It is in front of the drivers side rear wheel. To get to it, you must get the car up, (on a ramp or something), it is connected by a hose (with a clamp) and a nut. There also is a bracket to hold it. Once you get the car up, its not all that difficult to change.
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Often as not the fuel filter is along the inside frame rail under or just aft of the rear door. That's where it was on 1990. I don't know your car specifically but that's where I'd look first. And definitely skip the Haynes for a Cadillac. I've used them on normal cars and they're barely passable but if you want to open up a Cadillac FSM is the only way to go.
FUEL INJECTED ENGINES
The fuel filter on fuel injected vehicles may be located in one of two locations. On all 1976–79 vehicles except the Seville, the filter is mounted in the engine compartment near the fuel pump. On the 1976–79 Seville, and all 1980–85 vehicles, the fuel filter is located on the left side of the chassis just ahead of the rear axle. On 1986–89 vehicles, the filter can be found near the frame, in back of the left front wheel. There are two types of fuel filters used on the gasoline fuel injected vehicles, the one-piece disposable inline filter, used on all 1982–86 250 and 1988–89 273 V8 engines, and the replaceable element type filter used on all the other engines.
CAUTION Fuel is under high pressure: if the steps below are not followed, the fuel could spray out and result in a fire hazard and possible injury.
Disconnect the negative battery terminal.
Release the pressure from the fuel system:
Without pressure fitting: Cars without a pressure fitting in the fuel line, cover the fitting to be removed with a shop towel while loosening so that fuel will be absorbed. Dispose of gasoline properly.
With pressure fitting: Locate the pressure fitting in the fuel line and remove the protective cap. Loosely install a special valve depressor (G.M. tool no. J-5420) on the fitting. Wrap a towel around the fitting to block any spray and slowly tighten the tool until the pressure has been relieved.
Replace the filter as follows:
On the replaceable element type filter; the fuel filter element is replaced by unscrewing the bottom cover and removing the filter element. Replace the element and gasket with an AC type GF 157 or equivalent. Hand tighten the bottom cover.
On the in-line disposable type filter; the fuel filter canister is replaced by loosening the fitting on the end of the filter, then use a pair of pliers to expand the clamp on the other end and slide it down past the point where the hose extends over the inlet of the filter. Gently twist and remove the hose, unscrew and remove the fitting. Remove and discard the old filter. Install the new filter into the hose and replace the clamp. Reinstall the fitting, and check for leaks with the engine idling.
NOTE: A dry fuel system on cars equipped with EFI/DFI may require a substantial cranking period before starting. Be sure to crank the engine in short bursts, allowing time for the starter motor to cool between each burst.
Fig. 1: Fuel filter location, disposable type — 1986–87 8-250 and 1988–89 8-273 engines
Fig. 2: Fuel filter location, sealed type — 8-250 and 8-273 engines
Fig. 3: Common fuel filter location — lower right corner
Fig. 4: Removing the fuel filter hose clamp
Fig. 5: Removing fuel filter lines — always use a back-up wrench
Fig. 6: Removing fuel filter mounting