Do i really need a fuel pressure gauge to relieve gas pressure in the fuel lines in order to install a new filter??? I just want to put it in already without having to wait to buy this damn thing.

 

I removed the gas cap to relieve the tank pressure and then let the car sit for a couple hours and i had only minor spills. A gauge is only useful if the line is under pressure and since the system drains after time you have very little if any.

 

Who said you needed one? http://shbox.com/1/fuel_filter.html

 

You would use the fuel pressure gauge more or less to test the integrity of the fuel system, not to do a maintenance repair of a fuel filter swap. I just uncapped the gas cap to relieve the pressure. Otherwise, when you break the lines to get the fuel filter off, you will be taking a bath in gas.

 

Removing only the gas cap only, does not relieve pressure in the lines. If it has been sitting for a while there may be little pressure left in the lines, anyway. Mine will still have some pressure 12 hrs or more after the engine is turned off.