Date: Wed, 05 Jan 2005 22:17:34 GMT From: T <tberknospamlobal.net> Subject: Re: c900 1984 - One or TWO Fuel Pumps?
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. Under the car, right by the tank, right near the wheel is a fuel accumulator. It has a diaphragm and a spring inside it's job is to provide _some_ pressure to avoid the equivalent of vapor lock. > >>Might it be likely that the main pump is forward of the rear wheels? >>The situation right now is I am getting 12 to the two places that feed >>the pump relay up front. I am NOT getting 12v to the pump I find in the >>trunk, on top of the tank. > > > I think that's called the "pre-pump". You need voltage there or you'll > get... > Yep, I get 12v at the relay in the engine bay but no 12v back at the prepump. > >>Car cranks over, gets spark, gets NO fuel pressure. Car just stopped >>running in the middle of the street. > > > ...yeah, that. > > Have you checked fuses and/or relays marked fuel pump? > Now, one thing to add; I didn't jumper around the relay and I did find and replace a 25 or 30 amp fuse for the pump. It has a known good fuse right now. What I might do next is jumper the Hot 12v to the fuel pump feed to see what happens. (At one point I put a battery charger's 2A/12V feed to that pump and it didn't seem to do anything so maybe I have multiple problems.) TBerk
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