Question about 1995 Cadillac DeVille

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How do I empty gas tank on a 6 deville? - 1995 Cadillac DeVille

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I assume that you need to change the fuel pump. Before you do this loosen the gas cap and try to run the car. Cadillac and other new cars have a vacuum pump to pull vapors back to the engine. If that pump does not work the tank builds up a vacuum and the car will not KEEP running on the road. It could be the vaccum pump and not the fuel pump---Check the fuel pressure at the fuel rail. If you determine that the fuel pump is, indeed, the culprit; it is possible that the fuel can be sucked past the fuel pump. To do this; determine which is the line running to the fuel rails--it is about 5/16 " diameter/Black in color.

If you plan to cut this line to apply suction/pump--have a repair plan in place as these lines are NOT available even from Salvage yards.

Simple hose and clamps will not do it--they blow off on the road.

Glue---Sections of tight fitting over fitting hose and more glue---clamps--retaining wire---do it all !!!.

The tank can be dropped with a floor jack in the center of the tank---disconnect the holding straps from the back of the car--the tank will drop at the front enough to disconnect the various hoses from the pump/guages .--The fuel pump can be removed this way without taking the plastic fuel tank completely out or the gas out of the tank--------The front of the tank will slide down the straps and push to the back allowing work to be done. Get the car off the ground about 18 inches. DO NOT use and incandescant bulb for light as it can ignite gas fumes---Be concerned !!!

When you work on this problem---match mark everything including the hose routing to the tank--you might think that you will remember---but pulling th tank down again to reposition a hose route is a pain--been there---done that !!--best to use spray paint for hose routes. Be sure to mark the hose ends that go closest to the tank.

Be sure not to bend the float assembly when removing the pump. The fuel guage will be affected.

At the back of the tank/top there is a wiring harness that needs to be unplugged---do it. Do it first.

I hope this helps--Rick

Posted on Dec 18, 2008


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