1990 stang, replacing fuel filter questions? - Ford Mustang Forum
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post #1 of 7 (permalink) Old 02-15-2009 Thread Starter
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1990 stang, replacing fuel filter questions?

Hi everyone I tried to look through all the other posts and threads but didn’t find the answers so...... what I would like to know is how to depressurize my fuel system and replace my fuel filter.
What I’m asking is how do you depressurize and pressurize the fuel system and how do you stop the flow of fuel from the fuel lines when you remove the fuel filter ?
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post #2 of 7 (permalink) Old 02-15-2009
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i was told to remove the fuel pump relay while running though it doesnt always work out as well as i hope
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post #3 of 7 (permalink) Old 02-16-2009
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Just unplug the filter and replace. If your really worried about it, it should bleed off after siting for a few days or you could push in the schrader valve to release the pressure. Dont do it while the engine is hot.
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post #4 of 7 (permalink) Old 02-16-2009
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1. Jack up car and place jack stands

2. Disconnect the fuel inertia switch that is located in the trunk. This switch cuts off fuel

3. Next find the Schrader valve that is located by the throttle body, which is located at the end of the fuel rail towards the front of the car. It looks like a tire valve.

4. Once the Schrader valve is located unscrew the cap of the Schrader valve and use a small screwdriver or something to release the fuel pressure. This is much like letting air out of a tire....just press down and it will release the pressure. I would recommend wrapping a shop rag or towell around the Schrader valve and whatever you use to release the pressure. Gas will shoot up, not a lot, but enough.

5. Once you have the inertia switch unplugged and fuel pressure relieved start the car and let it idle until there is no more fuel getting to through the lines, which will cause the car to die on it's own and should minimize the amount of fuel that is released when changing the filter.

6. Next unplug the battery. I didn't do this, but my car threw a code after unplugging the inertia switch and used my predator to clear it. I think unplugging the battery will reset the computer after plugging the inertia switch back in when finished.

7. Get under the car and locate the fuel filter, which is right behind the gas tank.

8. Unscrew and remove the clamp.

9. Pry the fuel filter out of the the housing, which will give you a little room to work with.

10. Then take the 5/16 fuel line disconnect tool and slide in on the fuel line and move it to the outside (away from the fuel filter).

11. Once you get the fuel line disconnect tool slid all the way in, then pull the fuel line off the filter. A little bit of gas will come out so have something on the ground to soak it up.....I used some cardboard that I had left over from moving. I would also suggest goggles so fuel can't get into your eyes. Not a lot of fuel came out when I did this, but you never know.

12. Re-connect the fuel lines to the filter, but make sure the arrow on the filter is pointing toward the engine side of the fuel line.

13. Slide the filter back into the housing and put the clamp around the filter.

14. Re-connect the inertia switch

15. Re-connect the battery

16. Make sure to put the Schrader cap back on.

17. Put the key in the ignition and turn it to the on position and leave it for a few second, but do not start the car. Do that a few time to allow fuel pressure to build back up.

18. Check for any leaks.

19. Start the car and your done
post #5 of 7 (permalink) Old 02-16-2009
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i just pull hoses off, take out, replace, reconnect hoses, then start, and if that much fuel is actually missing from the line that spills out, it will just stall the same as it would as if you ran out of gas, then just roll it over again and itll be fully pressurized!

i'm replacing mine tomorrow

no real need for all that extra habubaloo if it stalls, it stalls just start her up again no harm in that

*1994 Mustang GT Laser Red w/ White Stripes -
GT40P heads, Cobra Upper & Lower Intake w/ 1/2 Spacer, Ford Racing Ceramic Coated Shorties, 2.25" Exhaust No cats, Flowmaster 40s, 3.5" Stainless Steel Tips, Ford Racing 3.73's, K&N CAI, EdelBrock Chrome Valve Covers, 17" Silver Cobra R rims, Brembo Rotors, 94' Cobra Calipers!
*1982 GMC High Sierra6.2l Diesel 4X4-
Custom CAI, Custom 4" Stainless Steel Stacks, 4:56 Posi, Dana 44 F, Dana 70 R, 15" Bullethole Rims, 33"

BFG's, A.K.A Big RED
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post #6 of 7 (permalink) Old 02-16-2009
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Yea, no need to depressurize the lines. Unless you do not want to make a mess. Just be careful when removing the lines from the filter, gas is not something fun to get in your eyes.
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post #7 of 7 (permalink) Old 02-16-2009
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I loosen the gas cap to let out any built up pressure and then put it back on. I found that sticking some vacuum caps on the Filter itself keeps you from getting fuel running down your arms!
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