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Re: Fuel Pump and System [saabnow]
Posted by The Saab Network (more from The Saab Network) on Tue, 26 Nov 2002 22:28:23
In Reply to: Fuel Pump and System [saabnow], The Saab Network, Mon, 11 Nov 2002 22:56:34
Message from David Prantl
Subject: Re: Fuel Pump and System
=================
> The only location I could find in terms of a fuse was in position #30 on
>the fuse panel.
What are you trying to test, and is it a 900 8-valve or 900 16-valve ?
> The Haynes manual indicates the ECU is located at the kick panel on the
>passenger side, it appears that mine resides on the inside of the fender
>on the drivers side.
This would indicate that you have a 16-valve (?). The LH fuel system ECU is
indeed in the front passenger footwell, behind the carpet. The left fender
ECU is the EZK ignition ECU, or the APC (boost control) ECU if you have a
turbo.
> The fuel pump relay located, on the fender location same as the ECU,
This doesn't make any sense. The 16V fuel pump relay is above the LH ECU,
inthe front passenger footwell behind the carpet. The 8V fuel pump relay is
inside the main fuse box.
> how the position of #30 was getting power.
If fuse position #30 is indeed the correct psition for the fuel pump fuse,
then it'll be getting power on one side as follows:
16V:
from the LH fuel pump relay, which is grounded by the LH ECU only when this
ECU receives a tach signal, i.e. only while the engine is cranking or
running.
8:
from the fuel pump relay in the main fuse box, only while this relay is
receiving a tach signal, i.e. only while the engine is cranking or running.
To test the fuel pump, you do the following:
1. Identify the fuel pump fuse position.
2. Determine which side of this fuse position runs to the fuel pump in the
trunk. Call this terminal A.
3. Identify the hazard light fuse position.
4. Determine which side of this fuse position is always live. Call this
terminal B.
5. Connect a jumper wire between terminals A and B. The fuel pump should
now be receiving battery voltage on one of it's terminals, and if it's good,
you should hear the pump running. No matter what your pump setup is, you
can run it this way for as long as you want without hurting it.
Alternatively, drag a battery to the back of the car and hit the pump
terminals directly with battery power. If you have a 2-pump system (rubber
bellows around the pump), run the main pump for a short time only. If you
have a 1-pump system (round plastic panel with large screw-collar securing
it to the tank), you can run the pump this way as long as you want.
Either way, do invest forty bucks in a Bentley manual for your SAAB. It
contains many useful wiring diagrams, and better troubleshooting procedures
than the Haynes.
Best regards,
David Prantl
david_prantlno39sdcx6spamx782hotmail.com
'84 900S, 5M, 210kMi, RIP as of 2/98
'89 900, 3A, 116kMi, restored and SOLD on 3/24/01
'97 9000CSET, 5M, 63kMi, Speedparts Stage-I, SOLD on 10/11/02
'86 9000T, 5M, 200kMi
'88 9000S, 5M, 142kMi
'90 9000S, 4A, 146kMi
'93 9000CSET, 5M, 80kMi
'68 97 Sonett V4, 4M, 76kMi, #000467
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