Question about Mercury Grand Marquis
I can tell you several things and will add a few things because I do not know why you want to drain the tank.
A Part called an Inertia switch will interrupt the power to the fuel pump if it is tripped. It has a Reset button and depending on your Year Grand Marquis, the part is in the trunk next to the Air suspension. Your pump may be good.
Clogged fuel pump. There is a plastic screen which is on the fuel pump pick-up. It can disintegrate and clog the pump. Blow air into the fuel rail test port to shed the screen fragments back into the tank. Then try the next paragraph.
Working pump with Low pressure. You can remove 2 things to pump out the gas.through the fuel rail. The test port on the fuel rail has a valve similar to an air valve stem. Removal of the valve seat from the test port allows you an open line to drain the tank.
Go on the internet and find the procedures for jumping the fuel pump relay switch. The relay is in a black box which is piggy-backed on a Powerbox on the Drivers side of the engine compartment. The top of the piggy-back has 3 relays and a diode labeled and the trio slide out of the compartment by releasing some retaining snaps protruding out of the case.
If you look under the relay there will be numbers by the contacts. I want to say that #27 and #34 are the two to be jumped. I may have the wrong numbers or your Year car may be different.
One pin is a power source-the other goes directly to the fuel pump. With the ignition ON, placing a wire between these two contact holes will power your fuel pump.
Have a hose clamped on the fuel rail test port which you removed the needle seat from and put the hose end into a gas can.
I pumped close to 17 gallons of fuel from my 2002 Grand Marquis in a short time.
The gas tanks have baffles. I tried 3 different hose sizes and could not get one to pass the baffles. The fuel filter disconnect can be a problem, especially with fuel pressure. So the easiest way to drain the fuel is through the test port.
You can also siphon through the port with a hand drawn pump.
Please rate my info.
Posted on May 05, 2013
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Posted on Jan 02, 2017
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