SOURCE: 1994 buick regal
More than likely (and we will hope) it is the oil sending unit. In comparison it is a very cheap and quick fix to replacing the oil pump. Auto Zone has a pretty good componet location section that has tips for replacement if you cant find the sending unit or the oil pump. Try that first it may save you a lot of work.
SOURCE: replacing power steering pump in a 95 buick regal
i think you need to remove pully first it is a special puller gm has
SOURCE: buick regal 92 3.8L Horrible fuel mileage
Sounds like you might have an oxygen sensor problem. Your catalytic converter(s) maybe defective or dirty. That in turn can dirty up the oxygen sensor. A defective oxygen sensor will send faulty info to the computer, interpreting the fumes as cold (even when the engine warms up). That causes the computer to adjust the fuel mixture to very rich, giving you poor gas mileage and the fuel smell. Hope it helps.
SOURCE: 91 buick regal 3.1 replace the crank sensor the
replace the ignition module,under the coil pack.
SOURCE: p0440 Service Engine Soon light
Here are some possible causes and fixes http://www.obd-codes.com/p0440
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