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Fuel Pumps (long but thourough)
Posted by BrettH (more from BrettH) on Tue, 28 Feb 2012 15:48:56
My Saab saga continues...

My car died on the interstate last Monday, the day before I was going to order a new tripod bearing and inner driver. I had it towed to a import/domestic shop that a friend has used for 15 years because I do not know a Saab indi after recently moving to Cleveland, I know, first mistake.

They immediately replaced the fuel filter with one that would be $250 + tax and labor and called me to tell they got a bad one and needed to put in a $450 pump. A red flag went up and I paid them for the labor that they already put into the car, then had that same friend tow the car late at night with his pickup to his house less than a mile away. I bought my own pump and the car ran long enough to put on my seat belt and reset the radio code before it died again.

I have used the Bentley manual to check relays and the electrical circuit leading to the pump, also reading Saabnet lead me to clean the grounds. There is continuity from the pump to the ground and 9.5 volts to the pump when cranking the engine. (Bentley says that it only sends power to the pump while the engine is physically moving to prevent it pumping if the car stalls) I am assuming the voltage drop is due to the starter running at the same time.

I also used some wire to connect the pump directly to the battery outside the car and nothing happened. My Saab indi in Florida suggested it.

I don't think I had 2 bad brand new pumps in a row. Could the car be frying them? Is only 9.5 volts to the pump normal while the starter is turning the engine?

Saabnet has kept 4 Saabs in my family since 2000 and I am completely stumped this time.

Thank you for your help
BrettH
1992 900 2.1L 5spd hatch

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