Date: Sun, 9 Jan 2005 04:58:37 +0000 (UTC) From: Craig's C900 Site <c900nospam.apana.org.au> Subject: Re: c900 1984 - One or TWO Fuel Pumps?
T <tberknospamlobal.net> writes: >Does the 84 classic 900 sedan have two pumps? Not as such. The 83-1/2 and up C900's have fuel pumps that are configured differently and have a 'supply pump' which primes the main pump via an encapsulating fuel reservoir which keeps the main pump primed more efficiently. The whole thing operates as a sealed unit and it's the only part of the fuel tank assembly which is pressurised. The fuel tank is fully-pressurised on earlier models (such as my 1982/83 900S) which has the older style of pump. >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. >Might it be likely that the main pump is forward of the rear wheels? Is the car fitted with a turbo? I've heard of extra fuel pumps being added (not in Saab's) where turbo's are fitted as a way to run with higher fuel pressures. >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. Can you trace the wiring back to the fuse/relay block and run a continuity test on the power supply to the fuel pump from the fuel pump relay? Can you get the fuel pump to run with the fuel pump relay removed and a jumper wire installed between terminals 30 and 87 of the fuel pump relay socket (page 234-4 in the Bentley 8V manual). It could be a dud fuel pump relay, even though you say you're getting +12V in places which appear to be coming from the the fuel pump relay, or it could be terminals might have come loose under the fuse/relay panel. >Car cranks over, gets spark, gets NO fuel pressure. Car just stopped >running in the middle of the street. It could also be that the supply pump has failed. The main fuel pump can still be fine, but if the supply pump doesn't work the main pump won't be primed. Page 234-5 in the Bentley 8V manual details how to test the supply pump. Regards, Craig. -- Craig's Saab C900 Page --> http://nospam/~c900 Sydney, NSW Australia Craig's Saab C900 Workshop -- For all Saab C900 Enthusiasts world-wide! http://www.nospam.net http://www.nospam c900nospam.apana.org.au Come and explore our site, and check out our web-forums, mailing list, etc.
 |
 |
 |
 |
 |
