relieving fuel pressure

RangerLuc · #1 12-02-2009, 01:16 PM

i just picked up a new fuel filter and i read in my chilton book that you have to properly relieve the pressure before you can change the filter. it describes a fuel pressure switch? i dont know where this is. how do you relieve the pressure?

mcpink · #2 12-02-2009, 01:46 PM

Fuel pump cut-off switch is located in the passenger foot well, behind the kick-panel.

RangerLuc · #3 12-02-2009, 02:01 PM

Quote:

Originally Posted by mcpink

Fuel pump cut-off switch is located in the passenger foot well, behind the kick-panel.

so i just take the kick panel off? then flick the switch off and that relieves the pressure?

Johnbaum13 · #4 12-02-2009, 02:03 PM

Thats the inertia cut off. To trigger that you would have to smack it with a hammer.

It's much easier to just pull the fuel pump fuse while the engine is running. The truck will then run out the excess pressure in the line, ready for the filter to be changed.

Another way to be sure the pressure is relieved, is on most trucks, there is a shrader valve on the fuel rail. Just depress that AFTER relieving the pressure, to double check that all the pressure is out of the system.

The filter will still leak fuel, even with no pressure, but it beats the heck out of getting sprayed!

RangerLuc · #5 12-02-2009, 02:06 PM

Quote:

Originally Posted by Johnbaum13

Thats the inertia cut off. To trigger that you would have to smack it with a hammer.

It's much easier to just pull the fuel pump fuse while the engine is running. The truck will then run out the excess pressure in the line, ready for the filter to be changed.

Another way to be sure the pressure is relieved, is on most trucks, there is a shrader valve on the fuel rail. Just depress that AFTER relieving the pressure, to double check that all the pressure is out of the system.

The filter will still leak fuel, even with no pressure, but it beats the heck out of getting sprayed!

do you know which fuse it is? and once i pull it do i let it run until it shuts off or something?

Johnbaum13 · #6 12-02-2009, 02:10 PM

Not sure which fuse it is on yours, but it should be listed in the owners manual. And yeah, it'll only run for a second before it's out of fuel.

Edit: Just looked up your owners manual, and it's fuse #23 in the fuse box under the hood. It will be a 20a fuse.

RangerLuc · #7 12-02-2009, 02:23 PM

Quote:

Originally Posted by Johnbaum13

Not sure which fuse it is on yours, but it should be listed in the owners manual. And yeah, it'll only run for a second before it's out of fuel.

Edit: Just looked up your owners manual, and it's fuse #23 in the fuse box under the hood. It will be a 20a fuse.

ok cool i appreciate the help.

Fx4wannabe01 · #8 12-02-2009, 05:38 PM

Yeah...

either pull the fuse and let it run til it dies. Or pull off the blue cap on the back of the fuel rail and push the valve. Alot like a tire valve stem. Same thing but on a fuel rail.