Date: 5 Jan 2005 22:25:26 GMT From: Dave Hinz <DaveHinznospamcop.net> Subject: Re: c900 1984 - One or TWO Fuel Pumps?
On Wed, 05 Jan 2005 22:17:34 GMT, T <tberknospamlobal.net> 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. That's what I'm thinking, but '84 is a gap in my ownership history. I'm driving an '86 right now though which is pretty close. >> 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. Almost completely surely, your experience will carry you then. > 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. Ah, there. Yeah, the filter is probably closer to the front of the car, and looks, well, filter-like. Beer can type thing with the usual banjo fittings & a hex on one end, held to the body with the clamp that you'd expect. >> 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. Do you have a wiring diagram for the '84? If not, let me know and I can take a look for you. The Bentley manual should have what you need, if not I have the full set of c900 shop manuals. >> 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. Was the old one known bad, or was this just a "let's eliminate that from the equation" step? > 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.) Well, you could have no voltage there because it's shorted, but then you'd have a fuse blown somewhere. Something isn't adding up here just yet. Dave Hinz
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