roachey

I am going to be changing my fuel filter tomorrow on a 1990 f150 5.0l and I was wondering what steps I should take to do this. I have read to depressurize your whole fuel system. Some say to leave it sitting over night and others say to disconnect your fuel pump relay. So where is my fuel pump relay located if I have to disconnect it? And also is there any other things I should do before disconnecting my fuel lines?

qdeezie

The main thing I've gathered from changing mine over the years is to use the same wide drain pan you use to drain oil in to allow the gas to drain in. I don't do the overnight thing or disconnect anything.

sylver91

Disconnecting the fuel pump relay is the easiest way. The relay is in the under hood fuse panel, second from the fender. Pull that and crank the truck till it dies, I also loosen the fuel tank caps to release any vapour pressure inside of the tank. Then get some penetrating lubricant, rust freeze or something similar and spray inside the lines around the filter cause its certain there is gonna be crud in there.

After the lines have soaked for a bit twist the filter around and slide the lines back and forth to free them up, then use you're filter tool and insert then in the line. You have to push the line towards the filter at the same time as you push the tool inside the line to unhook it, twisting it a bit usually frees it up.

Be sure to have you're catch pan ready, that filter hold quite a bit of fuel in it as well as the residual fuel in the line. Once you get the filter out, stick in the new one, put the fuel pump relay back in and cycle the key a few times to get the fuel back to the engine then start it up.

Personally I like using the plastic disconnect tool, as its a little easier to insert inside the line and I get a better grip using my fingers.

Warlockk

I don do anything special. Just don't do it right after running the engine and use a catch pan and some rags.