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Stupid Fuel Filter Tricks from the Volvo manual that didn't work. 200 1991

I wanted to change my fuel filter. Manual says "depressurize" the system before doing so. Okay. I pulled the fuel pump fuse, cranked the car, and waited for the motor to quit. The manual says it will quit. The motor didn't quit. Garage filled with Carbon Monoxide. Waited and waited. Eight minutes later, me and the dog are nearly dead. Motor still didn't die. Finally I shut it down. Then I noticed a second fuse, I think this was for fuel injection. Pulled that. Motor didn't start at all. So the question is this:

1. Why am I not dead?
2. Should I bother de-pressurizing the line at all? If so, how to do it.
2. Should I change the fuel pump while I'm down there? I can hear something buzzing from the trunk of the car when the motor's running. I'm told that's normal. Is it? This thing is a pain to get to because that platform that the fuel filter and pump live on, the back bolt of that platform is fastened to a long arm that needs to be held steady with vise grips or something to keep it from twisting off due to age as I loosen the bottom bolt.

Thanks for your help.

Cuddy






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