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When you turn the key on the fuel pump should pump for about five to ten seconds. Do this a few times and it should start. Even with a full tank the pump will do this to pressurize the system. If the pump keeps running it's not picking up fuel. Have a friend listen at the gas cap with the cap removed for the pump to cycle. If it doesn't work there is a fitting on the fuel rail that looks like a valve on a tire. Take the cap off of it and use a small screwdriver to push the center in and see if there is pressure in the fuel rail. Have the key on and wear safety glasses.You should get a squirt of fuel out of it. If you have no pressure there the pump could be bad or the filter plugged. If there is pressure you have other problems. There is no shut off switch. Only fuses and a fuel pump relay. https://www.google.com/search?client=ms-android-samsung&source=android-browser&ei=_skGWP71NoOFmwGwvp-YCw&q=1998+buick+lesabre+fuel+pump+switch+location&oq=+1998+Buick+le+sabre+fuel+pump+switch+location&gs_l=mobile-gws-serp.1.0.30i10k1.20246.66235.0.71699.52.41.2.0.0.0.354.6560.4j26j8j2.40.0....0...1.1.64.mobile-gws-serp..17.35.5853...0i10k1j0i7i10i30k1j0i13k1j33i21k1j33i160k1.pAvwOOuWlKU#imgrc=99du9RTFFGCYhM%3A&scso=uid_WAbKSQAIdFcKJtQCGQCAqw_8:0
A "fuel pump reset switch" is a Ford thing! You need to check for 12 volts at the sender connector.If you have it,the pump is probably bad(in the tank)
Only Ford products have an inertia switch. If the pump does not work, you would need to check for voltage at the pump relay and the connector at the gas tank.
The fuel pump is located in the fuel tank, but your in luck!
If you remove the carpet from the trunk you should see an access pannel way in the back almost hear the back of the rear set. Remove the access pannel and you see the top of the fuel pump underneath.
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We are assuming that you are talking about Fuel Pump Relay; so, take the plastic cover off the Power Distribution Center. There may be a plastic tab retaining the cover, depending on the model LeSabre you have. With the cover removed, stand before the power distribution center so that the square relays within it visually appear horizontal.
Locate the fuel pump relay in the lineup of relays within the power distribution center. If you're looking at the relays from the correct position, you should see two horizontal rows of five. Count from the right over to the third relay in the top row. This is your LeSabre's rear defogger relay; directly below it is the fuel pump relay. Disconnected and connected again to electrical reset it.
Additionally, this video could be helpful,93 Buick Lesabre fuel pump relay location...
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