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How do you change the fuel pump in a 1986 Cadillac Sedan DeVille?
Wiki User
∙ 8y ago
you have to drop the fuel tank and it is going to be a pain
That answer is correct but perhaps I can expand:
1. Disconnect the negative battery cable.
2. Jack up the car, front and back and get it at least 24 to 30 inches up and on
jackstands, basically the higher the better up to about 30 inches.
3. Siphon all the fuel from the tank. You will have to remove the filler hose and
air vent hose from the tank and the gas filler compartment, hoping that the fuel level
is below that lever. If the tank is over 1/3 full be prepared to have a vessel underneath the filler hose to tank connection to receive the gas which will pour out when you remove the large hose. Have a fire extinguisher and a garden hose ready
in case you somehow ignite things....no smoking or hot lamps nearby !!!
You can't just run a hose down the filler neck and siphon out the gas because there is an obstruction about 3 inches into the gas tank and without removing the filler hose you just can't get the siphon hose aligned to pass thru the obstruction, a circle opening about 1 inch in diameter. You have to remove both of these hoses anyway to drop the tank and you will need to detach them from the upper connection at the gas filler cap assembly to get sufficient movement to detach them form the tank.
There is also a hose to frame clamp securing them in the driver side rear wheel well.
With the gas drained/siphoned you can remove the three rubber hoses connecting the steel pipes coming down from across the top of the tank and joining to the fuel filter and return and vent pipes running along the chassis.
At this point you need to support the tank with a tranny jack or floor jack and
remove the supporting straps ( two ) and begin to lower the tank. On some models you will also have to remove the rear portion of the exhaust system. When the tank
is lowered about 12 inches you can disconnet the wiring harness on the top of the tank that connects to the fuel pump assembly. Lower the tank the rest of the way
and remove it from under the car...remember, even "empty" this tank is a waiting bomb if you expose it to fire or sparks. JHSills
Wiki User
∙ 8y ago
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Usually in or near the fuse block by steering column
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Do you have a diagram of 1986 cadillac coupe deville distributor cap?
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Does any one have a 1986 Cadillac deville wiring schematic?
yes, I do
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5x115 Center bore should be 70.3
Do you have to drop the gas tank on a 1986 Cadillac Coupe Deville to replace the fuel pump?
Yes
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http://www.nadaguides.com/Classic-Cars
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Try Hemmings Classic Cars or Hemmings Motor News
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Theres no real answer to that question. First of all I would remove the glove box and the stereo unit. Then search for the other bolts by eye. Its a very difficult job to do... If you can't do it, you should seek perfessional help. It can be done alone, but it is very time consuming.
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Mink DeVille ended in 1986.
Why would the heater motor continue to run on a 1986 Cadillac deville when the car is off?
the fan has a high amp draw roasting the control module replace them both!!
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On the starter. It's actually a PART of the starter. If it's not engaging at all, (no click) it could be the keyswitch, a dirty or loose connection or the neutral lockout switch.
