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Date: Sat, 28 Jun 2003 18:13:07 GMT
From: Paul Halliday <pjghnopsamyonder.co.uk>
Subject: Fuel Over-Pressure Switch Questions


Hi guys and gals, How exactly does the fuel over-pressure switch fit together? Which bit it is? Follow me through here ... I was doing some basic boost tests this morning and "borrowed" the vac line connection that goes to (what I thought was) the fuel over-pressure switch for a graduated gauge. When I reconnected the electrical connection to the APC solenoid, I went for another test run. Whooeee! What a blast! Until ... THUNK. The fuel over-pressure switch activated at just short of 1 bar. I thought I was using the vac connection that goes to the switch, so I was surprised that it was still working unless I had fallen foul of some APC shutdown? Doubtful though. What's going on? If there is no vac/boost feed to the switch how does it know what pressure it is, unless I am not looking at the over-pressure switch. I thought the switch was one device, but there appear to be two devices in the foot well fed from the same vac line. Here's what I have: From the engine bay, there is a vac line that comes through into the LHS footwell. This has a Y junction with two short vac lines. One goes to some kind of device that has no other vac input or output and two electrical contacts on the other end of it. It's black and about 1.5 inch long and perhaps 30-35mm diameter. The other short pipe goes to another device with three electrical terminals (only two are connected) and another vac pipe comes out of that device and runs along to the dash boost gauge. This device is silver and slightly larger than the above. I have my dump valve and shortly I will have an uprated wastegate actuator fitted and I really want that 1 bar boost :) Now I've reconnected all the vac lines as they were, 0.6 bar seems so boring :( What do I do to disable the switch? Do I need to find the vac line that connects to the dash boost gauge and connect that directly with the vac line that runs from the engine bay? This will leave both devices I mentioned without vac feeds. What about the wiring? Is it a simple matter of getting a short wire with blade terminals of the right size and simply plug both terminals together on both devices? Your experience and advice will be very much appreciated and will stop my head hurting. Paul 1989 900 Turbo S http://saab.go.dyndns.org/

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