1993 fuel filter change
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Freshman User
Joined: Nov 2005
Posts: 38
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From: Upstate NY
1993 fuel filter change
I am helping a friend with replacing a fuel filter on a 1993 f-150 gas engine straight 6 truck. Someone said I had to depressurise the system before I remove it. How is this done? Also anyone have any tips on doing this? I guess the filter is on the drivers side inside of the frame rail? 
Thanks
Thanks
FTE Legend
Joined: May 2008
Posts: 56,542
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From: In my own world
ther is a schrader valve [ looks like a tire valve] on the fuel rail, passenger side near the fire wall.remove the cap, and take a small screwdriver, and depress it, watch for fuel spray.could get you in the eyes. there is a special tool needed, you can get in the help dept of your parts supplier. you insert the tool, and press in on the line, then gently tug it off, on both ends. there is still fuel in the filter, so be careful. make sure you have the proper filter, as old style is too short, and if you put that one in, you will never get back off. the filter is held in place with a hose clamp. remove the filter, make sure you have the arrow in the right direction, simply push the lines back on until they click, and tighten the hose clamp
Elder User
Joined: Feb 2008
Posts: 721
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From: Four Corners, MT
Hey man, I just did this on my truck.
You are going to need a 5/16's fuel line removal tool to do it.
De-pressurize the system using the schrader valve.
Then go back and remove the two 10mm nuts that hold the fuel filter clamp in place on the outside of the frame rail.
Next, squirt some brake cleaner up in and around the fittings and try to wash them off/out as good as you can.
Insert the 5/16" tool into the fitting and wiggle, pry, and push it back until it's flush with the fitting. Then try and seperate the lines from the filter.
Once they're both off wash out the fittings if they're dirty and use a small pick to get any big particles out.
Then put the new filter into the clamp with the arrow pointing towards the front of the truck.
Re-attach filter and re-connect fuel lines.
Hope that helps!
You are going to need a 5/16's fuel line removal tool to do it.
De-pressurize the system using the schrader valve.
Then go back and remove the two 10mm nuts that hold the fuel filter clamp in place on the outside of the frame rail.
Next, squirt some brake cleaner up in and around the fittings and try to wash them off/out as good as you can.
Insert the 5/16" tool into the fitting and wiggle, pry, and push it back until it's flush with the fitting. Then try and seperate the lines from the filter.
Once they're both off wash out the fittings if they're dirty and use a small pick to get any big particles out.
Then put the new filter into the clamp with the arrow pointing towards the front of the truck.
Re-attach filter and re-connect fuel lines.
Hope that helps!
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Junior User
Joined: Mar 2009
Posts: 89
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From: tacoma wa
wow this is alot more involved then i did mine although the shower of gas wasnt to fun...i just took the lines off w/o depressurizeing the lines
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Posting Guru
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I imagine the shower of gas was a ton of fun. You also run the risk of burning alive from a small spark when doing this! I would not do it again. There were two good ways to relieve pressure mentioned in this thread: removing the pump relay and trying to start the motor, and flipping the inertia switch and running it out of gas as TNT1968 said. A third way is to bleed off the pressure using a fuel pressure gauge.
Using a screwdriver and letting a shower of gas go all over the engine compartment is not the best idea either. Anything method that lets gas (a volatile and extremely flammable liquid) out of the fuel system at high pressure in an uncontrolled manner is not advisable.
Using a screwdriver and letting a shower of gas go all over the engine compartment is not the best idea either. Anything method that lets gas (a volatile and extremely flammable liquid) out of the fuel system at high pressure in an uncontrolled manner is not advisable.
Senior User
Joined: Oct 2008
Posts: 264
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From: Rockwall TX
theres no need to relieve the pressure ive probably done a hundred fuel filters and never relieved the pressure and nothing has ever happened even when the guy next to me is smoking. just watch out for gas
Posting Guru
Joined: Feb 2007
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Yeah, you get a bit of gas coming out of the lines when the pressure has been removed, I bet it was real fun with the line pressurized. I used to smoke and hated doing fuel system work because I couldn't have a cigarette while I was doing it.
1959_f100: Why take the risk with the pressurized line? Its not like its a big job to relieve the pressure. I could say that it is not neccessary to wear a seatbelt when riding in a car. If I had never used one in my life, I would still be here, but there is always the chance...
1959_f100: Why take the risk with the pressurized line? Its not like its a big job to relieve the pressure. I could say that it is not neccessary to wear a seatbelt when riding in a car. If I had never used one in my life, I would still be here, but there is always the chance...
Junior User
Joined: Mar 2009
Posts: 89
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From: tacoma wa
yah i dont smoke but i do chew...i to hate working on gas lines or solvent tanks because it gets on my hands and then when i put a chew in i can tast gas for like 30 min it kinda sucks but hey ill just rember to wear gloves next time
Posting Guru
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Those are the best tasting dips aren't they? I hate it when you throw a dip in and it tastes like whatever you are working on. I once ruined most of a can of cope when I was replacing fuel injector o-rings on the Explorer in my sig. Every dip I took out of that can after I finished that project tasted like gas. If it were not for the fact that I had paid $7 for the can I would have thrown it away.