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Date: Thu, 06 Jan 2005 00:54:14 GMT
From: th <someguynospamwhere.se>
Subject: Re: c900 1984 - One or TWO Fuel Pumps?


T wrote: > Dave Hinz wrote: > >> On Wed, 05 Jan 2005 22:00:51 GMT, T <tberknospamlobal.net> wrote: >> >>> >>> Does the 84 classic 900 sedan have two pumps? >> >> >> >> Pretty sure it does. >> > > OK, we're going with Main Pump/ Prepump setup. > >> >>> I know this particular car has a pump found in the trunk, on top of >>> the tank. I looked underneath and only saw the accumulator with it's >>> in/out lines and a vent tube to the atmosphere. It had no electrical >>> connections. >> >> >> >> That sounds like the filter? >> > > > No, I know CIS systems in general pretty good. I don't have much Saab > time though, I'm a mainly VW wrench. > Have a look at http://www.swedishwrench.com/fuelidentifer.htm where a short history of Saab fuel injection systems is given. From 1988 and onwards the fuse is the last component before the pump (the relay sits between the battery and the fuse) but IIRC the relay was the last part before the pump before that time (at least on the 99 model). I think I could use the same cable with a 99 and a 900 to start the pump manually but for the 99 you plugged the cable in place of the relay while for the '88 900 you plugged the cable into the fuse box (between a hot line and one side of the fuse). Thus if you have voltage at the fuse/relay but not at the pump the most likely cause is a bad contact inside the fuse/relay box followed by a bad contact at the pump. A broken cable is very unlikely. You can run the pump with the ignition off as the fuel flows back through a return line. The relay is mainly there for safety, in case of an acccident where the engine stops the relay prevents fuel from being pumped out of the relatively safe location of the tank. -- th

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