; E)... now it just stays stuck at way past full... =

</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2>i looked at the schematic and it shows =
that a cap=20
was in parallel with the fuel pump and that the fuel pump shared a =
ground with=20
the variable resistance sending unit (0-90 ohm)... so i figured the =
voltage=20
coming in to the fuel pump circuit was the problem (not sure how, but i =
reasoned=20
that i had an RC circuit that was oscillating and that's what i was =
seeing on=20
the gauge)... i cut the fuel pump power&nbsp;wire, but now the sending =
unit=20
circuit reads 15M ohm and the gauge is pegged.... it's a MAJOR pita to =
get this=20
tank in and out so i don't want to go through too many iterations of =
this...=20
what did i do wrong to burn this thing up and should it be ok next time =
if i=20
have the fuel pump circuit disconnected?</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2>thanks,</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>jeff</FONT></DIV></BODY></HTML>

------=_NextPart_000_059D_01C1408D.34051800--

----------------------------------------------------------------------------
To unsubscribe from diy_efi, send "unsubscribe diy_efi" (without the quotes)
in the body of a message (not the subject) to majordomo at lists.diy-efi.org