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It should be behind the glove box in an access panel.
where is the relay located on a 87 lesabre
In a 1987 Park Avenue the fuse panel is located under the dash panel where the headlight switch is. There are two finger screws on the left side of the dash by the door, turn these left to release, then pull the panel off. I am not wholly certain, but in the 1992 Park Avenue I have it is located on the left side abouta foot in from the door. There are also other fuses located on the RIGHT side of the dash under the sound insulator.
inside the gas tank
700 RPM
Maybe on the passenger side near the firewall
Check firing order
It is with all of the relays in the center of the firewall under the hood.
On the transmission under the shifter cable bracket
Fuse panel. Open and read your owner's manual.
over top of fuse panel you will see or feel the relays.the top row second relay is your fuel pump relay
1-6-5-4-3-2